Chandra Cycle 6 Science Programs

*********************************************************************************** SOLAR SYSTEM -------------------------------------------------- =================================================================================== Proposal Number: 06100312 Proposal Title: Comet 9P/Tempel 1 During the Deep Impact Encounter PI: Carey Lisse Subject Category: SOLAR SYSTEM Abstract: We propose a series of observations of the periodic comet 9P/Tempel 1 in conjunction with NASA's Deep Impact mission. This mission is a spacecraft that will release a 370 kg impactor into the nucleus of the comet on July 4, 2005 at high relative velocity. Our primary objective is to study the generation of prompt x-rays in the impact plume and the change in charge exchange created x-rays as the impact ejecta propgates through the neutral coma. To this end we plan to obtain ACIS-S imaging spectroscopy before, during, and following the impact. Grat- Exp. R.A. Dec. (J2000) Target Name Det. ing Time ----------------------------------------------------------------------------------- 9P/Tempel 1 ACIS-S NONE 25.00 9P/Tempel 1 ACIS-S NONE 25.00 9P/Tempel 1 ACIS-S NONE 25.00 9P/Tempel 1 ACIS-S NONE 25.00 9P/Tempel 1 ACIS-S NONE 50.00 9P/Tempel 1 ACIS-S NONE 150.00

*********************************************************************************** STARS AND WD -------------------------------------------------- =================================================================================== Proposal Number: 06200016 Proposal Title: Star formation in the young star cluster NGC 6231 PI: Stephen Murray Subject Category: STARS AND WD Abstract: A 100 ksec ACIS-I observation of the very young star cluster NGC 6231 will probe a suspected strong deficit of low-mass stars in this cluster. For a cluster of the age and distance of NGC 6231, Chandra X-ray observations are uniquely suited to efficiently select low-mass pre-main-sequence members that are virtually unidentifiable by any other means. Finding the low-mass cluster population will have strong implications for our knowledge of different aspects of the stellar formation process, from the initial mass function to mass segregation, and from star formation history and sequential star formation to star formation efficiency. The proposed observation can test definitely whether or not star formation in NGC 6231 has been peculiar, i.e., in yielding very few low-mass stars. Grat- Exp. R.A. Dec. (J2000) Target Name Det. ing Time ----------------------------------------------------------------------------------- 16:54:14.20 -41:49:36.50 NGC 6231 ACIS-I NONE 90.00 =================================================================================== Proposal Number: 06200050 Proposal Title: Alternate: A Search for X-ray Activity from a Mass-Accreting Young Massive Star in NGC7538 with ACIS-I PI: Gordon Garmire Subject Category: STARS AND WD Abstract: Using ACIS-I, we propose to observe a Galactic HII region (NGC7538) in search for X-ray activities from an unambiguous sample of massive young stars in the mass accretion phase. By comparing its X-ray features with those of massive ZAMS stars and low-mass pre--main-sequence stars, we will investigate the X-ray emission mechanism of massive young stars and how much contribution they make to the diffuse X-ray emission of HII regions and to the Galactic ridge emission. Grat- Exp. R.A. Dec. (J2000) Target Name Det. ing Time ----------------------------------------------------------------------------------- 23:13:45.00 +61:28:09.00 NGC7538 ACIS-I NONE 30.00 =================================================================================== Proposal Number: 06200059 Proposal Title: Search for beta Pic analogs PI: Gordon Garmire Subject Category: STARS AND WD Abstract: The nearby star beta Pic, prototype for intermediate-mass stars with dusty disks associated with planet formation, has recently been shown to be part of a kinematical moving group associated with the very young Oph-Sco-Cen OB association. This continues our ACIS snapshot program directed at other nearby intermediate-mass stars with similar kinematical properties. Grat- Exp. R.A. Dec. (J2000) Target Name Det. ing Time ----------------------------------------------------------------------------------- 03:11:56.20 +74:23:38.00 HR 932 ACIS-I NONE 3.00 05:13:25.70 +38:29:05.00 mu Aur ACIS-I NONE 3.00 05:39:31.50 -03:33:53.00 HR 1940 ACIS-I NONE 3.00 09:08:52.40 +51:36:17.00 f UMa ACIS-I NONE 3.00 10:43:02.00 +26:19:32.00 40 LMi ACIS-I NONE 3.00 12:35:45.60 -41:01:19.00 HR 4794 ACIS-I NONE 3.00 21:24:11.40 -12:52:41.00 18 Aqr ACIS-I NONE 3.00 =================================================================================== Proposal Number: 06200079 Proposal Title: X-ray emission from fast moving shocks in the protostellar jet HH 154: a binding diagnostic of the emission mechanism PI: Fabio Favata Subject Category: STARS AND WD Abstract: We propose to determine the proper motion of the X-ray source associated with HH 154, the only known protostellar jet in which the X-ray emission mechanism can be studied in detail. Our numerical simulations indicate that the X-rays are produced in a fast-moving (500 km/s) post-shock region, and our HST observations show high proper motion shocked material moving at similar speed. Detection (or lack of) of proper motion of the X-ray source will strongly confirm (or falsify) our model, and constitute the basis for a general theory of X-ray emission in protostellar jets. Understanding and modeling the emission mechanism is key to assess the lifetime of the X-ray emission and thus the influence of X-ray from protostellar jets on the star (and planetary) formation process in general. Grat- Exp. R.A. Dec. (J2000) Target Name Det. ing Time ----------------------------------------------------------------------------------- 04:31:32.70 +18:08:08.00 HH 154 ACIS-I NONE 100.00 =================================================================================== Proposal Number: 06200093 Proposal Title: X-ray Imaging of McNeil's Star: Witnessing the Onset of an Accretion Burst PI: Joel Kastner Subject Category: STARS AND WD Abstract: It is widely accepted that most if not all Sunlike stars experience one or more FU Ori (FUor) phases - episodes of exceedingly high accretion rate - during their pre-main-sequence evolution. However, no FUor has yet been studied during outburst onset. We propose to monitor the X-ray luminosity and spectral distribution of McNeil's Star, a candidate FUor recently (Jan. 2004) caught during its rise phase. As McNeil's Star was serendipitously detected as a weak X-ray source by CXO prior to outburst, the proposed monitoring campaign will constitute a unique test of the hypothesis that accretion processes are responsible for X-ray emission from pre-MS stars. This opportunity is unlikely to repeated during Chandra's lifetime. Grat- Exp. R.A. Dec. (J2000) Target Name Det. ing Time ----------------------------------------------------------------------------------- 05:46:13.10 -00:06:05.00 IRAS05436-0007 ACIS-I NONE 20.00 05:46:13.10 -00:06:05.00 IRAS05436-0007 ACIS-I NONE 20.00 05:46:13.10 -00:06:05.00 IRAS05436-0007 ACIS-I NONE 20.00 =================================================================================== Proposal Number: 06200153 Proposal Title: The puzzle of X-ray emission from magnetic stars without convective envelopes PI: J\"urgen Schmitt Subject Category: STARS AND WD Abstract: X-ray emission is ubiquitously found for hot and cool stars in the HR-diagram. The X-ray emission from hot stars is thought to be related to radiative wind instabilities, that of cool stars to magnetic activity, produced by the dynamo mechanism in the outer convection zones. B/A-tye stars without winds and outer convection zones should then be devoid of X-ray emission, yet one does find some percentage of those stars as X-ray emitters. This X-ray emission is conventionally attributed to low-mass companions.We show that the stars HD66318 and HD215441 with extremely large magnetic fields (> 10kG) are X-ray sources and suspect that all B/A-type stars with sufficiently strong field are X-ray emitters. We thus propose to carry out a survey of B/A-type with very strong measured magnetic fields. Grat- Exp. R.A. Dec. (J2000) Target Name Det. ing Time ----------------------------------------------------------------------------------- 02:04:29.40 -29:17:48.50 HD 12767 ACIS-S NONE 3.00 02:26:00.30 -15:20:28.50 HD 15144 ACIS-S NONE 3.00 16:01:58.90 -37:32:03.70 HD 143473 ACIS-S NONE 15.00 16:06:06.40 -23:36:22.70 HD 144334 ACIS-S NONE 3.00 16:14:53.40 -25:28:37.10 HD 146001 ACIS-S NONE 3.00 16:20:05.50 -20:03:23.00 HD 147010 ACIS-S NONE 15.00 19:34:43.90 +43:56:45.10 HD 184905 ACIS-S NONE 15.00 21:52:01.00 +55:47:48.30 HD 208095 ACIS-S NONE 15.00 22:44:07.50 +55:35:21.20 HD 215441 ACIS-S NONE 20.00 23:02:43.90 +55:14:11.00 HD 217833 ACIS-S NONE 15.00 =================================================================================== Proposal Number: 06200158 Proposal Title: The location and spatial structure of the X-ray emitting plasma in the magnetically confined environment of beta Cep PI: Coralie Neiner Subject Category: STARS AND WD Abstract: A magnetic field has recently been discovered for the first time in two Be stars, and a magnetically-confined wind shock (MCWS) model has been proposed to explain the rotational modulation observed in the UV resonance lines sensitive to the wind and several other observables. We propose to observe the slowly rotating magnetic Be star beta Cep, using two phase-constrained Chandra LETG observations to test the MCWS model for the X-ray emission of magnetic Be stars and constrain the location and radial velocity of the X-ray emitting plasma around the star. Grat- Exp. R.A. Dec. (J2000) Target Name Det. ing Time ----------------------------------------------------------------------------------- 21:28:39.60 +70:33:38.50 beta Cep HRC-S LETG 140.00 =================================================================================== Proposal Number: 06200164 Proposal Title: The issue of coronal abundances: observation of two active stars with well determined photospheric abundances PI: Jorge Sanz-Forcada Subject Category: STARS AND WD Abstract: The long-debated issue of the coronal abundances in active stars has not yet arrived to conclusive results, in large part because for most of the stars for which coronal abundances have been determined, no published photospheric abundances are available. This is specially true for the most active stars, in which large rotational velocity complicates the measurement of photospheric abundances. We propose to determine the coronal abundances of two active stars with low projected rotational velocities, for which we have determined accurate photospheric abundances. Grat- Exp. R.A. Dec. (J2000) Target Name Det. ing Time ----------------------------------------------------------------------------------- 01:16:36.40 -02:30:01.30 AY Cet HRC-S LETG 43.00 =================================================================================== Proposal Number: 06200204 Proposal Title: A Chandra HETGS Survey of O-Stars PI: Wayne Waldron Subject Category: STARS AND WD Abstract: We are requesting HETGS observations of 6 normal O-stars to further explore the characteristics and the origin of the remarkably detailed X-ray line spectra that has been revealed by Chandra. These new targets have been carefully selected on the basis of their normal optical and UV spectra, instead of their X-ray brightness or peculiarity. Along with archival HETGS spectra, this collection will provide complete coverage of the O-star domain in the H-R diagram. The spectra from this unbiased sample will be assembled in a comprehensive X-ray atlas, which will be used to search for morphological trends in the emission lines as a function of stellar parameters. These trends will guide the development of quantitative models to explain the behavior of the X-ray emission lines of O-type stars. Grat- Exp. R.A. Dec. (J2000) Target Name Det. ing Time ----------------------------------------------------------------------------------- 06:40:58.70 +09:53:44.70 15 Mon ACIS-S HETG 108.00 10:43:57.50 -59:32:51.00 HD93129AB ACIS-S HETG 145.00 10:44:45.00 -59:33:54.70 HD93250 ACIS-S HETG 24.00 10:44:45.00 -59:33:54.70 HD93250 ACIS-S HETG 170.00 18:03:52.40 -24:21:38.60 9 Sgr ACIS-S HETG 147.00 =================================================================================== Proposal Number: 06200255 Proposal Title: Simultaneous X-ray and Radio Monitoring of YSO Activity in the Coronet Cluster PI: Jan Forbrich Subject Category: STARS AND WD Abstract: As of now, X-ray and radio continuum flares from young stellar objects have mainly been studied as separate phenomena. Thus we propose simultaneous X-ray and VLA high-resolution radio monitoring of a collection of promising YSOs in the Coronet cluster. Within this cluster, we will be able to study at least five class I protostars with a minimum total number of 10 sources to be simultaneously monitored. Additional near-infrared observations, if possible within the Chandra/VLA timeframe, will further increase the value of this multi-wavelength monitoring campaign. Grat- Exp. R.A. Dec. (J2000) Target Name Det. ing Time ----------------------------------------------------------------------------------- 19:01:45.00 -36:58:09.00 Coronet Cluster ACIS-I NONE 15.00 19:01:45.00 -36:58:09.00 Coronet Cluster ACIS-I NONE 15.00 19:01:45.00 -36:58:09.00 Coronet Cluster ACIS-I NONE 15.00 19:01:45.00 -36:58:09.00 Coronet Cluster ACIS-I NONE 15.00 19:01:45.00 -36:58:09.00 Coronet Cluster ACIS-I NONE 15.00 =================================================================================== Proposal Number: 06200274 Proposal Title: h and Chi Per: The Loudest Sources? PI: NANCY EVANS Subject Category: STARS AND WD Abstract: We propose Chandra observations of the young (14 Myr) stars in the distinctive double cluster h and Chi Per. We have found X-ray sources among the pre-main sequence stars in a ROSAT PSPC image which are more luminous than sources in the younger Orion Nebula cluster. This may imply a higher level of stellar activity than previously measured. High resolution Chandra images will be used to identify the stellar counterparts of X-ray sources, search for a bridge between the clusters, determine the X-ray luminosity distribution, investigate whether the very strong sources are single sources, and study the development of the hot component of the spectra. Optical followup is planned to examine the spectra for emission lines, multiplicity, and rotation. Grat- Exp. R.A. Dec. (J2000) Target Name Det. ing Time ----------------------------------------------------------------------------------- 02:19:02.20 +57:07:12.00 h Per ACIS-I NONE 40.00 02:20:32.00 +57:03:28.00 Inter-Per ACIS-I NONE 10.00 =================================================================================== Proposal Number: 06200294 Proposal Title: The X-ray Spectrum of a Planetary Nebula at High Resolution PI: Joel Kastner Subject Category: STARS AND WD Abstract: Planetary nebulae (PNs) provide unique insights into a wide range of astrophysical phenomena. X-ray imaging of PNs by CXO has now broken open the study of very high temperature gas in these objects. To make further progress, we require detailed information concerning gas temperature and composition as a function of position within X-ray emitting PN "hot bubbles." Such information can be obtained only from observations combining high spectral and spatial resolution. We propose a 300 ks LETG/ACIS-S exposure of BD+303639, a particularly X-ray-bright PN. Such a deep, high spectral resolution observation of a PN has yet to be attempted. The proposed observation thus represents a potential breakthrough in our understanding of the origin and evolution of PNs. Grat- Exp. R.A. Dec. (J2000) Target Name Det. ing Time ----------------------------------------------------------------------------------- 19:34:45.20 +30:30:58.90 BD +303639 ACIS-S LETG 130.00 19:34:45.20 +30:30:58.90 BD +303639 ACIS-S LETG 170.00 =================================================================================== Proposal Number: 06200332 Proposal Title: A Rich Population of Massive Young Stars in the Cluster Westerlund 1 PI: Stephen Skinner Subject Category: STARS AND WD Abstract: The compact heavily-reddened cluster Westerlund 1 in the southern Milky Way is spectacularly revealed in near-infrared images. The cluster is very young (age 3 - 8 My) and is dominated by a diverse population of high-mass stars that are undergoing rapid mass-loss and have already evolved off the main sequence. These include red and blue supergiants, a luminous blue variable candidate, and 11 recently-discovered Wolf-Rayet (WR) stars. In addition, nonthermal radio emission indicative of high-energy processes is present. We propose to obtain a sensitive Chandra ACIS observation of Westerlund 1 to identify X-ray emitting cluster members, test the validity of wind-shock theories of X-ray emission in massive stars, and search for diffuse X-rays from hot gas in the cluster wind. Grat- Exp. R.A. Dec. (J2000) Target Name Det. ing Time ----------------------------------------------------------------------------------- 16:47:05.40 -45:50:36.70 Westerlund1 ACIS-S NONE 60.00 =================================================================================== Proposal Number: 06200370 Proposal Title: Resolving the Puzzle of Hybrid Star Coronal X-rays PI: THOMAS AYRES Subject Category: STARS AND WD Abstract: We propose 20 ks HRC-I pointings to detect 3 members of the so-called "hybrid star" class, and 50 ks to confirm a previous HRC-I detection of the archetype noncoronal giant Arcturus. Coronal activity, mirrored in X-ray emission, is important to the Sun-Earth connection, the fate of primitive planetary atmospheres, and a broad reaching set of magnetic phenomena in diverse cosmic environments. Our program will explore the limits of X-ray activity across the "coronal dividing line," focussing on targets for which ROSAT-era detections have been challenged recently. Assessing the true levels of coronal activity in these objects has important implications for understanding the initiation of chromospheric winds in red giants, a key phenomenon whose origins remain elusive. Grat- Exp. R.A. Dec. (J2000) Target Name Det. ing Time ----------------------------------------------------------------------------------- 17:56:36.40 +51:29:20.00 HD 164058 HRC-I NONE 20.00 21:31:33.50 -05:34:16.20 HD 204867 HRC-I NONE 20.00 22:05:47.00 -00:19:11.50 HD 209750 HRC-I NONE 20.00 =================================================================================== Proposal Number: 06200432 Proposal Title: Untangling the Accretion Spots on Classical T Tauri Stars PI: Andisheh Mahdavi Subject Category: STARS AND WD Abstract: Many Classical T Tauri Stars (CTTS) possess accretion spots where magnetically funneled material crashes onto the photosphere from the surrounding disk. As the star rotates, so does the spot, yielding a clear periodicity in the optical light curves. The same regular variation should be present in the X-ray emission despite complicating factors such as flares; however, this effect has never been conclusively proved. We propose to separate the X-ray spectrum of the chromosphere from that of the accretion spot by observing GK and GI Tau at four different phases in their rotation. By comparing the X-ray spectra at minimum and maximum occultation, we can isolate the accretion process from other X-ray activity in these stars. Grat- Exp. R.A. Dec. (J2000) Target Name Det. ing Time ----------------------------------------------------------------------------------- 04:33:34.50 +24:21:09.00 GK Tau ACIS-S NONE 15.00 04:33:34.50 +24:21:09.00 GK Tau ACIS-S NONE 15.00 04:33:34.50 +24:21:09.00 GK Tau ACIS-S NONE 15.00 04:33:34.50 +24:21:09.00 GK Tau ACIS-S NONE 15.00 =================================================================================== Proposal Number: 06200506 Proposal Title: Doppler Imaging of WR140's Collisionless Shocks at Apastron PI: Andrew Pollock Subject Category: STARS AND WD Abstract: The Chandra observation of WR140 at its X-ray brightest just before the periastron passage of 2001-02-05 revealed direct evidence of a plasma out of equilibrium after collisionless shock heating. A similar observation 4 years later at apastron will sample the opposite extreme of physical conditions encountered by the shocks. With densities more than 200 times lower expected and cooler ions flowing into the shock, Compton relaxation and ionization evolution should proceed more slowly, so that not only will the line shapes map the flow of gas in the new geometry but should be much cooler. This may explain the hitherto unexplained phase variability of the Fe lines detected by ASCA. Grat- Exp. R.A. Dec. (J2000) Target Name Det. ing Time ----------------------------------------------------------------------------------- 20:20:28.00 +43:51:16.30 WR 140 ACIS-S HETG 150.00 =================================================================================== Proposal Number: 06200517 Proposal Title: MAGNETIC ACTIVITY IN YOUNG STARS: THE WEAK-LINED T TAURI STAR HDE 245059 PI: MARC AUDARD Subject Category: STARS AND WD Abstract: We propose to study the bright weak-lined T Tauri star, HDE 245059 Tau, with Chandra HETGS. The young star displays strong X-ray luminosity (log Lx ~ 32 erg/s), but a surprisingly cooler (6-8 MK) plasma than in several X-ray bright weak-lined T Tauri stars. Its soft X-ray spectrum is reminiscent of that of TW Hya, a classical T Tauri star whose grating X-ray spectrum revealed a cool (3 MK) plasma with high densities (log ne ~ 13 cm-3) probably due to accretion, in contrast with other classical T Tauri stars with dominant very hot (T ~ 30 MK) plasmas. We will investigate the X-ray properties of HDE 245059, and in particular determine electron densities from several He-like triplets. We will put our results in the context of the evolution with time of magnetic activity in stars. Grat- Exp. R.A. Dec. (J2000) Target Name Det. ing Time ----------------------------------------------------------------------------------- 05:34:34.90 +10:07:06.20 HDE 245059 ACIS-S HETG 100.00 =================================================================================== Proposal Number: 06200570 Proposal Title: A MINI-SURVEY OF MAGNETIC ACTIVITY IN L AND T BROWN DWARFS PI: MARC AUDARD Subject Category: STARS AND WD Abstract: We propose a mini-survey of magnetic activity in L and T brown dwarfs in the X-rays with Chandra and in the radio with the VLA and ATCA. Our mini-sample includes two L and one T brown dwarfs. Our Chandra exposures will reach X-ray luminosities down to log Lx/Lbol = -4. Our targets are close, old (~1 Gyr) brown dwarfs, whose Halpha emission should not be contaminated by any accretion mechanism as in young brown dwarfs. With this Chandra proposal, we aim at detecting X-rays during quiescence or flares. Coordination with the VLA and ATCA radio telescopes is proposed as well. Even if undetected, upper limits will provide strong constraints for models of magnetic activity at the very bottom of the main sequence. Grat- Exp. R.A. Dec. (J2000) Target Name Det. ing Time ----------------------------------------------------------------------------------- 13:05:40.00 -25:41:05.90 Kelu-1 ACIS-S NONE 24.00 =================================================================================== Proposal Number: 06200643 Proposal Title: CORONAL FLARING AND THE NEUPERT EFFECT ON THE ACTIVE BINARY SIGMA GEM PI: Alexander Brown Subject Category: STARS AND WD Abstract: We propose coordinated HETGS, STIS, and radio (VLA,VLBA,MERLIN,Arecibo) observations of the RS CVn binary Sigma Gem to observe flaring and quiescent coronal emission, test whether the flares show the Neupert effect expected from chomospheric evaporation models, and determine the flare energy budget. HETGS will measure changes in the coronal emission measure, temperature, density, and elemental abundances. Radio continuum emission will provide a proxy for the high energy particles accelerated during magnetic reconnection. STIS Fe XXI spectra will measure the flare dynamical energy losses. Sigma Gem is an ideal target because it is one of the brightest RS CVns in X-rays, single-lined, and flares 40% of the time. Its long duration flares increase the likelihood of tracking flare evolution. Grat- Exp. R.A. Dec. (J2000) Target Name Det. ing Time ----------------------------------------------------------------------------------- 07:43:18.70 +28:52:59.70 SIGMA GEM ACIS-S HETG 130.00 =================================================================================== Proposal Number: 06200645 Proposal Title: The Production of X-ray Emission in Classical T Tauri Stars PI: Gregory Herczeg Subject Category: STARS AND WD Abstract: We propose to obtain a 150 ks HETG spectrum of the Classical T Tauri Star (CTTS) V4046 Sgr. The unknown source of strong X-ray emission remains a glaring weakness in our understanding of energetics around young stars. An HETG observation of the CTTS TW Hya suggested that the physical properties of the hot gas around accreting stars may be different from solar-like coronae. This difference hints that accretion may produce most of the X-rays from CTTSs. However, this tentative conclusion is based on observations of only one CTTS, that may not be representative of its class. We seek to verify this conclusion, and to obtain a better understanding of the temperature, electron density, and abundances of hot gas around CTTSs, by obtaining a high S/N HETG spectrum of an X-ray bright CTTS. Grat- Exp. R.A. Dec. (J2000) Target Name Det. ing Time ----------------------------------------------------------------------------------- 18:14:10.50 -32:47:34.50 V4046 Sgr ACIS-S HETG 150.00 =================================================================================== Proposal Number: 06200661 Proposal Title: The power within the PacMan Nebula: Triggered Star Formation in NGC 281 PI: Scott Wolk Subject Category: STARS AND WD Abstract: We propose deep a moderately deep (100ks) ACIS-I observation of the unique, edge-on, star forming region NGC 281. The proposed pointing will include 3 separate but related sites of star formation within 4 pc of eachother. The oldest region includes several 3.5Myr old O stars while the youngest regions are still active. We will determine whether the sites are part of a single, continuous cluster, or whether they are separate clusters created by distinct episodes of star formation - as predicted by the clump implosion scenario. The edge-on aspect of the region allows us to study the diffuse plasma in the region to understand the role of X-ray ionization along the HII region/molecular cloud interface. We will also directly observe the thermal evolution of the hot corona. Grat- Exp. R.A. Dec. (J2000) Target Name Det. ing Time ----------------------------------------------------------------------------------- 00:52:27.10 +56:33:54.00 NGC 281 ACIS-I NONE 100.00 =================================================================================== Proposal Number: 06200742 Proposal Title: How Do T Tauri Stars Generate X-rays? PI: David Weintraub Subject Category: STARS AND WD Abstract: X-ray emission is an indicator of the presence of powerful magnetic fields in the immediate environments of young stars. In turn, the magnetic reconnection events that generate the X-rays require a stimulus. If PMS stars are like MS stars, fast rotation generates coronal X-rays; however, strong evidence exists that X-rays from classical T Tauri stars (TTS) may be generated through accretion streams. We request 120 ksec to survey six binary systems (20 ksec per binary), each containing one classical TTS and one weak-lined (diskless) TTS. Using subpixel event repositioning techniques, as neccessary, we will determine the X-ray flux rates and spectral energy distributions for these TTS and thereby provide important constraints on theories for X-ray generation from PMS stars. Grat- Exp. R.A. Dec. (J2000) Target Name Det. ing Time ----------------------------------------------------------------------------------- 04:31:57.70 +18:21:36.90 V710 Tau ACIS-S NONE 10.00 04:31:57.70 +18:21:36.90 V710 Tau ACIS-S NONE 10.00 =================================================================================== Proposal Number: 06200872 Proposal Title: Multi-Wavelength Signatures of Magnetic Activity in the Star-Forming Region around LkHa101 PI: Scott Wolk Subject Category: STARS AND WD Abstract: Among several classes of active stars and solar flares, a tight relation is found between X-ray and radio luminosities. This relation, which implies an intimate physical connection, has been subject to coordinated radio and X-ray studies for particular active binaries and dMe stars, but never among one of the most active classes of stars, pre-main sequence stars. Here, we propose a pair of 40ks coordinated VLA/ACIS-I observations of the nearby young cluster around LkHa101. We will examine the X-ray radio connection simultaneously for several scores of stars. The data will tighten the relation of the quiescent emission and study the causal relation of radio and X-ray flares for young stars with and without disks. Grat- Exp. R.A. Dec. (J2000) Target Name Det. ing Time ----------------------------------------------------------------------------------- 04:30:14.40 +35:16:22.20 LkHa101 cluster ACIS-I NONE 40.00 04:30:14.40 +35:16:22.20 LkHa101 cluster ACIS-I NONE 40.00 =================================================================================== Proposal Number: 06200882 Proposal Title: Planet-Induced Activity Enhancements in the HD 179949 System PI: Steven Saar Subject Category: STARS AND WD Abstract: Many exoplanets are gas giants extremely close (<0.1 AU) to their parent stars, suggesting the possibility of exotic interactions. Recently, weakly enhanced Ca II HK emission was found in the HD 179949 system, phased to the orbital (~3 d) and not to the stellar rotation period (~8 d). Theory suggests this enhancement is due to a magnetic interaction (MI) between the star and planet. Since the resulting heating should be largest in X-rays, we propose to study the system with Chandra to further characterize the MI. We will use HST to study the MI effect on the planet's ablating atmosphere by observing Doppler shifted H~I around quadrature. These datasets will enable us to test interaction theories, and estimate exoplanetary magnetic fields, mass loss and stellar wind properties. Grat- Exp. R.A. Dec. (J2000) Target Name Det. ing Time ----------------------------------------------------------------------------------- 19:15:33.20 -24:10:45.70 HD 179949 ACIS-S NONE 150.00

*********************************************************************************** WD BINARIES AND CV -------------------------------------------------- =================================================================================== Proposal Number: 06300119 Proposal Title: Chandra Soft X-ray Spectroscopy of QS Tel PI: Christopher Mauche Subject Category: WD BINARIES AND CV Abstract: We propose to observe one of the brightest polars, QS Tel, with the Chandra LETGS to measure the spectral energy distribution of the accretion-heated photosphere, the depths of the absorption edges, and the depths and widths of the discrete absorption features. These data will be used to constrain the run of temperature with optical depth in the photosphere and hence determine the relative importance of irradiation versus "deep heating" to the energetics of the photosphere. [This proposal was accepted for TOO observations during Cycle 5, but QS Tel has entered a low state, so the proposal is being resubmitted to cover the small chance that the source does not become bright again before the end of the current cycle.] Grat- Exp. R.A. Dec. (J2000) Target Name Det. ing Time ----------------------------------------------------------------------------------- 19:38:35.70 -46:12:56.50 QS Tel HRC-S LETG 84.00 =================================================================================== Proposal Number: 06300120 Proposal Title: Coordinated Multiwavelength Observations of AE Aqr PI: Christopher Mauche Subject Category: WD BINARIES AND CV Abstract: We propose to conduct an ambitious campaign of coordinated multiwavelength observations of the former supersoft X-ray binary and current magnetic propeller AE Aqr. Recent XMM observations have thrown into doubt the source of the X-ray emission and the heating of the optical and UV emission line regions. We propose to observe AE Aqr for 2 binary orbits with the Chandra HETG to measure the radial velocity variations of the X-ray emission lines and constrain the plasma density. We also propose to obtain 6 orbits of HST high-resolution time-tagged UV spectroscopy and 12 hrs of VLA time, to which we will add mm through gamma-ray data. These data will provide the most complete picture of the locations, mass motions, energetics, and interrelationships of the various emission regions. Grat- Exp. R.A. Dec. (J2000) Target Name Det. ing Time ----------------------------------------------------------------------------------- 20:40:09.20 -00:52:15.10 AE Aqr ACIS-S HETG 78.00 =================================================================================== Proposal Number: 06300176 Proposal Title: Chandra HETG Spectroscopy of the VY Sculptoris Star TT Ari PI: Christopher Mauche Subject Category: WD BINARIES AND CV Abstract: Existing data indicate that high mass-accretion rate (Mdot) nonmagnetic cataclysmic variables (nmCVs) like novalike variables, VY Scl stars, and dwarf novae in outburst have X-ray spectra that are far more interesting (have brighter lines arising from a broader range of ionization stages) than those of low-Mdot nmCVs like dwarf novae in quiescence. However, most of the nmCVs already targeted by Chandra and XMM are dwarf novae in quiescence. We propose to remedy the imbalance between low-Mdot and high-Mdot nmCVs by observing the brightest VY Scl star, TT Ari, with the Chandra HETG. With this spectrum we will constrain the emission measure distribution, line velocity widths, abundances, density, and geometry of the X-ray-emitting plasma, thereby constraining the boundary layer parameters. Grat- Exp. R.A. Dec. (J2000) Target Name Det. ing Time ----------------------------------------------------------------------------------- 02:06:53.10 +15:17:43.00 TT Ari ACIS-S HETG 100.00 =================================================================================== Proposal Number: 06300279 Proposal Title: Plasma and Kinematic Diagnoses of the Post-Shock Cooling Plasma in the Intermediate Polar YY Draconis PI: Koji Mukai Subject Category: WD BINARIES AND CV Abstract: We propose a 100 ksec Chandra HETG/ACIS-S observation of the intermediate polar, YY Dra. The existing ASCA data suggest that this is one of the few magnetic CVs with a cooling flow-like X-ray spectrum. The double humped X-ray spin modulation of YY Dra implies that we view both poles during a spin cycle. The combination of these two factors makes YY Dra an ideal target for an HETG observation. We intend to analyze the results both within the context of existing multi-wavelength data on YY Dra and of existing Chandra data of magnetic and non-magnetic CVs. The unique geometry and X-ray brightness of YY Dra should provide phase-averaged and phase-resolved spectra that will clarify our understanding of accretion in the presence of magnetic fields. Grat- Exp. R.A. Dec. (J2000) Target Name Det. ing Time ----------------------------------------------------------------------------------- 11:43:38.30 +71:41:20.40 YY Draconis ACIS-S HETG 100.00 =================================================================================== Proposal Number: 06300481 Proposal Title: Sensitive X-ray surveys of the nearby globular clusters NGC 6544, NGC 6838 (M71), and NGC 6656 (M22) PI: Ronald Elsner Subject Category: WD BINARIES AND CV Abstract: We propose moderately deep ACIS-S surveys of the nearby globular clusters NGC 6544, NGC 6838 (M71), and NGC 6656 (M22). We request two orbits of HST/ACS time to study the crowded core of NGC 6544. Existing archival HST and ground-based optical data suffice for M22 and M71. These observations will provide high-sensitivity surveys of the quiescent low-mass x-ray binary, cataclysmic variable, milli-second pulsar, and chromospherically active binary populations of these clusters, important inputs to models of globular cluster evolution. We will detect the newly discovered milli-second pulsars in NGC 6544 and M71 if they are as bright as the faint milli-second pulsars in 47 Tuc. We will confirm or exclude the identification of an apparent dwarf nova with an x-ray source in the core of M22. Grat- Exp. R.A. Dec. (J2000) Target Name Det. ing Time ----------------------------------------------------------------------------------- 19:53:46.10 +18:46:42.20 NGC 6838 (M71) ACIS-S NONE 53.00 =================================================================================== Proposal Number: 06300541 Proposal Title: A Uniform Study of Globular Cluster X-ray Sources: the Keys to Cluster Dynamical Evolution PI: Walter Lewin Subject Category: WD BINARIES AND CV Abstract: We propose to extend our ongoing studies of the dynamical evolution of globular clusters by observing their populations of low-luminosity X-ray sources. Many of these sources are binary systems (or have evolved from them) and hold the key to the cluster's dynamical evolution. We propose observations of a variety of clusters with widely different physical properties such as central concentration, cluster size and mass, which are all key ingredients in the formation and evolution of binaries. To make this study as uniform as possible, the clusters will be observed to the same limiting luminosity. Joint observations with HST will allow for definitive source identification. Grat- Exp. R.A. Dec. (J2000) Target Name Det. ing Time ----------------------------------------------------------------------------------- 16:41:41.50 +36:27:37.00 NGC 6205 ACIS-S NONE 59.00 18:07:20.60 -24:59:51.00 NGC 6544 ACIS-S NONE 17.00 18:36:24.20 -23:54:12.00 NGC 6656 ACIS-S NONE 16.00 =================================================================================== Proposal Number: 06300849 Proposal Title: R Aquarii X-ray Jets: a synoptic study PI: Edwin Kellogg Subject Category: WD BINARIES AND CV Abstract: Chandra showed the symbiotic star R Aqr in 2000.69 and 2003.99 has remarkable evolution in its x-ray jets. The NE jet has moved out with a tangential velocity of 600 km/s, much higher than any previously known motion in this system. The SW outer jet has apparently faded, while an inner SW jet is emerging from the central source. We propose three observations next year, one at minimum light of the mira donor star, another at maximum light, and a third coincident with our FUSE 5 observation. This will allow modeling shock processes in the jets as they interact with the surrounding hourglass nebulae and also tell us whether the mira pulsations accompany x-ray emission changes from the central star, elucidating mass transfer and accretion disk or winds surrounding the compact star. Grat- Exp. R.A. Dec. (J2000) Target Name Det. ing Time ----------------------------------------------------------------------------------- 23:43:49.60 -15:17:03.70 R Aqr ACIS-S NONE 70.00 =================================================================================== Proposal Number: 06300907 Proposal Title: X-Ray Observation of a Transient Symbiotic-Star jet PI: Jennifer Sokoloski Subject Category: WD BINARIES AND CV Abstract: Astrophysical jets are ubiquitous in the universe, yet the collimation and acceleration mechanisms for these outflows are unclear. Accretion disks, however, are likely to play a key role. White dwarfs have possibly the best-understood disks, so symbiotic stars (SS), which are a recently identified class of jet-producing objects, are promising targets. The two SS x-ray jets that have been discovered to date (R Aqr and more recently, CH Cyg) both show x-ray structure even more extended than their radio jets. To further study the X-ray properties of SS jets, most of which are transient, plus investigate changes in the central object when a jet in ejected, we propose a Chandra TOO observation of the next SS jet that is discovered. This proposal was accepted in AO5, but not triggered. Grat- Exp. R.A. Dec. (J2000) Target Name Det. ing Time ----------------------------------------------------------------------------------- Transient Symbiotic- ACIS-S NONE 100.00 =================================================================================== Proposal Number: 06300908 Proposal Title: Testing Accretion Scenarios at the Eddington Limit PI: Vadim Burwitz Subject Category: WD BINARIES AND CV Abstract: We propose to obtain five 25 ksec HRC-S+LETG observations of the transient supersoft X-ray binary RX J0513.3-6951 distributed over a complete ~40 day long X-ray on state. This data will for the first time provide a spectral resolution adequate for a detailed LTE and non-LTE modelling of the hot stellar atmosphere, and will unequivocally reveal the nature of the accreting compact object. The expected spectral changes during the exponential decline phase of the soft X-ray flux will allow us to accurately determine the temporal variation of the radius and effective temperature of the stellar photosphere. The observations are a viable test of different scenarios proposed for the response of compact binaries to accretion rates close to the Eddington critical limit and their long-term evolution. Grat- Exp. R.A. Dec. (J2000) Target Name Det. ing Time ----------------------------------------------------------------------------------- 05:13:50.80 -69:51:47.00 RXJ0513.9-6951 HRC-S LETG 25.00 05:13:50.80 -69:51:47.00 RXJ0513.9-6951 HRC-S LETG 25.00 05:13:50.80 -69:51:47.00 RXJ0513.9-6951 HRC-S LETG 25.00 05:13:50.80 -69:51:47.00 RXJ0513.9-6951 HRC-S LETG 25.00 05:13:50.80 -69:51:47.00 RXJ0513.9-6951 HRC-S LETG 25.00 =================================================================================== Proposal Number: 06301031 Proposal Title: Supersoft X-rays from the VY Scl type stars PI: Peter Predehl Subject Category: WD BINARIES AND CV Abstract: We propose a GTO/TOO observe the supersoft X-rays from the VY Scl stars during their optical low/X-ray bright state. Grat- Exp. R.A. Dec. (J2000) Target Name Det. ing Time ----------------------------------------------------------------------------------- Super Soft Source ACIS-S NONE 10.00 Super Soft Source ACIS-S NONE 75.00

*********************************************************************************** BH AND NS BINARIES -------------------------------------------------- =================================================================================== Proposal Number: 06400015 Proposal Title: The Energy Distribution of GS1354-64 PI: Stephen Murray Subject Category: BH AND NS BINARIES Abstract: In 1967 the X-ray nova Cen X-2 was observed in a succession of several sounding rocket flights and reached an astounding maximum observed intensity of 13 Crab. The faint (0.12 Crab) 1987 X-ray nova GS1354-64 and its optical counterpart (BW Cir) appear to be one and the same as Cen X-2. If this association is true, then scaling from A0620-00, we would expect the X-ray novae to lie at a distance of ~1-2 kpc and be relatively bright in quiescence. These observations would therefore provide a high quality spectrum of a BHXN in quiescence. We expect the mass function to be determined soon, and therefore the quiescent luminosity will provide additional evidence for the faintness of BHs relative to NSs. Grat- Exp. R.A. Dec. (J2000) Target Name Det. ing Time ----------------------------------------------------------------------------------- 13:58:09.70 -64:44:05.20 GS1354-64 / BW Cir ACIS-S NONE 40.00 =================================================================================== Proposal Number: 06400097 Proposal Title: Faint quiescent neutron star soft X-ray transients PI: Peter Jonker Subject Category: BH AND NS BINARIES Abstract: We propose to obtain a 20 ksec ACIS-S observation of 1H1715-321 and a 25 ksec of 1H1905+000. Because of non--detections during very short previous Chandra observations, both sources have to have a low quiescent luminosity. They also have a low N_H and a well-known source distance. Finally, the source position is known accurately enough to circumvent source confusion. These observations will reduce the gap in the derived quiescent luminosities between neutron star and BH SXTs which is used as being evidence for a BH event horizon. Furthermore, a low-luminosity neutron star means a relatively cold, and therefore likely, massive neutron star. The masses of neutron stars provide important constraints on the EoS of ultra-dense matter. This is one of the ultimate goals of neutron star studies. Grat- Exp. R.A. Dec. (J2000) Target Name Det. ing Time ----------------------------------------------------------------------------------- 17:18:47.40 -32:10:40.00 1H 1715-321 ACIS-S NONE 20.00 19:08:27.00 +00:10:08.00 1H 1905+000 ACIS-S NONE 25.00 =================================================================================== Proposal Number: 06400115 Proposal Title: Following a black hole candidate soft X-ray transient returning to quiescence PI: Peter Jonker Subject Category: BH AND NS BINARIES Abstract: We propose to obtain 5 observations of a BH SXT as it returns to quiescence, for each of the observations we also request a nearly simultaneous VLA radio observation. Using these observations we can test whether the empirical relation between the radio and X-ray flux found over 4 decades in X-ray flux in low/hard state BH SXTs extends to X-ray flux levels a factor of 600 lower. If this relation holds this may explain the fact that the BH SXTs in quiescence are fainter in X-rays than NS SXTs without the need of a BH event-horizon. Furthermore, we will obtain high quality spectra of a BH SXT at scarcely studied luminosity intervals, allowing us to determine whether the evolution of the powerlaw spectral index is smooth or abrupt. Grat- Exp. R.A. Dec. (J2000) Target Name Det. ing Time ----------------------------------------------------------------------------------- TOO ACIS-S HETG 5.00 TOO ACIS-S HETG 5.00 TOO ACIS-S NONE 10.00 TOO ACIS-S NONE 20.00 TOO ACIS-S NONE 40.00 =================================================================================== Proposal Number: 06400127 Proposal Title: Precise astrometry of the X-ray sources 4U1700+24 and 4U1954+319 PI: Nicola Masetti Subject Category: BH AND NS BINARIES Abstract: We propose to observe two peculiar galactic X-ray sources, 4U1700+24 and 4U1954+319, which are suspected to have an M-type giant star as optical counterpart, in order to get an high-precision astrometric position for both of them. This would definitely settle the issue of the identification of their true optical counterpart, which is important given that X-ray binary systems with a red giant as confirmed companion are extremely rare. Two very short (`snapshot') observations with Chandra will secure this result. Grat- Exp. R.A. Dec. (J2000) Target Name Det. ing Time ----------------------------------------------------------------------------------- 17:06:34.60 +23:58:14.00 4U 1700+24 HRC-I NONE 1.00 19:55:42.10 +32:05:56.50 4U 1954+319 HRC-I NONE 1.00 =================================================================================== Proposal Number: 06400159 Proposal Title: X-Ray Jets in Microquasars PI: Stephane Corbel Subject Category: BH AND NS BINARIES Abstract: We propose Target of Opportunity (ToO) observations for detailed studies of X-ray jets from microquasars. We describe our discovery of radio/X-ray jets in two microquasars and why X-ray jets are probably much more common than previously thought and also why it offers an exciting new way to probe the physics of the jets. The proposed ToO observations are optimized to discover and study (flux evolution, morphology, SED, proper motion, ...) new X-ray jets from microquasars, based on their detection as radio lobes. This will have implications not only for the study of jets from Galactic X-ray binaries, but also for our understanding of relativistic jets from active galactic nuclei (AGN). Grat- Exp. R.A. Dec. (J2000) Target Name Det. ing Time ----------------------------------------------------------------------------------- X-ray Jets ACIS-S NONE 30.00 X-ray Jets ACIS-S NONE 50.00 X-ray Jets ACIS-S NONE 60.00 =================================================================================== Proposal Number: 06400177 Proposal Title: Relativistic Effects and Outflows in a Black Hole Transient PI: Jon Miller Subject Category: BH AND NS BINARIES Abstract: Our Chandra observations of Galactic BH systems have begun to reveal relativistic effects and important connections between stellar-mass black holes and the super-massive black holes powering Seyferts, including relativistic iron emission lines and outflowing warm absorber geometries. We propose to observe a Galactic BH transient in outburst for 200 ksec, in 4 obs. of 50 ksec, using the HETGS. These observations will probe relativistic effects near black holes, the nature and evolution of disk winds and warm absorbers, the emerging disk-jet connection in BH systems, and the dependence of the accretion flow geometry on mass accretion rate and other parameters. These observations will be supported by a global multi-wavelength (radio, IR, optical, X-ray, gamma-ray) program. Grat- Exp. R.A. Dec. (J2000) Target Name Det. ing Time ----------------------------------------------------------------------------------- BH Transient ACIS-S HETG 50.00 BH Transient ACIS-S HETG 50.00 BH Transient ACIS-S HETG 50.00 BH Transient ACIS-S HETG 50.00 =================================================================================== Proposal Number: 06400219 Proposal Title: Quiescent X-ray counterparts of Globular Cluster transients PI: Rudy Wijnands Subject Category: BH AND NS BINARIES Abstract: We propose to continue our successful program on the quiescent X-ray counterparts of known bright neutron-star X-ray transients in Galactic globular clusters. The relatively well-known distances to those clusters make them excellent targets to study the properties of their quiescent neutron-star systems. Previous Chandra and ROSAT/HRI observations of the clusters caught the transient systems in outburst, providing (sub-)arcsecond positions for those transients and allowing immediate X-ray identification of their quiescence counterparts. We will also obtain excellent data on the low-luminosity X-ray source population of the target globular clusters which we will use in our ongoing efforts to determine the nature of these sources. Grat- Exp. R.A. Dec. (J2000) Target Name Det. ing Time ----------------------------------------------------------------------------------- 17:35:47.30 -30:28:55.00 Terzan 1 ACIS-S NONE 20.00 =================================================================================== Proposal Number: 06400222 Proposal Title: Quasi-persistent neutron-star X-ray binaries in quiescence PI: Rudy Wijnands Subject Category: BH AND NS BINARIES Abstract: We propose to observe the next (quasi-)persistent neutron-star low-mass X-ray binary that turns off and becomes quiescent. This will provide an excellent opportunity to study the effects of prolonged accretion on the neutron-star properties (i.e., crust and core) and the quiescent properties of low-mass X-ray binaries. Two follow-up observations taken several months later will provide important information about the time evolution of the quiescent properties. In particular, if indeed the quiescent X-rays are emitted by the crust, we will be able to study its evolution in time, thus setting strong constraints on the crust cooling models and the exact structure of the crust. Grat- Exp. R.A. Dec. (J2000) Target Name Det. ing Time ----------------------------------------------------------------------------------- Quiescent source ACIS-S NONE 30.00 Quiescent source ACIS-S NONE 30.00 Quiescent source ACIS-S NONE 30.00 =================================================================================== Proposal Number: 06400229 Proposal Title: Cooling curves of accretion-heated neutron stars PI: Rudy Wijnands Subject Category: BH AND NS BINARIES Abstract: We propose to observe the quasi-persistent neutron-star low-mass X-ray transients KS 1731-260 and MXB 1659-29 once in their quiescent state during cycle 6 of Chandra. These observations will strongly constrain the time evolution behavior of the quiescent properties of these systems. In the context of the cooling neutron-star model for the quiescent emission in neutron star X-ray transients, our proposed observations will follow the cooling curves of the crust and core of the neutron stars in those systems. Our previous quiescent observations of both systems have already shown that their neutron stars cooled down rapidly, setting stringent constraints on the structure of the compact objects. Grat- Exp. R.A. Dec. (J2000) Target Name Det. ing Time ----------------------------------------------------------------------------------- 17:02:06.40 -29:56:44.30 MXB 1659-29 ACIS-S NONE 50.00 17:34:13.50 -26:05:18.80 KS 1731-260 ACIS-S NONE 50.00 =================================================================================== Proposal Number: 06400243 Proposal Title: INVESTIGATING NEW INTEGRAL SOURCES WITH CHANDRA PI: Adamantia Paizis Subject Category: BH AND NS BINARIES Abstract: We propose to trigger a maximum of 2 Chandra slow TOO observations on new sources discovered by the INTEGRAL Observatory. We ask for 20 ksec per observation, using HETGS. The scientific aim is to determine the source position with subarcsecond accuracy that only Chandra can provide, enabling multiwavelength follow-up observations, and to obtain the high resolution HETG X-Ray spectrum, essential to determine the nature of the new source. This is a re-submission of an already (partially) accepted, not yet triggered, AO5 TOO Chandra proposal. Grat- Exp. R.A. Dec. (J2000) Target Name Det. ing Time ----------------------------------------------------------------------------------- New INTEGRAL source ACIS-S HETG 20.00 =================================================================================== Proposal Number: 06400328 Proposal Title: Localization of INTEGRAL-Selected Sources in the Norma Region PI: John Tomsick Subject Category: BH AND NS BINARIES Abstract: The INTEGRAL satellite is discovering a large number of new high energy sources in the Galactic plane. In most cases, the few arcminute INTEGRAL positions do not allow for identification of the "IGR" sources at other wavelengths, leaving their nature unclear. We propose to use Chandra to localize ten of the IGR sources found in the Norma region of the Galaxy, allowing us to study these sources at optical and IR wavelengths to determine if they are part of a new high energy population. Our group consists of people who have been actively involved in early IGR source studies and discoveries, and we use our long INTEGRAL observation of the Norma region to plan the proposed observations. In addition, we already have an ESO program in place for optical/IR follow-up of IGR sources. Grat- Exp. R.A. Dec. (J2000) Target Name Det. ing Time ----------------------------------------------------------------------------------- 16:16:42.00 -49:57:00.00 IGR J16167-4957 ACIS-I NONE 5.00 16:19:30.00 -49:45:00.00 IGR J16195-4945 ACIS-I NONE 5.00 16:20:42.00 -51:28:60.00 IGR J16207-5129 ACIS-I NONE 5.00 17:19:30.00 -41:00:00.00 IGR J17195-4100 ACIS-I NONE 5.00 =================================================================================== Proposal Number: 06400331 Proposal Title: Resolving the Fe Line, Warm Absorber, and Scattering Halo of GX339-4 with Joint Chandra/RXTE Observations PI: Michael Nowak Subject Category: BH AND NS BINARIES Abstract: We propose a joint Chandra/RXTE observation of GX 339-4 to be performed as a slow ToO, and during the radio-loud low/hard state of the source. We will definitively measure the Fe line in this state and resolve it into narrow and broad components. We will also study the low energy absorption spectra, and compare our results to previous "intermediate state" spectra of the source. This will enable us to determine which features are intrinsic to the system, and which are due to the ISM. We will also study the dust scattering halo in front of the source. RXTE data will provide simultaneous measurements of the broad line, high energy continuum and reflection component, and variability information. Grat- Exp. R.A. Dec. (J2000) Target Name Det. ing Time ----------------------------------------------------------------------------------- 17:02:49.40 -48:47:22.40 GX 339-4 ACIS-S HETG 60.00 =================================================================================== Proposal Number: 06400334 Proposal Title: X-RAY DIAGNOSTICS OF THE WIND OF HMXB X1908+075: POSSIBLE PROGENITOR BH-NS SYSTEM PI: Saul Rappaport Subject Category: BH AND NS BINARIES Abstract: The X-ray binary X1908+075 contains an accreting pulsar orbiting in a dense stellar wind; the column density to the neutron star varies by a factor of 5 from inferior to superior conjunction. An estimate of the mass flux in the wind suggests that the companion may be a Wolf-Rayet star rather than an ordinary OB star. If so, this system could be the first known progenitor of a black hole/neutron star binary, where the neutron star formed first. We propose HETG observations to characterize the wind in detail through both the low energy cutoff of the continuum and the emission lines expected to be produced by photoionization and fluorescence, and to obtain a precise position. The X-ray spectroscopy and followup IR spectroscopy will yield important clues to the nature of the companion. Grat- Exp. R.A. Dec. (J2000) Target Name Det. ing Time ----------------------------------------------------------------------------------- 19:10:46.00 +07:36:07.00 X1908+375: Low N_H ACIS-S HETG 50.00 19:10:46.00 +07:36:07.00 X1908+375: High N_H ACIS-S HETG 50.00 =================================================================================== Proposal Number: 06400378 Proposal Title: Accretion Disk Mapping using the P Cygni Line Profiles in Circinus X-1 PI: Norbert Schulz Subject Category: BH AND NS BINARIES Abstract: We propose to observe the luminous X-ray binary Circinus~X-1 for 75 ks in CC-mode at zero orbital phase using the High-Energy Transmission Grating Spectrometer (HETGS). We will determine the fine structure of P Cygni line profiles to diagnose the accretion disk. We also apply the method of reverberation mapping to the variable absorption and emission components. This work is the continuation of a project that has already involved five previous very successful observations, including the discovery of the first P Cygni lines in an X-ray source. Grat- Exp. R.A. Dec. (J2000) Target Name Det. ing Time ----------------------------------------------------------------------------------- 15:20:41.00 -57:10:00.00 Cir X-1 ACIS-S HETG 75.00 =================================================================================== Proposal Number: 06400405 Proposal Title: Testing and extending the fundamental plane of black hole activity PI: Rob Fender Subject Category: BH AND NS BINARIES Abstract: The recently-discovered fundamental plane of black hole activity unites the radio and X-ray luminosities of accreting black holes over nine orders of magnitude in accretion rate and eight orders of magnitude in black hole mass. This is telling us something deep about the scale-invariance of the disc-jet coupling around black holes. We propose to make a deep observation of the quiescent black hole X-ray binary A0620-00 simultaneously with Chandra and the VLA to test the fundamental plane in the the (low black hole mass, very low accretion rate) regime. Detection of A0620-00 will extend the plane two orders of magnitude beyond its current range, something which is impossible via any other observation, a key observation for our understanding of the nature of black hole accretion. Grat- Exp. R.A. Dec. (J2000) Target Name Det. ing Time ----------------------------------------------------------------------------------- 06:22:44.50 -00:20:45.00 A0620-00 ACIS-S NONE 40.00 =================================================================================== Proposal Number: 06400423 Proposal Title: Discovering X-ray pulsars in the Wing of the Small Magellanic Cloud PI: Malcolm Coe Subject Category: BH AND NS BINARIES Abstract: The Small Magellanic Cloud (SMC) is exceptionally abundant in X-ray pulsars. Over 40 have been discovered as part of a highly successful monitoring programme and, according to reliable estimates, there may be many hundreds more. In a recent analysis of 5 archive CHANDRA observations, we discovered 3 entirely new pulsars and determined the positions of two others. We propose a series of 20 observations covering those regions of the SMC Wing where the evidence suggests that conditions for the formation of pulsars are favourable. This programme can be anticipated to reveal up to 20 new pulsars. In the process it will provide a better understanding of high mass star formation rates and of the evolution of the SMC. Grat- Exp. R.A. Dec. (J2000) Target Name Det. ing Time ----------------------------------------------------------------------------------- 00:56:10.00 -73:25:15.00 SMCwing 20 ACIS-I NONE 10.00 00:58:20.00 -71:50:27.00 SMCwing 1 ACIS-I NONE 10.00 00:59:59.00 -73:18:34.00 SMCwing 19 ACIS-I NONE 10.00 01:01:54.00 -71:35:58.00 SMCwing 2 ACIS-I NONE 10.00 01:03:53.00 -73:19:33.00 SMCwing 18 ACIS-I NONE 10.00 01:03:53.00 -72:15:06.00 SMCwing 7 ACIS-I NONE 10.00 01:05:31.00 -71:37:06.00 SMCwing 3 ACIS-I NONE 10.00 01:07:41.00 -72:14:54.00 SMCwing 6 ACIS-I NONE 10.00 01:07:55.00 -73:13:10.00 SMCwing 17 ACIS-I NONE 10.00 01:08:47.00 -72:30:50.00 SMCwing 8 ACIS-I NONE 10.00 01:10:10.00 -71:49:29.00 SMCwing 4 ACIS-I NONE 10.00 01:11:20.00 -72:05:38.00 SMCwing 5 ACIS-I NONE 10.00 01:12:09.00 -73:26:10.00 SMCwing 16 ACIS-I NONE 10.00 01:12:39.00 -72:35:17.00 SMCwing 9 ACIS-I NONE 10.00 01:13:21.00 -72:57:10.00 SMCwing 11 ACIS-I NONE 10.00 01:16:21.00 -73:38:54.00 SMCwing 15 ACIS-I NONE 10.00 01:16:35.00 -72:38:16.00 SMCwing 10 ACIS-I NONE 10.00 01:20:28.00 -73:19:27.00 SMCwing 14 ACIS-I NONE 10.00 01:20:36.00 -72:45:40.00 SMCwing 12 ACIS-I NONE 10.00 01:24:10.00 -73:09:02.00 SMCwing 13 ACIS-I NONE 10.00 =================================================================================== Proposal Number: 06400593 Proposal Title: An ACIS-HETGS, RXTE, and Radio VLA-VLBA TOO of the microquasar XTE J1748-288 PI: Julia Lee Subject Category: BH AND NS BINARIES Abstract: We propose a 140ks HETGS TOO simultaneous with RXTE and radio VLA-VLBA observations of the microquasar XTE J1748-288 to characterize its broad band properties for any/all of its previously observed `very high' (30ks), `high' (40ks) and `low' (70ks) states. We will look for narrow absorption/emission lines and wind signatures with Chandra, and try to obtain a 0th order X-ray image of the relativistic jet. Simultaneous RXTE looks will give continuum spectra above 9 keV to assess coronal models and any observed accretion disk changes. Radio data will be important for detailing the jet behavior while tying into the X-ray observations to determine the connection between disk, corona and jet. This proposal was awarded the requested time in Chandra cycles AO2, AO3 & AO5, but not triggered. Grat- Exp. R.A. Dec. (J2000) Target Name Det. ing Time ----------------------------------------------------------------------------------- 17:48:05.10 -28:28:25.80 XTE J1748-288 ACIS-S HETG 30.00 17:48:05.10 -28:28:25.80 XTE J1748-288 ACIS-S HETG 40.00 17:48:05.10 -28:28:25.80 XTE J1748-288 ACIS-S HETG 70.00 =================================================================================== Proposal Number: 06400656 Proposal Title: Follow-up Chandra observation of 4U 1705-44 PI: Tiziana Di Salvo Subject Category: BH AND NS BINARIES Abstract: We propose Chandra/HETGS observations of the bright atoll source 4U 1705-44 for 30 ks, to perform a detailed study of the iron K-shell features. A first Chandra observation of this source shows the presence of an iron Kalpha line at 6.6 keV, that is found to be intrinsically broad (FWHM about 1.7 keV) and with a complex profile. Although very interesting, these results need to be confirmed by a follow-up Chandra observation. This is due to the fact that during the first observation the source was very bright; although the pile up in the HEG spectra was still negligible, this unexpectedly resulted in small systematic differences between the +1 and -1 orders spectra. We therefore propose to re-observe this source using instrumental modes more appropriate for such a bright source. Grat- Exp. R.A. Dec. (J2000) Target Name Det. ing Time ----------------------------------------------------------------------------------- 17:08:55.00 -44:06:00.00 4U 1705-44 ACIS-S HETG 30.00 =================================================================================== Proposal Number: 06400710 Proposal Title: Spectral and Temporal Studies of the X-ray Emission from the Double Pulsar Binary System J0737-3039 PI: Maura McLaughlin Subject Category: BH AND NS BINARIES Abstract: Our 10-ks DDT observation of the first known double pulsar system showed it to be easily detectable, with a spectrum that can be fit by a steep power-law. However, the small number of detected photons prohibited detailed studies of the spectrum and variability. We therefore request more sensitive observations with both ACIS-S and HRC-S. These will allow us to discriminate between various possible models for the X-ray emission and constrain the extreme interaction between the two pulsars. Grat- Exp. R.A. Dec. (J2000) Target Name Det. ing Time ----------------------------------------------------------------------------------- 07:37:51.30 -30:39:40.70 J0737-3039 ACIS-S NONE 80.00 =================================================================================== Proposal Number: 06400851 Proposal Title: X-ray Binaries in the Ultrahigh Collision Rate Globular Cluster NGC 6388 PI: Haldan Cohn Subject Category: BH AND NS BINARIES Abstract: We propose a joint Chandra-HST study of the massive, high density globular cluster NGC 6388 to study its large expected populations of quiescent low-mass X-ray binaries (qLMXBs) and bright cataclysmic variables (CVs), and to test for the presence of an intermediate-mass black hole (IMBH). NGC 6388 has the highest predicted X-ray binary production rate of any Galactic cluster. The qLMXBs will be used to constrain neutron star accretion models, and neutron star masses and radii. The CVs will be used to investigate the effects of cluster structure, metallicity, initial binary fraction, and dynamical history on accreting binary populations. The proposed 3 orbits of HST U-band imaging would complement deep HST V and I-band imaging, already in-hand, for identifying Chandra sources. Grat- Exp. R.A. Dec. (J2000) Target Name Det. ing Time ----------------------------------------------------------------------------------- 17:36:17.00 -44:44:06.00 NGC 6388 ACIS-S NONE 50.00 =================================================================================== Proposal Number: 06400876 Proposal Title: Probing the X-ray Emission from Dueling Magnetospheres PI: Shamibrata Chatterjee Subject Category: BH AND NS BINARIES Abstract: The double pulsar system J0737-3039 may provide answers to longstanding questions about the pulsar emission mechanism and the physics of relativistic winds. X-ray emission detected with Chandra could be produced by pulsed magnetospheric emission or at termination shocks located at the wind-wind boundary or the wind-ISM boundary. We propose high time resolution observations with HRC-S which will determine the X-ray modulation fraction at the pulsar rotational and orbital periods, thus distinguishing between the various possibilities and providing direct constraints on the magnetization parameter of the relativistic wind. Grat- Exp. R.A. Dec. (J2000) Target Name Det. ing Time ----------------------------------------------------------------------------------- 07:37:51.30 -30:39:40.70 PSR J0737-3039 HRC-S NONE 89.00 =================================================================================== Proposal Number: 06400892 Proposal Title: Precise Localization of Neutron Star Soft X-ray Transients PI: Deepto Chakrabarty Subject Category: BH AND NS BINARIES Abstract: We propose to observe four neutron star (NS) soft X-ray transients (SXT) in outburst to obtain accurate source positions. This study will allow us to reobserve these sources in future cycles to study the quiescent X-ray emission in NS SXTs. New results from Chandra and XMM suggest that the standard picture of NS SXT emission may not be as straightforward as previously thought. This proposal will increase the number of known NS SXTs with good positions, providing a more uniform sample of the population for future work. Grat- Exp. R.A. Dec. (J2000) Target Name Det. ing Time ----------------------------------------------------------------------------------- NS SXT HRC-S NONE 1.00 NS SXT HRC-S NONE 1.00 NS SXT HRC-S NONE 1.00 NS SXT HRC-S NONE 1.00 =================================================================================== Proposal Number: 06400898 Proposal Title: Measuring Dense Clouds with X-rays and Millimeter Waves PI: Randall Smith Subject Category: BH AND NS BINARIES Abstract: Interstellar (IS) dust grains are a difficult puzzle for astronomers, but we can make significant strides by correlating high-resolution X-ray observations with velocity-resolved CO maps to probe dense molecular clouds, where previously only far-infrared data existed. We propose a small survey of moderately bright, moderately absorbed sources to measure their X-ray halos. We have chosen sources for which we have CO observations and which will have a detectable halo while not severely piling up the ACIS detectors. By constraining the dust models using the grain positions known from the CO measurements of molecular clouds, we will be able to measure total gas and dust masses as well as directly measuring coagulation or "mantling" inside dense clouds. Grat- Exp. R.A. Dec. (J2000) Target Name Det. ing Time ----------------------------------------------------------------------------------- 17:24:20.10 -30:45:39.00 X1724-307 ACIS-I NONE 25.00 =================================================================================== Proposal Number: 06401081 Proposal Title: Detailed Studies of the Jets in SS 433 PI: Claude Canizares Subject Category: BH AND NS BINARIES Abstract: From previous HETGS observations of SS 433, we modeled the X-ray emission from the jets by an optically thin plasma with abundances slightly higher than solar, obtaining the jet density and temperature structure in an abdiabatic cooling model. In an eclipse observation, the coolest part of the receding jet was blocked by the companion, so we inferred the size of the companion. With the proposed observations, we plan to a) extend the density diagnostics to higher densities, b) verify the adiabatic expansion model with the metallicity assumption with more signal in Ar and Ca lines, c) test for deceleration, fragmentation, and jet direction changes by comparing to optical and radio data, d) test the eclipse model, and e) search for more evidence of photoionization. Grat- Exp. R.A. Dec. (J2000) Target Name Det. ing Time ----------------------------------------------------------------------------------- 19:11:49.50 +04:58:58.00 SS 433 ACIS-S HETG 20.00 19:11:49.50 +04:58:58.00 SS 433 ACIS-S HETG 50.00 19:11:49.50 +04:58:58.00 SS 433 ACIS-S HETG 130.00

*********************************************************************************** SN, SNR AND ISOLATED NS -------------------------------------------------- =================================================================================== Proposal Number: 06500014 Proposal Title: The Surface Temperature of Isolated Neutron Stars PI: Stephen Murray Subject Category: SN, SNR AND ISOLATED NS Abstract: Details of the interior structures of neutron stars remain poorly understand. In the early stages of their lives, energy loss in neutron stars is dominated by neutrino emission, but the neutrino emission rate depends critically on the physical properties of hadrons at high densities. Since the neutrino luminosity controls the rate at which the star cools, measurements of the surface temperature for neutron stars of known age can probe the physics of neutron star interiors. We here propose a high-time resolution observation of PSR B1509-58, for which the off-pulse emission can provide a direct constraint on the neutron star temperature. This HRC image will provide no spectral information, and so is not in conflict with any ACIS observation of this same source. Grat- Exp. R.A. Dec. (J2000) Target Name Det. ing Time ----------------------------------------------------------------------------------- 15:13:55.60 -59:08:09.00 PSR B1509-58 HRC-I NONE 45.00 =================================================================================== Proposal Number: 06500020 Proposal Title: Spatial extent and spectrum of the X-ray DC component of millisecond pulsar PSR B1937+21 PI: Mariano Mendez Subject Category: SN, SNR AND ISOLATED NS Abstract: We propose to observe millisecond pulsar PSR B1937+21 for 50 ks with the ACIS-S in order to obtain a high-resolution X-ray image and an accurate (total) X-ray spectrum. BeppoSAX observations of PSR B1937+21 revealed an unresolved ~40% DC component below 4 keV. In addition, the total spectrum of BeppoSAX appeared to be much softer than the pulsed spectrum. The apparently soft/thermal(?) DC component could not be well constrained, and might be due to emission from a heated polar cap by along the magnetic field back flowing particles, or due to an underlying pulsar wind nebula. With a Chandra ACIS-S observation it is possible to resolve this ambiguity, and significantly better spectral information can be obtained for either interpretation. Grat- Exp. R.A. Dec. (J2000) Target Name Det. ing Time ----------------------------------------------------------------------------------- 19:39:38.60 +21:34:59.10 PSR B1937+21 ACIS-S NONE 50.00 =================================================================================== Proposal Number: 06500042 Proposal Title: Galactic Supernova Remnant G299.2-2.9 PI: Gordon Garmire Subject Category: SN, SNR AND ISOLATED NS Abstract: We propose to observe a Galactic supernova remnant G299.2-2.9 in order to resolve the bright X-ray knot and the fine scale blast wave shock structure. Grat- Exp. R.A. Dec. (J2000) Target Name Det. ing Time ----------------------------------------------------------------------------------- 12:15:33.80 -65:26:33.90 G299.2-2.9 ACIS-S NONE 30.00 =================================================================================== Proposal Number: 06500051 Proposal Title: X-ray Emission from Radio Pulsars PI: Gordon Garmire Subject Category: SN, SNR AND ISOLATED NS Abstract: We propose exploratory Chandra ACIS observations of two well-known nearby radio pulsars, B1257+12 and B1133+16. PSR 1257+12 is the famous millisecond pulsar with a planetary system, while PSR B1133+16 is a radio-bright nulling pulsar. These pulsars have not been observed with Chandra or XMM, and only shallow limits were found from short ROSAT observations. The immediate objective of the proposed observations is to detect the pulsars, estimate their X-ray fluxes, and crudely characterize their spectra. If the detected X-ray emission is bright enough, we will propose longer follow-up observations for phase-resolved spectroscopy. Grat- Exp. R.A. Dec. (J2000) Target Name Det. ing Time ----------------------------------------------------------------------------------- 11:36:03.30 +15:51:00.70 PSR B1133+16 ACIS-S NONE 20.00 13:00:03.00 +12:40:57.30 PSR B1257+12 ACIS-S NONE 20.00 =================================================================================== Proposal Number: 06500063 Proposal Title: Double Neutron Star Binary with PSR J1537+1155 PI: Gordon Garmire Subject Category: SN, SNR AND ISOLATED NS Abstract: We propose to observe a nearby double neutron star (DNS) binary that contains the recycled pulsar J1537+1155. This will allow us to measure the luminosity and spectrum of the X-ray emission from the millisecond pulsar and the relativistic wind in the binary. Grat- Exp. R.A. Dec. (J2000) Target Name Det. ing Time ----------------------------------------------------------------------------------- 15:37:10.00 +11:55:55.50 PSR J1537+1155 ACIS-S NONE 36.00 =================================================================================== Proposal Number: 06500081 Proposal Title: Observations of a Bright GRB PI: Gordon Garmire Subject Category: SN, SNR AND ISOLATED NS Abstract: During Cycle 6, we propose time critical Chandra observations of a very bright gamma-ray burst discovered by HETE, with a fluence of >10^-4 ergs cm-2. HETE has detected one such burst in 3.5 years, so we estimate a probability of 0.3 of observing such an event during Cycle 6. We will search for X-ray spectral lines in such an event, using either ACIS-S/LETG for z<1, or ACIS-S/HETG for z>1, in a 100 ksec observation. The existence of such putative lines is an outstanding question: if real, they can reveal the circumburst chemical composition and geometry. The shape of the decay curve, including any absorption changes, will also bear critically upon the circumburst environment. The Chandra observations will be carried out as soon as is practical (4-12 days after the GRB). Grat- Exp. R.A. Dec. (J2000) Target Name Det. ing Time ----------------------------------------------------------------------------------- TOO #1 ACIS-S HETG 100.00 =================================================================================== Proposal Number: 06500250 Proposal Title: The origin of X-ray rich Gamma-Ray Bursts: Beacons in the Dark High-z Universe? PI: Luigi Piro Subject Category: SN, SNR AND ISOLATED NS Abstract: X-ray rich GRBs (a.k.a. X-ray Flash, XRFs) constitute a significant fraction ($\approx 50\%$) of the population of "standard" long GRB. This class could hide some of the long-sought members of high-z GRB. For an event at $z>5$, the peak of the gamma-ray emission and the absorption by Ly$\alpha$ forest clouds would be redshifted into the X-ray and the optical bands respectively. Thus, a high-z GRB would appear as a {\it optically dark X-ray rich GRB}. They could also be a new type of cosmic explosion, likely similar to a GRB, but in which the fireball expansion is mildly relativistic due to higher fraction of baryon mass entrained in the shell ("dirty" fireball). We propose to follow-up with Chandra/ACIS two of these events identified either by SWIFT, HETE-2 or INTEGRAL. Grat- Exp. R.A. Dec. (J2000) Target Name Det. ing Time ----------------------------------------------------------------------------------- GRB TOO ACIS-S NONE 60.00 =================================================================================== Proposal Number: 06500265 Proposal Title: Timing the Enigmatic Nearby Neutron Star RX J1308.8+2127 PI: David Kaplan Subject Category: SN, SNR AND ISOLATED NS Abstract: The nearest neutron stars identified by their thermal X-ray emission provide us the best sample to measure the true demography of neutron stars. The bright soft X-ray source RX J1308.8+2127, with a period of 10-s and a double-peaked pulse profile, is distinguished from both traditional radio pulsars and from other radio-quiet neutron stars. Current data allow 3 models: a pulsar born with the unexpectedly long period of 10 s; a remarkably high B-field (1e13 G) pulsar; or an old magnetar with an even higher magnetic field. The period derivative provides a clean and clear discriminant of the models. We propose an optimally designed set of timing observations which, when combined with existing data, will choose between these models and thus resolve the nature of this source. Grat- Exp. R.A. Dec. (J2000) Target Name Det. ing Time ----------------------------------------------------------------------------------- 13:08:48.30 +21:27:06.80 RX J1308.8+2127 ACIS-S NONE 5.00 13:08:48.30 +21:27:06.80 RX J1308.8+2127 ACIS-S NONE 5.00 13:08:48.30 +21:27:06.80 RX J1308.8+2127 ACIS-S NONE 5.00 13:08:48.30 +21:27:06.80 RX J1308.8+2127 ACIS-S NONE 5.00 13:08:48.30 +21:27:06.80 RX J1308.8+2127 ACIS-S NONE 5.00 13:08:48.30 +21:27:06.80 RX J1308.8+2127 ACIS-S NONE 5.00 13:08:48.30 +21:27:06.80 RX J1308.8+2127 ACIS-S NONE 15.00 13:08:48.30 +21:27:06.80 RX J1308.8+2127 ACIS-S NONE 15.00 =================================================================================== Proposal Number: 06500281 Proposal Title: Small-Diameter Galactic Supernova Remnants: The Missing Young Remnants? PI: Stephen Reynolds Subject Category: SN, SNR AND ISOLATED NS Abstract: We propose to study four small-diameter Galactic supernova remnants (SNRs) with well-defined radio shells suggestive of young age, and high radio surface brightness. Chandra observations should provide reliable ages, and show if these remnants really are young and can help fill the gap between inferred SN rates and known young SNRs. None of these objects has been previously resolved in X-rays, though 3 have been detected. We expect to obtain between 4000 and 30000 counts per remnant, sufficient for moderate to high-resolution imaging and spatially resolved spectroscopy. We should be able to identify shell emission, and obtain ages; identify central emission, discriminate possible pulsar-wind nebulae or compact objects, and characterize ejecta emission if present. Grat- Exp. R.A. Dec. (J2000) Target Name Det. ing Time ----------------------------------------------------------------------------------- 18:18:53.70 -15:01:14.00 G15.9+0.2 ACIS-S NONE 30.00 =================================================================================== Proposal Number: 06500291 Proposal Title: X-RAY IMAGING OF PULSAR BOW SHOCKS PI: Bryan Gaensler Subject Category: SN, SNR AND ISOLATED NS Abstract: Pulsar bow shocks provide a laboratory for studying non-thermal particle populations and shocks under a particularly well-defined geometry. Using Chandra data on "the Mouse", we have recently carried out the first detailed X-ray study of a pulsar bow shock, and have directly identified both the termination shock plus structures in the downstream flow. We now need to compare these results to other sources, and thus propose Chandra observations of two more pulsar bow shocks which possibly contain complicated nebular structure. These data can test our model for the Mouse, allowing us to establish which theories developed for "Crab-like" nebulae are equally valid for bow shocks, and to correspondingly focus new theoretical efforts on ways in which these systems may differ from the Crab. Grat- Exp. R.A. Dec. (J2000) Target Name Det. ing Time ----------------------------------------------------------------------------------- 06:17:05.20 +22:21:26.70 CXOU J061705.3+22212 ACIS-S NONE 38.00 =================================================================================== Proposal Number: 06500305 Proposal Title: The Oxygen-Rich SNR N132D: Ejecta Detection and Chemical Abundances PI: Kazimierz Borkowski Subject Category: SN, SNR AND ISOLATED NS Abstract: N132D is the brightest supernova remnant in the Large Magellanic Cloud, with oxygen-rich filamentary ejecta detected in the optical at its center. O-rich remnants originate in explosions of massive stars, in this case 30-35 solar masses. Several solar masses of O-rich ejecta are then expected, and indeed available Chandra data hint at the central O overabundance. We propose a deep 100 ksec ACIS-S/S3 observation in order to detect and study supernova ejecta, and determine their chemical composition. An equally important objective is to study chemical abundances in the ambient shocked interstellar medium. The X-ray derived chemical abundances will be useful in modeling X-ray spectra of other supernova remnants in the LMC, and they will be of general interest to the astronomical community. Grat- Exp. R.A. Dec. (J2000) Target Name Det. ing Time ----------------------------------------------------------------------------------- 05:25:02.10 -69:38:30.00 N132D ACIS-S NONE 100.00 =================================================================================== Proposal Number: 06500327 Proposal Title: A Search for the X-ray counterpart of the Unidentified Gamma-Ray source 3EG J2020+4017 PI: Martin Weisskopf Subject Category: SN, SNR AND ISOLATED NS Abstract: The nature of the unidentified gamma-ray source 2CG078+2, which appears to be in the center of the SNR G78.2+2.1 has remained a mystery since its discovery in the mid 70's with COS-B. Even the much more sensitive observation with EGRET has not resolved the puzzle. Although its gamma-ray emission properties strongly argue for a Geminga-like radio-silent neutron star, this is only a working hypothesis. ROSAT observations of the remnant had discovered a possible X-ray counterpart which we pursued in Cycle-4. However, the Chandra position of the putative counterpart firmly established that the ROSAT source was not the Gamma-ray source. We follow that work with this proposal for a 15 ksec ACIS-I observation, centered on the best EGRET position, and not covered in the previous observation. Grat- Exp. R.A. Dec. (J2000) Target Name Det. ing Time ----------------------------------------------------------------------------------- 20:21:01.00 +40:17:48.00 3EG J2020+4017 ACIS-I NONE 15.00 =================================================================================== Proposal Number: 06500333 Proposal Title: The Structure and Composition of Pulsar Winds and their Nebulae PI: Patrick Slane Subject Category: SN, SNR AND ISOLATED NS Abstract: Chandra studies of pulsar wind nebulae have revealed stunning new information on the composition of the winds, the presence of jets and equatorial outflows, and the structure in and around the wind termination shock. Monitoring observations reveal temporal variations in resolved structures that challenge our understanding of particle acceleration and energy flow in these systems. Here we propose deep observations of G54.1+0.3 and PSR B1509-58 in order to probe the complex structure in their interior regions at arcsecond resolution. These observations will allow us to measure the spectrum and morphology of these features in order to constrain models for particle acceleration, the formation and structure of jets, and the geometry of particle flows in PWNe. Grat- Exp. R.A. Dec. (J2000) Target Name Det. ing Time ----------------------------------------------------------------------------------- 15:13:55.60 -59:08:08.90 PSR B1509-58 ACIS-I NONE 47.50 15:13:55.60 -59:08:08.90 PSR B1509-58 ACIS-I NONE 47.50 15:13:55.60 -59:08:08.90 PSR B1509-58 ACIS-I NONE 47.50 15:13:55.60 -59:08:08.90 PSR B1509-58 ACIS-I NONE 47.50 =================================================================================== Proposal Number: 06500351 Proposal Title: Probing the nature of Dark GRBs using Swift and Chandra in Synergy PI: Chryssa Kouveliotou Subject Category: SN, SNR AND ISOLATED NS Abstract: While most GRBs have X-ray counterparts, only in about half of them have radio and optical afterglows been found. There exists among these followed-up GRBs, a handful of events without optical counterparts, albeit with very faint optical limits. These have been loosely called dark GRBs, and are quite likely a medley of cases, with some of the optical counterparts being intrinsically very faint, some highly reddened or redshifted, and some simply missed due to adverse observing conditions. We propose to perform a 60 ks Chandra ToO observation of one such dark GRB, selected with a synergy of all instruments onboard Swift. Our goal is to determine the true origin of the phenomenon and shed light on GRB progenitors and their environments. Grat- Exp. R.A. Dec. (J2000) Target Name Det. ing Time ----------------------------------------------------------------------------------- GRB ACIS-S NONE 60.00 =================================================================================== Proposal Number: 06500381 Proposal Title: RX J193214.6+300741: A young supernova remnant in a low density medium? PI: Fangjun Lu Subject Category: SN, SNR AND ISOLATED NS Abstract: X J193214.6+300741 is an intriguing small circular X-ray emitting feature in the Galaxy. The angular size (2.4 arcmin diameter) at a relatively high Galactic latitude of 5.3 degree suggests a small diameter of 7 pc $d_{10}$, where $d_{10}$ is the distance in units of 10 kpc. This diameter, together with the relatively hard ROSAT PSPC spectrum, indicates that the source is a very young supernova remnant. We propose a 40~ks Chandra ACIS-S observation to obtain a high-resolution image and a high-quality spectrum of this circular feature, in order to tightly constrain its physical parameters and thereby unveil its true nature. Grat- Exp. R.A. Dec. (J2000) Target Name Det. ing Time ----------------------------------------------------------------------------------- 19:32:14.60 +30:07:41.00 RX J193214.6+300741 ACIS-S NONE 40.00 =================================================================================== Proposal Number: 06500389 Proposal Title: The PWN Torus of PSR J0538+2817: a stringent test of kick models PI: Roger Romani Subject Category: SN, SNR AND ISOLATED NS Abstract: An ACIS exposure of PSR J0538+2817 in S147 can powerfully test the origin of pulsar birth kicks. This is because the pulsar has the longest initial spin period of any radio pulsar/SNR presently known, yet the faint wind nebula that we discovered in a short AO3 exposure shows symmetry, marking the neutron star spin axis, well aligned with the proper motion vector. Our predicted large birth period and proper motion now have a pulsar timing confirmation. We have a VLBA campaign underway that will provide a high precision velocity vector (and distance). A sensitive ACIS exposure can complete the test, confirming the modeled PWN structure and measuring the symmetry axis with comparable precision. The resulting spin-kick angle measurement can rule out many popular models for the birth kick. Grat- Exp. R.A. Dec. (J2000) Target Name Det. ing Time ----------------------------------------------------------------------------------- 05:38:25.00 +28:17:08.80 PSR J0538+2817 ACIS-I NONE 100.00 =================================================================================== Proposal Number: 06500393 Proposal Title: High-Resolution Soft X-ray Spectroscopy of a Gamma-ray Burst X-ray Afterglow PI: Masao Sako Subject Category: SN, SNR AND ISOLATED NS Abstract: We propose a deep TOO observation of a bright X-ray afterglow of a gamma-ray burst using the Chandra LETG/ACIS-S. The trigger will be based primarily on the amount of X-ray variability observed during it's early afterglow phases, which will be monitored with the X-ray Telescope onboard the Swift satellite. Additional constraints including X-ray flux and line-of-sight Galactic column density will be imposed as well to provide the highest statistical-quality grating spectrum of a GRB X-ray afterglow. These criteria, which is based on our detailed study of the currently-available datasets in the archive, maximizes the chances of detecting and identifying discrete X-ray features from the circumburst environment, which will provide us with important clues about the nature of the progenitor. Grat- Exp. R.A. Dec. (J2000) Target Name Det. ing Time ----------------------------------------------------------------------------------- GRB TOO ACIS-S LETG 120.00 =================================================================================== Proposal Number: 06500479 Proposal Title: Astrometric study of isolated neutron stars PI: Christian Motch Subject Category: SN, SNR AND ISOLATED NS Abstract: We propose to take advantage of the excellent imaging performance of Chandra to measure the proper motions of two X-ray "dim" isolated neutron stars discovered by ROSAT and lacking optical identification. We shall obtain discriminating information on the X-ray powering mechanism and if proper motion is detected, shall constrain their space velocity and place of birth. This proposal is the "second epoch" part of a project started in Chandra Cycle 3 by our group. Grat- Exp. R.A. Dec. (J2000) Target Name Det. ing Time ----------------------------------------------------------------------------------- 04:20:01.90 -50:22:48.10 RX J0420.0-5022 ACIS-S NONE 20.00 08:06:23.40 -41:22:30.90 RX J0806.4-4123 ACIS-I NONE 20.00 =================================================================================== Proposal Number: 06500496 Proposal Title: Search for Sub-Millisecond Pulsars in 47 Tuc PI: Robert Rutledge Subject Category: SN, SNR AND ISOLATED NS Abstract: We propose an observation with the ability to detect multiple isolated sub-millisecond pulsars among the unidentified X-ray sources in 47 Tuc, with significant secondary science. Observations in the X-ray band overcome the limited time resolution of even the best radio observations, allowing for the first time the setting of a new ``speed record'' for pulsars at sub-ms periods, below the now 20-year-old record of P = 1.558 ms. The detection of sub-ms pulsars would rule out equations of state for dense matter, provide even better clocks for their many physics applications, and create a strong impetus for future improvement of observational techniques. The absence of sub-ms pulsars would provide compelling evidence for a spin period limit. Grat- Exp. R.A. Dec. (J2000) Target Name Det. ing Time ----------------------------------------------------------------------------------- 00:24:05.20 -72:04:49.90 47 Tuc HRC-S NONE 120.00 00:24:05.20 -72:04:49.90 47 Tuc HRC-S NONE 170.00 00:24:05.20 -72:04:49.90 47 Tuc HRC-S NONE 170.00 00:24:05.20 -72:04:49.90 47 Tuc HRC-S NONE 170.00 00:24:05.20 -72:04:49.90 47 Tuc HRC-S NONE 170.00 =================================================================================== Proposal Number: 06500531 Proposal Title: A Young Pulsar Candidate on the Galactic Plane PI: DAVID HELFAND Subject Category: SN, SNR AND ISOLATED NS Abstract: A new continuum survey of the Galactic Plane using the VLA at 20cm is providing images with a fifty-fold improvement in sensitivity and angular resolution over existing single-dish maps of the plane. Three square degrees of the survey area has been covered by XMM snapshot observations which have revealed an intriguing hard X-ray source coincident with a radio point source and surrounded by a very low surface brightness radio shell -- a classic candidate for a young radio pulsar. We propose to image this source with Chandra in order to provide an accurate position for followup in the crowded Galactic Plane and to resolve any surrounding PWN that is to be expected around a young pulsar. Grat- Exp. R.A. Dec. (J2000) Target Name Det. ing Time ----------------------------------------------------------------------------------- 18:30:38.10 -10:02:49.00 G21.6-0.0 ACIS-S NONE 20.00 =================================================================================== Proposal Number: 06500653 Proposal Title: The Structure and Spectrum of W44 s Pulsar Wind Nebula PI: Robert Petre Subject Category: SN, SNR AND ISOLATED NS Abstract: The evolved SNR W44 contains the oldest known Pulsar Wind Nebula (PWN) with an active pulsar. The PWN is an important evolutionary link between younger pulsars in PWNe (like the Crab) and the large population of radio pulsars. An off-axis ACIS observation provided the first image of the PWN, and allowed measurement of the spectral index of the pulsar and nebula. The poor resolution afforded only an upper limit for the termination shock radius, and precluded study of the interaction between the PWN and the surrounding gas. We propose a deep, on-axis ACIS-S observation to provide a clear view of the pulsar and PWN, and perform spectroscopy over more regions. We will obtain refined values of PWN parameters, and better understand its evolution and interaction with its environment. Grat- Exp. R.A. Dec. (J2000) Target Name Det. ing Time ----------------------------------------------------------------------------------- 18:56:10.80 +01:13:21.00 W44 PWN ACIS-S NONE 100.00 =================================================================================== Proposal Number: 06500694 Proposal Title: A Deep Chandra Observation of O-Rich SNR 0540-69.3 in the LMC PI: Sangwook Park Subject Category: SN, SNR AND ISOLATED NS Abstract: We propose a deep Chandra/ACIS observation of an oxygen-rich supernova remnant (SNR) 0540-69.3 in the Large Magellanic Cloud (LMC). O-rich SNRs provide a useful laboratory for the study of core-collapse SN nucleosynthesis and thus have been intensively studied in X-rays. SNR 0540-69.3 is however a noteworthy exception: i.e., the X-ray studies of 0540-69.3 has been only preliminary and some results were even controversial between Chandra and XMM-Newton. The proposed deep observation with the high angular resolution Chandra/ACIS would be the unique opportunity for an extensive spatio-spectral analysis of 0540-69.3. Grat- Exp. R.A. Dec. (J2000) Target Name Det. ing Time ----------------------------------------------------------------------------------- 05:40:11.20 -69:19:55.10 SNR 0540-69.3 ACIS-S NONE 120.00 =================================================================================== Proposal Number: 06500699 Proposal Title: Monitoring of the Relativistic Magnetohydrodynamic Shock in the Crab Nebula PI: KOJI MORI Subject Category: SN, SNR AND ISOLATED NS Abstract: We propose monitoring observations of the Crab Nebula with an instrumental setup which suppresses event pile-up (i.e, inserting grating and adopting short frame time) and will allow us for the first time to perform a spectroscopic study of the variable inner ring and the wisps emerging outward from the ring. Both the inner ring and the wisps are related to a magnetohydrodynamic shock where the pulsar wind is terminated, randomized, and converted into the pulsar wind nebula. Thus, it is crucial to derive the spectral properties as well as the dynamic properties for understanding of a formation mechanism of the pulsar wind nebula. Grat- Exp. R.A. Dec. (J2000) Target Name Det. ing Time ----------------------------------------------------------------------------------- 05:34:31.70 +22:00:59.30 The Crab Nebula ACIS-S HETG 14.44 05:34:31.70 +22:00:59.30 The Crab Nebula ACIS-S HETG 14.44 05:34:31.70 +22:00:59.30 The Crab Nebula ACIS-S HETG 14.44 05:34:31.70 +22:00:59.30 The Crab Nebula ACIS-S HETG 14.44 05:34:31.70 +22:00:59.30 The Crab Nebula ACIS-S HETG 14.44 05:34:31.70 +22:00:59.30 The Crab Nebula ACIS-S HETG 14.44 05:34:31.70 +22:00:59.30 The Crab Nebula ACIS-S HETG 14.44 05:34:31.70 +22:00:59.30 The Crab Nebula ACIS-S HETG 14.44 05:34:33.70 +22:00:59.30 The Crab Nebula ACIS-S HETG 14.44 =================================================================================== Proposal Number: 06500734 Proposal Title: Accurate localization of the CCO candidate in SNR G347.3-0.5 PI: Jasmina Lazendic Subject Category: SN, SNR AND ISOLATED NS Abstract: The nature of the compact central objects (CCOs) within supernova remnants is still a puzzle, and identifying new examples can provide vital clues as to what these sources could be. 1WGA J1713.4-3949 may be a CCO associated with the remnant G347.3-0.5. We propose observations with Chandra to obtain an accurate position for 1WGA J1713.4-3949, to enable deep searches for its optical/NIR counterpart and establish whether this source is a new addition to the small sample of CCOs in supernova remnants. Grat- Exp. R.A. Dec. (J2000) Target Name Det. ing Time ----------------------------------------------------------------------------------- 17:13:28.80 -39:49:51.60 1WGA J1713.4-3949 ACIS-I NONE 10.00 =================================================================================== Proposal Number: 06500795 Proposal Title: Searching for spectral and morphological changes of X-ray structures in SNR RX J1713.7-3946 PI: Yasunobu Uchiyama Subject Category: SN, SNR AND ISOLATED NS Abstract: We propose a monitoring observation of the northwest rim of the RX J1713.7-3946, 5-years after the first Chandra observation, as well as a follow-up observation of the southwest rim. The principal aim of this proposal is to find changes in the synchrotron X-ray image and intensity of the filaments and hotspots caused by proper motion and possibly by rapid synchrotron cooling of multi-TeV electrons responsible for X-ray emission. Only Chandra can achieve the proper motion measurement owing to its spectacular spatial resolution. Grat- Exp. R.A. Dec. (J2000) Target Name Det. ing Time ----------------------------------------------------------------------------------- 17:11:38.90 -39:56:42.10 RX J1713.7-3946 SW ACIS-I NONE 30.00 17:11:45.50 -39:33:23.20 RX J1713.7-3946 NW ACIS-I NONE 30.00 =================================================================================== Proposal Number: 06500799 Proposal Title: A Chandra Study of the Interaction between the Plasma Nebula RCW89 and the pulsar jet of PSR B1509-58 PI: Yoichi Yatsu Subject Category: SN, SNR AND ISOLATED NS Abstract: RCW89 is part of the supernova remnant G320.4-01.2 with the young pulsar PSR B1509-58 accompanied by the pulsar wind nebula and jet features. Since RCW89 is located at the terminus of the jet, it has been suggested that the plasma nebulae are powered by the precessing pulsar-jet. In order to determine the dynamics of pulsar jets and the secular change of plasma nebula, we will compare this observation with the past Chandra data of this region on Aug 14, 2000. Grat- Exp. R.A. Dec. (J2000) Target Name Det. ing Time ----------------------------------------------------------------------------------- 15:13:34.50 -59:02:47.00 RCW89 ACIS-S NONE 30.00 =================================================================================== Proposal Number: 06500831 Proposal Title: G20.0-0.2: REVEALING A MODEST CRAB-LIKE SUPERNOVA REMNANT PI: DAVID HELFAND Subject Category: SN, SNR AND ISOLATED NS Abstract: We propose to observe the bright Crab-like radio supernova remnant G20.0-0.2 with Chandra. This center-filled remnant was only recently detected in X-rays, serendipitously in a very short (few~ks) XMM-Newton observation, well off-axis. The goal is to locate and obtain a spectrum of the putative pulsar and of its pulsar wind nebula. This will add another precious example of a newly born neutron star to the census. Given that the birth properties of neutron stars provide unique and critical information on the process of stellar core collapse and the heavy element nucleosynthesis which accompanies it, each hard fought example represents an important addition. Grat- Exp. R.A. Dec. (J2000) Target Name Det. ing Time ----------------------------------------------------------------------------------- 18:28:10.60 -11:35:40.80 G20.0-0.2 ACIS-S NONE 35.00 =================================================================================== Proposal Number: 06500837 Proposal Title: Large-Scale Shock Interactions in Puppis A PI: Una Hwang Subject Category: SN, SNR AND ISOLATED NS Abstract: The Puppis A supernova remnant is interacting with interstellar clouds along its eastern border. The brightest feature in the remnant (the Bright Eastern Knot) is a recently shock interstellar cloud, while a large HI and CO cloud abuts the remnant's entire eastern border to the north. Existing Chandra X-ray observations of small, isolated fields in this region reveal spectral structures that involve a complicated mixture of temperature, ionization, and column density effects. We propose five mosaicked ACIS-I observations of the entire eastern region to obtain a global picture of the shock interaction. Grat- Exp. R.A. Dec. (J2000) Target Name Det. ing Time ----------------------------------------------------------------------------------- 08:23:32.30 -42:46:42.20 Puppis A NE Shock Fr ACIS-I NONE 65.00 =================================================================================== Proposal Number: 06500846 Proposal Title: X-ray Bursts from Anomalous X-ray Pulsars PI: VICTORIA KASPI Subject Category: SN, SNR AND ISOLATED NS Abstract: Recently the magnetar model for anomalous X-ray pulsars (AXPs) was given a significant deciding boost by the discovery of Soft-Gamma-Repeater-like bursts from AXPs. However, the basic energetics and radiative behavior of magnetar outbursts is suprisingly diverse given the very few such events observed. Understanding this puzzle is important as outbursts hold tremendous promise for constraining the physics of magnetars and neutron-star structure in general. We request Chandra TOO observations following the next two AXP outbursts in order to study the evolution of magnitude and spectrum of the pulsed and persistent emission, and, if necessary, verify the identity of the burster. Grat- Exp. R.A. Dec. (J2000) Target Name Det. ing Time ----------------------------------------------------------------------------------- Anomalous X-ray Puls ACIS-S NONE 20.00 Anomalous X-ray Puls ACIS-S NONE 20.00 Anomalous X-ray Puls ACIS-S NONE 20.00 Anomalous X-ray Puls ACIS-S NONE 20.00 Anomalous X-ray Puls ACIS-S NONE 20.00 Anomalous X-ray Puls ACIS-S NONE 20.00 Anomalous X-ray Puls ACIS-S NONE 20.00 Anomalous X-ray Puls ACIS-S NONE 20.00 =================================================================================== Proposal Number: 06500886 Proposal Title: IS SGR 1627-41 A DIM ISOLATED NEUTRON STAR? PI: Chryssa Kouveliotou Subject Category: SN, SNR AND ISOLATED NS Abstract: We propose a series of three monitoring observations of the persistent emission from SGR1627-41 with CXO, to study the evolution of its persistent flux emission. A source detection (at a constant or a decaying trend) would probe heating and cooling dynamics of magnetars at a far more sensitive level than has been done in the past. An upper limit of 6.3x10e(-15) erg/cm^2 s would imply that its persistent emission is more than 1000 times lower than that of typical magnetars and would identify the tip of a much larger `iceberg' of magnetars that have escaped detection until now; our observations may even provide the first direct link between SGRs and Dim Isolated Neutron Stars (whose luminosities SGR1627-41 seems to be approaching pretty fast). Grat- Exp. R.A. Dec. (J2000) Target Name Det. ing Time ----------------------------------------------------------------------------------- 16:35:51.80 -47:35:23.30 SGR 1627-41 ACIS-S NONE 6.67 16:35:51.80 -47:35:23.30 SGR 1627-41 ACIS-S NONE 6.67 16:35:51.80 -47:35:23.30 SGR 1627-41 ACIS-S NONE 6.67 =================================================================================== Proposal Number: 06500899 Proposal Title: Catching a Bright Swift Gamma-Ray Burst With Chandra PI: James Reeves Subject Category: SN, SNR AND ISOLATED NS Abstract: In this proposal we request a 100ks Chandra-LETG TOO observation of one bright Gamma-ray burst, to be detected in the first year of operations of NASA's dedicated GRB mission, Swift. Swift is currently scheduled for launch in September 2004, providing a unique window of opportunity in AO-6 to initiate a Chandra follow-up observation of an exceptionally bright burst. This will allow us to obtain a high quality, high resolution grating spectrum of the X-ray afterglow, enabling us to detect X-ray emission lines, from elements such as Mg, Si, S, Ar, Ca and Fe in the afterglow spectrum. We will also determine the velocities of the emission lines and measure how they evolve with time, which is key for determining the physical origins of the hot, dense matter that surrounds GRBs. Grat- Exp. R.A. Dec. (J2000) Target Name Det. ing Time ----------------------------------------------------------------------------------- Swift GRB TOO1 ACIS-S LETG 100.00 =================================================================================== Proposal Number: 06500904 Proposal Title: The Energetics and Host Galaxies of X-ray Flashes PI: Derek Fox Subject Category: SN, SNR AND ISOLATED NS Abstract: The X-ray flashes (XRFs) occur at the cosmological distances of gamma-ray bursts (GRBs), but possess a non-thermal spectrum that peaks in the X-ray rather than the gamma-ray band. With an explosive energy similar to that of GRBs and supernovae (SNe), XRFs appear to couple an intermediate fraction of their energy to highly-relativistic ejecta. We have discovered the first four XRF afterglows and three of their likely host galaxies, and we propose a Chandra-HST program to substantially increase this sample. Chandra observations of the XRF afterglow will provide sub-arcsec astrometry and an estimate of its explosive energy; subsequent HST observations will characterize its host galaxy. These observations will help clarify the nature of the XRFs, the most likely link between GRBs and SNe. Grat- Exp. R.A. Dec. (J2000) Target Name Det. ing Time ----------------------------------------------------------------------------------- XRF Flux/Astrometry ACIS-S NONE 20.00 XRF Flux/Astrometry ACIS-S NONE 20.00 =================================================================================== Proposal Number: 06500918 Proposal Title: Chandra AO6 Monitoring Images of SNR1987A PI: David Burrows Subject Category: SN, SNR AND ISOLATED NS Abstract: SNR1987A provides a unique opportunity to study the development of a young supernova remnant at high resolution. We have monitored SN/SNR1987A at roughly six month intervals since October 1999. The remnant is expanding and is increasing rapidly in brightness. We propose to continue this monitoring program with two 50 ks observations in AO5, spaced six months apart. The remnant is now bright enough that these observations will permit spatially-resolved spectra in addition to monitoring the expansion (expected to begin slowing in the next year or two) and the development of new X-ray hot spots. They will also allow us to continue our search for a compact central object, which may become visible in the next year or two as the ejecta become optically thin. Grat- Exp. R.A. Dec. (J2000) Target Name Det. ing Time ----------------------------------------------------------------------------------- 05:35:28.00 -69:16:11.10 SNR1987A ACIS-S NONE 50.00 05:35:28.00 -69:16:11.10 SNR1987A ACIS-S NONE 50.00 =================================================================================== Proposal Number: 06500950 Proposal Title: Spectra of Neutron Stars with Strongly Magnetized Hydrogen Atmospheres PI: Marten van Kerkwijk Subject Category: SN, SNR AND ISOLATED NS Abstract: Neutron stars are unique laboratories for matter at extreme densities and magnetic field strengths. Much of the physics is encapsulated in neutron star spectra, but until recently no suitable sources were known. However, over the last year photospheric absorption features - likely due to hydrogen in strongly magnetized atmospheres - have been found for three nearby neutron stars. We propose to obtain high-quality, 300 ks LETG spectra of the two brightest sources. These data will allow examination of the absorption features and permit searches for other associated features. With detailed understandings of these lines one could measure the surface magnetic fields, compositions and temperatures, eventually leading to direct constraints on the equation of state at supra-nuclear densities. Grat- Exp. R.A. Dec. (J2000) Target Name Det. ing Time ----------------------------------------------------------------------------------- 07:20:25.00 -31:25:50.20 RX J0720.4-3125 HRC-S LETG 75.00 07:20:25.00 -31:25:50.20 RX J0720.4-3125 HRC-S LETG 75.00 07:20:25.00 -31:25:50.20 RX J0720.4-3125 HRC-S LETG 75.00 07:20:25.00 -31:25:50.20 RX J0720.4-3125 HRC-S LETG 75.00 =================================================================================== Proposal Number: 06500974 Proposal Title: X-Ray Counterparts to Neutron Star Bow Shocks PI: Shamibrata Chatterjee Subject Category: SN, SNR AND ISOLATED NS Abstract: Bow shock nebulae detected in H-alpha represent uniquely well constrained systems where the neutron star relativistic wind can be studied. We propose observations of two optical neutron star bow shocks, in order to detect X-ray tails and quantify their orientation, extent and possibly their spectral properties. Additionally, we propose a deeper observation of PSR B1957+20, which has known X-ray emission confined by an outer bow shock, in order to determine spectral evolution along the tail and to model the system. These observations will constrain the energetics of the relativistic wind in a complete set of H-alpha neutron star bow shocks, and distinguish between models for their formation and evolution. Grat- Exp. R.A. Dec. (J2000) Target Name Det. ing Time ----------------------------------------------------------------------------------- 21:24:43.80 -33:58:44.20 PSR J2124-3358 ACIS-S NONE 30.00 =================================================================================== Proposal Number: 06500992 Proposal Title: A Day in the Life of a Short Gamma-Ray Burst Afterglow PI: David Burrows Subject Category: SN, SNR AND ISOLATED NS Abstract: Gamma-ray burst models favor massive stellar collapse as the mechanism for long bursts and compact binary mergers for short bursts. While much observational progress has been made in recent years for afterglows of long bursts, nothing is known about afterglows of short bursts. The imminent launch of the Swift observatory will allow us to study short burst afterglows, and Chandra observations will be critical in determining their proximity to host galaxies and in studying progenitor envoronments through measurements of spectral lines. We propose two targets of opportunity to study a short burst afterglow: a 100 ks ACIS observation of a bright afterglow one day after the burst, and a 50 ks followup observation of the same afterglow 2 weeks after the burst. Grat- Exp. R.A. Dec. (J2000) Target Name Det. ing Time ----------------------------------------------------------------------------------- Swift Short GRB1 ACIS-S NONE 100.00 Swift Short GRB3 ACIS-S NONE 50.00 =================================================================================== Proposal Number: 06501001 Proposal Title: In Search of Vela-like Pulsars and their Wind Nebulae PI: Zaven Arzoumanian Subject Category: SN, SNR AND ISOLATED NS Abstract: We request 140 ks of Chandra time, distributed among three targets, to resolve the uncertain identifications of two candidate middle-aged pulsars associated with supernova remnants, and to search for a third. Middle-aged (~10 kyr) neutron stars are valuable because they are transition objects: their cooling behavior constrains the equation of state of super-dense matter in neutron star cores, and their steadily dwindling excitation of surrounding nebulae, unlike younger pulsars such as the Crab, is a theoretically well-studied but observationally unconstrained regime in supernova remnant studies. Grat- Exp. R.A. Dec. (J2000) Target Name Det. ing Time ----------------------------------------------------------------------------------- 20:22:20.20 +38:42:24.90 G76.9+1.0 ACIS-S NONE 60.00 =================================================================================== Proposal Number: 06501007 Proposal Title: Short-Hard Gamma-Ray Burst Afterglows with Chandra PI: Dale Frail Subject Category: SN, SNR AND ISOLATED NS Abstract: Seven years after the afterglow detections that revolutionized studies of the long-soft gamma-ray bursts, not even one afterglow of a short-hard GRB has been seen. Theoretical calculations suggest that short-hard afterglows will be much fainter than their long-soft counterparts, faint enough that ground-based detections will be challenging under the best of circumstances. Deep Chandra observations, on the other hand, should be able to detect the X-ray afterglow and localize it to sub-arcsecond precision. Such a localization will be critical to identifying the GRB host galaxy and and will also address burst progenitor models: high-mass stars will be found in the midst of their host galaxy's rest-frame optical light, while neutron star mergers may occur in the host galaxy halos. Grat- Exp. R.A. Dec. (J2000) Target Name Det. ing Time ----------------------------------------------------------------------------------- Short-Hard GRB (1) ACIS-S NONE 30.00 =================================================================================== Proposal Number: 06501055 Proposal Title: Vela-like PSR B1800-21 and its environment PI: Gordon Garmire Subject Category: SN, SNR AND ISOLATED NS Abstract: The young, Vela-like pulsar B1800-21 has the highest spin-down flux among the radio pulsars undetected in X-rays. Although the pulsar was claimed to be seen in a ROSAT observation, it was a misdetection due to an error in the pulsar radio position. It is possible, however, that the source detected by ROSAT is a pulsar-wind nebula powered by B1800-21 and strongly absorbed by the ISM. The pulsar is also not seen in the low-resolution ASCA images of the filed, possibly because of the contamination from the SNR G8.7-0.1 and confusion with the PWN. We propose a short exploratory observation with the Chandra ACIS to resolve this discrepancy and obtain high-resolution images and spectra of the intriguing but elusive pulsar/PWN couple and the SNR G8.7-0.1, possibly associated with the pulsar. Grat- Exp. R.A. Dec. (J2000) Target Name Det. ing Time ----------------------------------------------------------------------------------- 18:03:51.30 -21:36:29.00 PSR B1800-21 ACIS-S NONE 30.00 =================================================================================== Proposal Number: 06501075 Proposal Title: Monitoring of the Central Object in RCW103 PI: Gordon Garmire Subject Category: SN, SNR AND ISOLATED NS Abstract: The Central Compact Object in RCW103 has been varying in brightness over the past five years of Chandra monitoring observations. It had an outburst in early 2000 or late 1999 and has been decaying ever since. Historical data indicate that it might be due for another outburst in 2005, so we would like to continue the monitoring program. Grat- Exp. R.A. Dec. (J2000) Target Name Det. ing Time ----------------------------------------------------------------------------------- 16:17:36.30 -51:02:25.00 RCW103 ACIS-I NONE 5.00 16:17:36.30 -51:02:25.00 RCW103 ACIS-I NONE 5.00 16:17:36.30 -51:02:25.00 RCW103 ACIS-I NONE 5.00 16:17:36.30 -51:02:25.00 RCW103 ACIS-I NONE 5.00

*********************************************************************************** NORMAL GALAXIES: DIFFUSE EMISSION -------------------------------------------------- =================================================================================== Proposal Number: 06610019 Proposal Title: Testing Formation Models and Heating and Feedback Mechanisms In Galaxy Groups PI: Stephen Murray Subject Category: NORMAL GALAXIES: DIFFUSE EMISSION Abstract: We propose X-ray observations of NGC6269 the central galaxy in a poor group. We will determine baryon fractions, mass-to-light ratios, and gas mass and abundance distributions. The\is system is particularly appropriate for testing models of thermal conduction which may explain the absence of cool gas in "cooling flows". We will analyze ``edges'' to investigate mergers or gas motions. Finally, since this galaxy hosts a lobed radio source, we will study the effects of the radio plasma on the hot gas and test feedback models for AGN energy input into cooling flows. Also, we will study the ram pressure stripped galaxy NGC6265, a group member. Grat- Exp. R.A. Dec. (J2000) Target Name Det. ing Time ----------------------------------------------------------------------------------- 12:53:07.20 -10:29:39.00 NGC4760 ACIS-I NONE 3.00 21:19:00.20 -48:33:43.00 NGC7049 ACIS-I NONE 2.00 =================================================================================== Proposal Number: 06610028 Proposal Title: Snapshot Observations of X-ray Bright Early-Type Galaxies PI: Stephen Murray Subject Category: NORMAL GALAXIES: DIFFUSE EMISSION Abstract: We propose short snapshot observations of X-ray bright early-type galaxies selected from a large ROSAT survey. We will measure the nuclear and diffuse (hot thermal gas) emission and compare the core structure to radio maps, with particular emphasis on studying radio or X-ray jets. We will compare the nuclear emission to the central black hole mass derived from the galaxy velocity dispersion. Grat- Exp. R.A. Dec. (J2000) Target Name Det. ing Time ----------------------------------------------------------------------------------- 01:10:59.00 +33:08:42.00 NGC410 ACIS-S NONE 2.50 07:09:08.00 +48:36:56.00 NGC2329 ACIS-I NONE 3.00 07:11:10.80 +50:10:29.00 NGC2340 ACIS-S NONE 2.00 09:19:46.80 +33:44:59.00 NGC2832 ACIS-I NONE 3.00 09:44:16.00 -21:16:41.00 NGC2986 ACIS-S NONE 2.50 09:58:24.60 -26:55:36.00 NGC3078 ACIS-I NONE 8.00 13:52:53.30 -28:29:22.00 NGC5328 ACIS-S NONE 2.50 13:53:26.70 +40:16:59.00 NGC5353 ACIS-I NONE 5.00 17:44:57.70 -60:44:23.00 NGC6407 ACIS-S NONE 2.00 =================================================================================== Proposal Number: 06610143 Proposal Title: X-raying the Massive Sb Galaxy NGC 2841: a Test of Disk Galaxy formation Theories PI: Q. Daniel Wang Subject Category: NORMAL GALAXIES: DIFFUSE EMISSION Abstract: The nearby spiral galaxy NGC 2841 is located in a direction of minimal Galactic foreground absorption and is exceptionally massive. A Chandra snapshot observation has already shown evidence for a large-scale diffuse X-ray-emitting halo around the galaxy. We propose a 30 ksec Chandra ACIS-S observation to determine the contribution from discrete X-ray sources and to resolve the X-ray structure in the galactic disk and bulge. This observation, complemented by our approved 40 ksec XMM-Newton exposure, will enable us to measure the content, morphology, thermal status, metallicity, and cooling rate of the diffuse hot gas. We will then quantitatively test galaxy formation theories, which predict substantial amounts of hot gas cooling around massive disk galaxies. Grat- Exp. R.A. Dec. (J2000) Target Name Det. ing Time ----------------------------------------------------------------------------------- 09:22:02.60 +50:58:35.50 NGC 2841 ACIS-S NONE 30.00 =================================================================================== Proposal Number: 06610154 Proposal Title: Observation of the Hot Gas in the Nearby Dwarf Galaxy IC 1613 PI: ERIC SCHLEGEL Subject Category: NORMAL GALAXIES: DIFFUSE EMISSION Abstract: We propose to observe the hot gas in the nearby dwarf galaxy IC 1613. The prime target is the intricate complex of bubbles and supernova remants, one of the most tangled complex such regions in existence. Chandra observations will resolve the known supernova remnant present in this region. We will search for diffuse emission from the multiple bubbles present and correlate that emission with images obtained at other wavelengths, particularly H-alpha and radio. Grat- Exp. R.A. Dec. (J2000) Target Name Det. ing Time ----------------------------------------------------------------------------------- 01:04:54.20 +02:07:60.00 IC 1613 ACIS-S NONE 50.00 =================================================================================== Proposal Number: 06610162 Proposal Title: 30 Doradus: Our Starburst Microscope PI: Leisa Townsley Subject Category: NORMAL GALAXIES: DIFFUSE EMISSION Abstract: The Giant Extragalactic HII Region 30 Doradus in the LMC provides us with a unique view of the fundamental building block of starburst galaxies. It contains several extremely rich stellar clusters 1--10 million years old and a new generation of deeply embedded high-mass stars just now forming. HST and Spitzer data show that the combined actions of stellar winds and supernovae have carved the ISM into an amazing display of arcs, shells, pillars, voids, and bubbles, ranging over spatial scales of 1--100 pc. This is the GO contribution to a joint GTO+GO, 100-ksec observation of 30 Doradus. We will exploit Chandra's fine spatial resolution to study the diffuse X-ray morphology on 1--10 pc scales and to study the highest-mass O and Wolf-Rayet stars that shape it. Grat- Exp. R.A. Dec. (J2000) Target Name Det. ing Time ----------------------------------------------------------------------------------- 05:38:42.40 -69:06:02.00 30 Doradus ACIS-I NONE 100.00 =================================================================================== Proposal Number: 06610190 Proposal Title: Stellar Mass Loss Versus External Accretion in the X-ray Bright Elliptical NGC 5813 PI: Craig Sarazin Subject Category: NORMAL GALAXIES: DIFFUSE EMISSION Abstract: A Chandra image of NGC5813, an X-ray-bright elliptical with extended emission line filaments and dust, will be used to study the interaction between the hot, X-ray gas and cooler (merger related?) interstellar material. A previous ROSAT HRI image suggests a correlation with cooler material. We will determine whether heat conduction into the cooler gas or energy losses to grains affect the thermal state of the gas. The elemental abundances and gradients in the hot gas will be derived and compared to the stellar values. If the gas results from local stellar mass loss, the abundances should be similar. If there is a cooling flow, the abundances at each radius should reflect those of stars at larger radii. Inflow of intergalactic gas would produce low abundances with only weak gradients. Grat- Exp. R.A. Dec. (J2000) Target Name Det. ing Time ----------------------------------------------------------------------------------- 15:01:11.30 +01:42:07.10 NGC5813 ACIS-S NONE 49.00 =================================================================================== Proposal Number: 06610382 Proposal Title: The Exploding Galaxies M84 and M89 PI: Christine Jones Subject Category: NORMAL GALAXIES: DIFFUSE EMISSION Abstract: The early-type Virgo galaxies M84 and M89 exhibit prime examples of interactions between radio outbursts from a SMBH and the X-ray ISM. The Chandra image of M84 revealed X-ray cavities that coincide with radio lobes, as well as a jet, a hard diffuse component and a population of point sources. We propose deep ACIS-S observations to 1) investigate the interaction of the radio plasma with the X-ray emitting gas, 2) determine the origin of the extended hard emission and 3) extend the luminosity function for galactic sources. The small X-ray filled lobes and strong core radio source in M89 suggest a more recent outburst than in M84. Deep ACIS-S images of M84 and M89 will allow a detailed comparison of how the impact of a nuclear outburst on the ISM evolves over time. Grat- Exp. R.A. Dec. (J2000) Target Name Det. ing Time ----------------------------------------------------------------------------------- 12:25:03.80 +12:53:13.00 M84 ACIS-S NONE 90.00 =================================================================================== Proposal Number: 06610871 Proposal Title: Dust-to-gas ratio in the z=0.44 lens galaxy B1152+199 PI: Kristian Pedersen Subject Category: NORMAL GALAXIES: DIFFUSE EMISSION Abstract: B1152+199 is a unique, X-ray bright gravitational lens system, showing strong optical extinction in one of its images passing through a massive z=0.44 lens galaxy. The system is ideal for obtaining the first accurate measurement of differential X-ray absorption between QSO images, providing a measure of the gas content of the lens galaxy. Using this new method and our extensive VLT mapping of the extinction curve for the lens galaxy, we will obtain a key measurement of the dust-to-gas ratio in a Milky Way like galaxy at z=0.44. This will provide a crucial reference point for studying the properties of the gas supply for star formation in the 0

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NORMAL GALAXIES: X-RAY POPULATIONS                
--------------------------------------------------

===================================================================================

Proposal Number: 06620006            
Proposal Title: Black Hole X-ray Nova in M31

PI: Stephen Murray                 
Subject Category: NORMAL GALAXIES: X-RAY POPULATIONS                

Abstract: During A02,3, and 5 we found more than a dozen Black Hole X-ray Novae
(BHXN) in M31 using Chandra, and with HST (WF/PC2 and ACS) found five potential
optical counterparts. We propose to continue this program, with the goals of
understanding the behavior of BH and neutron star (NS) X-ray nova in our nearest
neighbor galaxy. With sufficient numbers of optical counterparts we will be able
to determine the orbital period distribution of BHXN in M31. Uninterrupted
monitoring of M31 is necessary to investigate the duty cycles and long-term
lightcurves of BHXN (and other variables) in M31, and only Chandra can provide
this. By continuing the program though AO10 we will amass nearly 500ks on the
bulge of M31, giving the most detailed view of a nearby galaxy possible until
Gen-X.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 00:42:44.40  +41:16:08.30  M31-Center            ACIS-I NONE   5.00
 00:42:44.40  +41:16:08.30  M31-Center            ACIS-I NONE   5.00
 00:42:44.40  +41:16:08.30  M31-Center            ACIS-I NONE   5.00
 00:42:44.40  +41:16:08.30  M31-Center            ACIS-I NONE   5.00
 00:42:44.40  +41:16:08.30  M31-Center            ACIS-I NONE   5.00

===================================================================================

Proposal Number: 06620137            
Proposal Title: Low Mass X-ray Binaries and Globular Clusters in the Early-Type
Galaxy NGC 4365

PI: Gregory Sivakoff               
Subject Category: NORMAL GALAXIES: X-RAY POPULATIONS                

Abstract: A previous Chandra image of the X-ray faint E3 elliptical, NGC 4365,
mainly resolved it into low mass X-ray binaries (LMXBs). Most of the LMXBs are
located in globular clusters (GCs), but previous samples were limited by the
number of LMXBs and HST coverage of only the NW quarter. New Chandra observations
will detect ~240 LMXBs down to 3.5E37 ergs/s and nearly triple the number of
GC-LMXBs. NGC 4365 is one of the brightest galaxies observed in the Hubble ACS
Virgo Cluster Survey, which has yielded GC information for the entire galaxy. We
will compare the properties of GCs, LMXBs, and their union with the aim of
understanding the origin of LMXBs and constraining the evolution of GCs. Multiple
observations will allow the variability of sources to be assessed on minute to 4
year timescales.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 12:24:28.30  +07:19:03.80  NGC4365               ACIS-S NONE  40.00
 12:24:28.30  +07:19:03.80  NGC4365               ACIS-S NONE  40.00
 12:24:28.30  +07:19:03.80  NGC4365               ACIS-S NONE  40.00
 12:24:28.30  +07:19:03.80  NGC4365               ACIS-S NONE  40.00

===================================================================================

Proposal Number: 06620189            
Proposal Title: A State Transition of the Ultraluminous X-Ray Source in M82

PI: Philip Kaaret                  
Subject Category: NORMAL GALAXIES: X-RAY POPULATIONS                

Abstract: Ultraluminous X-ray sources (ULXs) are bright, non-nuclear X-ray
sources in external galaxies. They have been interpreted as microquasars with jet
beamed towards us (microblazars), mechanically beamed stellar-mass accreting
black holes, and intermediate-mass black holes. We have an approved program to
monitor the ULX in M82 with the Rossi X-Ray Timing Explorer. Here, we propose
Chandra observations to be triggered after a state transition by the source to a
high flux state. This will permit us to accurately measure the spectrum of the
source in a high flux state to accurately measure the X-ray and multiwavelength
spectrum of the source and search for reported Fe line emission and quasiperiodic
oscillations.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 09:55:50.20  +69:40:47.00  M82 ULX               ACIS-S NONE  60.00

===================================================================================

Proposal Number: 06620314            
Proposal Title: M31* - The Nearest Extra-galactic SuperMassive Black Hole

PI: Michael Garcia                 
Subject Category: NORMAL GALAXIES: X-RAY POPULATIONS                

Abstract: We propose a long look at the nearest extra-galactic SMBH in order to
determine it's X-ray luminosity and variability characteristics. A previous 50ks
image with the HRC provides evidence that M31* is detected, and this longer look
can confirm this detection. While M31* is 100x further away than Sgr~A*, the fact
that it is 10x more massive and imbedded in diffuse gas somewhat cooler renders
it's (angular) Bondi radius only slightly smaller than that of Sgr~A*. Because
Chandra can resolve this Bondi radius and because it is the closest
extra-galactic SMBH, M31* is one of the best sources to place constraints on
radially inefficient accretion flows. Until Gen-X in the 2020+ timeframe, HRC
observations of M31* will provide the most detailed images of a quiescent
extra-galactic SMBH.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 00:42:44.40  +41:16:08.30  M31*                  HRC-I  NONE  50.00
 00:42:44.40  +41:16:08.30  M31*                  HRC-I  NONE  50.00
 00:42:44.40  +41:16:08.30  M31*                  HRC-I  NONE  50.00
 00:42:44.40  +41:16:08.30  M31*                  HRC-I  NONE  50.00

===================================================================================

Proposal Number: 06620375            
Proposal Title: X-rays and Galactic Structure

PI: Douglas Swartz                 
Subject Category: NORMAL GALAXIES: X-RAY POPULATIONS                

Abstract: The very different dynamical natures of ring, bar and spiral structures
in intermediate-type spiral galaxies should display distinct X-ray emission
signatures. In particular, the spectral, spatial, and brightness distributions of
discrete X-ray sources and of unresolved emission associated with these features
can be used to probe their evolutionary history, to obtain a more complete
picture of star-formation processes, and to test against theories such as models
for the evolution of the X-ray source populations. We will compare the luminosity
and color-color distributions of discrete sources in these substructures,
determine the spatial dependence of the spectral properties of the unresolved
emission, and perform timing and spectral analysis of the brightest individual
sources.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 10:43:58.00  +11:42:15.00  NGC 3351              ACIS-S NONE  40.00
 10:43:58.00  +11:42:15.00  NGC 3351              ACIS-S NONE  40.00
 10:43:58.00  +11:42:15.00  NGC 3351              ACIS-S NONE  40.00

===================================================================================

Proposal Number: 06620434            
Proposal Title: PROBING THE LINK BETWEEN GALACTIC BARS & STARBURST/AGN ACTIVITY
IN NGC1672/NGC7771

PI: Leigh Jenkins                  
Subject Category: NORMAL GALAXIES: X-RAY POPULATIONS                

Abstract: Multi-wavelength data have shown that a substantial fraction of barred
spiral galaxies exhibit enhanced star formation activity in their central
regions. This phenomena is however poorly studied at X-ray energies. We propose
joint Chandra/HST observations of two barred starburst galaxies NGC1672 and
NGC7771. We request Chandra observations to spatially resolve the X-ray emission
into point sources and diffuse emission, enabling us to trace the star formation
on small spatial scales and search for obscured starburst/AGN activity. We also
request a complimentary optical imaging program with HST/ACS, permitting us to
identify the optical counterparts to X-ray point sources and map the optical
emission from star formation in their local environments on similar scales to
Chandra.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 04:45:42.10  -59:14:56.00  ngc 1672              ACIS-S NONE  40.00

===================================================================================

Proposal Number: 06620848            
Proposal Title: Chandra HETG View of an ULX Associated with an SNR in Holmberg
II

PI: Gulab Dewangan                 
Subject Category: NORMAL GALAXIES: X-RAY POPULATIONS                

Abstract: We propose to obtain a 100ks Chandra HETG spectrum of a bright and
unique ultra-luminous X-ray source Holmberg II X-1, which has shown evidences for
X-ray emission lines in the ASCA, Chandra, and XMM-Newton CCD data, suggestive of
its association with a supernova remnant. Holmberg II X-1 is well known for its
long term X-ray variability, unusual high/hard - low/soft X-ray spectral
variations, and optical emission line nabulae. The main objective is to confirm
the presence of X-ray emission lines with the HETG, and investigate its
association with a supernova/hypernova remnant decisively. The 100ks long
observation will also enable us to search for spectral variations, QPOs and break
in the power density spectrum, which will help determining the mass of the black
hole.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 08:19:29.00  +70:42:19.60  Holmberg II X-1       ACIS-S HETG 100.00

===================================================================================

Proposal Number: 06620985            
Proposal Title: Galactic Bulge Chandra-HST Survey

PI: Jonathan Grindlay              
Subject Category: NORMAL GALAXIES: X-RAY POPULATIONS                

Abstract: We propose a deep survey for low luminosity accretion powered sources
(CVs, qLMXBs and wind-fed pulsars) that likely constitute the underlying
populations in the cusp of sources around SgrA*. A 100ksec pointing at l,b =
0.10, -1.43 allows the survey closest to the galactic center that can still be
reached in optical. With 12 orbits of HST, we can complement the two outer fields
(Baade's Window and Stanek Window) obtained with Chandra-HST to complete the most
sensitive X-ray/optical survey of the Galactic Bulge.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 17:51:28.50  -29:35:16.80  Limiting Window       ACIS-I NONE 100.00

===================================================================================

Proposal Number: 06620999            
Proposal Title: An Unprecedented View of a Galaxy's Dynamic X-ray Source
Population

PI: David Pooley                   
Subject Category: NORMAL GALAXIES: X-RAY POPULATIONS                

Abstract: We propose an innovative and unique observing program for M81 to unlock
an area that is completely unexplored for any galaxy but our own. We will observe
the galaxy every 3 days for a total of 6 weeks, each time reaching a luminosity
limit of 5e36 erg/s. Our observations will probe an new regime of variability for
extragalactic sources, providing us with information from which we can make
secure classifications. When combined together, these data will be the deepest
yet Chandra exposure of a complete galaxy. Our data will provide a critical test
and calibration of the use of X-ray luminosity functions as a characterization of
a galaxy's X-ray sources. Given their ubiquity in the literature, this has far
reaching ramifications.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 09:55:33.20  +69:03:55.10  M81                   ACIS-S NONE  12.00
 09:55:33.20  +69:03:55.10  M81                   ACIS-S NONE  12.00
 09:55:33.20  +69:03:55.10  M81                   ACIS-S NONE  12.00
 09:55:33.20  +69:03:55.10  M81                   ACIS-S NONE  12.00
 09:55:33.20  +69:03:55.10  M81                   ACIS-S NONE  12.00
 09:55:33.20  +69:03:55.10  M81                   ACIS-S NONE  12.00
 09:55:33.20  +69:03:55.10  M81                   ACIS-S NONE  12.00
 09:55:33.20  +69:03:55.10  M81                   ACIS-S NONE  12.00
 09:55:33.20  +69:03:55.10  M81                   ACIS-S NONE  12.00
 09:55:33.20  +69:03:55.10  M81                   ACIS-S NONE  12.00
 09:55:33.20  +69:03:55.10  M81                   ACIS-S NONE  12.00
 09:55:33.20  +69:03:55.10  M81                   ACIS-S NONE  12.00
 09:55:33.20  +69:03:55.10  M81                   ACIS-S NONE  12.00
 09:55:33.20  +69:03:55.10  M81                   ACIS-S NONE  12.00
 09:55:33.20  +69:03:55.10  M81                   ACIS-S NONE  12.00

===================================================================================

Proposal Number: 06621003            
Proposal Title: Simultaneous Gamma-Ray to Sub-Millimeter Monitoring of
Sagittarius A*

PI: Frederick Baganoff             
Subject Category: NORMAL GALAXIES: X-RAY POPULATIONS                

Abstract: We propose five 50-ks ACIS-I observations of SgrA*. Chandra detects 1.3
+/- 0.4 X-ray flares per day from SgrA*. VLT and Keck detect 2-6 IR flares per
day. Chandra and VLT have detected one correlated X-ray/IR flare; more flares are
needed to constrain the broad-band spectrum. Simultaneous monitoring with
Chandra, HESS, VLT, Keck, and SMA are proposed to search for correlated
variations between X-ray, gamma-ray, IR, and sub-mm to characterize the emission
process. Simultaneous multiwavelength monitoring provides the only means to
discriminate between synchrotron and SSC origins for the Sgr A* flares. HESS has
discovered a TeV point source within 30" of Sgr A* (confidential). All known TeV
point sources are variable, so simultaneous Chandra and HESS monitoring will
identify the TeV source.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 17:45:40.00  -29:00:28.00  Sgr A*                ACIS-I NONE  49.00
 17:45:40.00  -29:00:28.00  Sgr A*                ACIS-I NONE  49.00
 17:45:40.00  -29:00:28.00  Sgr A*                ACIS-I NONE  49.00
 17:45:40.00  -29:00:28.00  Sgr A*                ACIS-I NONE  49.00
 17:45:40.00  -29:00:28.00  Sgr A*                ACIS-I NONE  49.00

===================================================================================

Proposal Number: 06621003            
Proposal Title: Monitoring a New X-ray Transient 2.5 Arcseconds South of Sgr A*

PI: Frederick Baganoff             
Subject Category: NORMAL GALAXIES: X-RAY POPULATIONS                

Abstract: Chandra observations on 5-6 July reveal a transient 2.5" south (0.1 pc
at 8 kpc) of Sgr A*, in an extreme habitat already known to contain two dense
star clusters and a 3e6 solar-mass black hole. Its 2-8 keV spectrum (gamma <
0.25) is harder than most INTEGRAL sources. Its luminosity is >2e34 erg/s, with a
possible 4 h period, so it is an accreting BH or NS, and may emit much of its
flux above 10 keV. Thus, this source may be responsible for much of the emission
detected by INTEGRAL and HESS (TeV) during recent observations of Sgr A*. Also,
diffuse X-rays only 4 light-months from the source have brightened, suggesting
the presence of a jet. We propose to observe the progression of this outburst:
(1) to tell us whether it is active during upcoming gamma-ray observations, (2)
to determine the mechanism that feeds the source (disk or wind), and (3) to
observe the evolution of the jet. This is a singular opportunity to study the
interplay between accretion, jets, and gamma-ray emission.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 17:45:40.00  -29:00:28.00  CXOGC J174540.0-2900  ACIS-I NONE   5.00


***********************************************************************************
ACTIVE GALAXIES AND QUASARS                       
--------------------------------------------------

===================================================================================

Proposal Number: 06700009            
Proposal Title: An X-ray study of the hot gas environment around the nearby
radio galaxy IC 310

PI: Stephen Murray                 
Subject Category: ACTIVE GALAXIES AND QUASARS                       

Abstract: We propose to investigate the X-ray environment of the radio galaxy IC
310. This galaxy is the dominant member of a group that is falling into the
Perseus cluster, and is also a prototypical head-tail radio galaxy. This target
offers us the opportunity to study both the dynamics of group/cluster mergers and
the interaction between radio jets and the ambient ISM. We will study the merger
by mapping the thermodynamic parameters of the group and cluster gas, and search
for shocks or other surface brightness discontinuities. A study of the
interaction of the jet, particularly the stalled forward jet, and the ambient
environment will allow us to better understand the internal dynamics of jets.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 03:16:43.00  +41:19:29.40  IC 310                ACIS-I NONE   5.00
 03:16:43.00  +41:19:29.40  IC 310                ACIS-I NONE  25.00

===================================================================================

Proposal Number: 06700021            
Proposal Title: Time variability of the warm outflow in NGC 5548

PI: Mariano Mendez                 
Subject Category: ACTIVE GALAXIES AND QUASARS                       

Abstract: We propose to observe the Seyfert 1 galaxy NGC 5548 for 147 ks with the
LETGS in order to obtain a high-resolution X-ray spectrum. NGC 5548 has been
observed earlier with the LETGS on two different occasions. A comparison of both
spectra shows that a significant change in the warm absorber occurred in the
K-shell absorption line of O V, the most lowly ionized oxygen ion with a well
measured absorption line. A recent HST observation shows significant changes in
the column density of the different velocity components of C IV. With our new
observation we will study further the long term variability of the outflow, by
comparing the X-ray spectrum with the two earlier LETGS spectra as well as
archival HETGS and XMM-Newton RGS spectra.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 14:17:59.60  +25:08:13.40  NGC 5548              HRC-S  LETG 147.00

===================================================================================

Proposal Number: 06700023            
Proposal Title: The High Velocity Ionized Outflow of PG 0844+349

PI: Claude Canizares               
Subject Category: ACTIVE GALAXIES AND QUASARS                       

Abstract: We propose a 150 ksec HETGS observation of the nearby radio quiet
quasar PG 0844+349 to study the nucleus and its high velocity ionized outflow.
The high column density of outflowing, highly ionized gas imprints broad
absorption features on the quasar spectrum that are blue-shifted (with respect to
the systemic velocity) by approximately 15 to 30 per cent. We will use these
spectral features to constrain the ionization state and kinematics of the
relativistic outflow. We will also search for narrow emission and absorption
features at the systemic velocity that provide information about the
circumnuclear environment. Finally, we will monitor the continuum flux for
variability and study the iron fluorescence line from the nucleus.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 08:47:42.40  +34:45:04.00  PG 0844+349           ACIS-S HETG 150.00

===================================================================================

Proposal Number: 06700026            
Proposal Title: Understanding the accretion process in a Low-Luminosity AGN: is
M81* a starved black hole?

PI: Claude Canizares               
Subject Category: ACTIVE GALAXIES AND QUASARS                       

Abstract: We propose to use HETGS observations to investigate the accretion and
outflow mechanisms in the underluminous supermassive black hole in M81*. We
expect to identify and measure the radial infall velocity of the H-like and
He-like iron emission originating from hot plasma closest to the black hole. We
will measure the radiative efficiency of accretion from radio polarimetry and
test if photoionization is heating the hot plasma. We wish to establish the
intraday variability in the source and search for X-ray flares, which will allow
us to constrain theoretical models of low-efficiency accretion or outflow.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 09:55:33.20  +69:03:55.10  M81*                  ACIS-S HETG 130.00
 09:55:33.20  +69:03:55.10  M81*                  ACIS-S HETG 170.00

===================================================================================

Proposal Number: 06700036            
Proposal Title: Alternate: Magnified Views of Quasar Outflows

PI: Gordon Garmire                 
Subject Category: ACTIVE GALAXIES AND QUASARS                       

Abstract: The confirmation of relativistic quasar outflows in most quasars would
imply higher mass flow rates than those based on outflow velocities derived from
UV BALs. These outflowing winds may thus provide a significant contribution to
the enrichment of the vicinity of the quasars and their host galaxies with
accretion disk material. To assess the commonality of relativistic outflows in
quasars we propose to observed the distant z = 3.6 lensed BALQSO SDSS0903+5028.
This is an intriguing object to observe with Chandra because of its relatively
high redshift, and cluster lens. We will include SDSS0903+5028 in our sample of
high-z lenses radio quiet quasars and verify whether it is consistent with our
recently discovered Gamma-LX correlation.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 09:03:34.90  +50:28:19.20  SDSS 0903+5028        ACIS-S NONE  20.00

===================================================================================

Proposal Number: 06700037            
Proposal Title: A Study of Quasar Evolution With The Aid Of Lensing

PI: Gordon Garmire                 
Subject Category: ACTIVE GALAXIES AND QUASARS                       

Abstract: The main scientific goals of this proposal are to: (a) study the
evolution of high redshift radio quiet quasars (RQQs) with the aid of
gravitational lensing. The proposed observations combined with the proposed
targets in the GO program for cycle 6 will double the size of our present sample
of RQQs and confirm unabiguously that the previously observed correlation between
X-ray luminosity and photon index of high redshift RQQs (1.5 5.8. We will study their
broad-band spectral energy distributions and perform joint spectral fitting to
derive average spectral constraints (photon index and absorption) in the 3-50 keV
rest-frame band. These observations will provide key flux information needed for
effective planning of future X-ray spectroscopy. We will also continue studying
the X-ray properties of a remarkable group of high-redshift quasars with very
weak emission lines.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 00:02:39.40  +25:50:34.80  SDSS J0002+2550       ACIS-S NONE   6.40
 00:05:52.30  -00:06:55.80  SDSS J0005-0006       ACIS-S NONE  19.10
 08:40:34.80  +56:24:25.20  SDSS J0840+5624       ACIS-S NONE  15.90
 10:48:45.00  +46:37:18.30  SDSS J1048+4637       ACIS-S NONE  15.20
 14:08:50.90  +02:05:22.60  SDSS J1408+0205       ACIS-S NONE   6.80
 14:11:11.30  +12:17:37.30  SDSS J1411+1217       ACIS-S NONE  14.50
 15:32:59.90  -00:39:44.10  SDSS J1532-0039       ACIS-S NONE   9.40
 15:36:50.30  +50:08:10.30  SDSS J1536+5008       ACIS-S NONE   4.50
 16:02:54.20  +42:28:22.90  SDSS J1602+4228       ACIS-S NONE  13.20
 16:23:31.80  +31:12:00.50  SDSS J1623+3112       ACIS-S NONE  17.40
 16:26:26.40  +27:51:32.40  SDSS J1626+2751       ACIS-S NONE   4.80
 16:30:33.90  +40:12:09.60  SDSS J1630+4012       ACIS-S NONE  27.60

===================================================================================

Proposal Number: 06700165            
Proposal Title: The quiescent nucleus and X-ray source population of the nearest
giant elliptical galaxy

PI: Christopher Reynolds           
Subject Category: ACTIVE GALAXIES AND QUASARS                       

Abstract: How inefficient can black hole accretion be? To answer this question,
we propose a 60ks observation of Maffei 1, the nearest major elliptical galaxy.
Our principal goal is to search for low-level nuclear activity - we will be
sensitive to nuclear activity with luminosities as low as 10^-7 of the naive
radiatively-efficient Bondi luminosity. Failing to detect nuclear activity will
strongly constrain theoretical models of black hole accretion, requiring models
that effectively starve the mass flow rate. We will also probe the discrete X-ray
source population down 2*10^36erg/s. In particular, we will determine the X-ray
properties of the recently studied globular cluster population of Mf1.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 02:36:35.40  +59:39:19.00  Maffei 1              ACIS-S NONE  60.00

===================================================================================

Proposal Number: 06700203            
Proposal Title: AN X-RAY MICROLENSING TEST OF THE AU-SCALE CENTRAL STRUCTURE OF
THE QUADRUPLE QUASAR 2237+0305

PI: Shin Mineshige                 
Subject Category: ACTIVE GALAXIES AND QUASARS                       

Abstract: We propose Chandra observation of the gravitationally lensed quasar
Q2237+0305 (Einstein Cross) during a microlensing event. We will monitor the four
images of the QSO from the ground regularly to ascertain the onset of a
microlensing event. As the microlensing event occurs, we will measure the
variations of X-ray intensity and spectra with Chandra and compare with those
taken after the event. Since only a small region of the QSO accretion disk is
strongly magnified during a microlensing event, we will be able to limit the size
of X-ray emitting regions of the QSO and thus the mass which is contained on
scales of several AUs. If observed simultaneously with ground-based telescopes
and with HST, furthermore, we will also be able to probe multi-wavelength
emission properties of QSOs.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 22:44:30.30  +03:21:31.00  Q2237+0305 (Einstein  ACIS-S NONE  20.00
 22:44:30.30  +03:21:31.00  Q2237+0305 (Einstein  ACIS-S NONE  20.00
 22:44:30.30  +03:21:31.00  Q2237+0305 (Einstein  ACIS-S NONE  20.00
 22:44:30.30  +03:21:31.00  Q2237+0305 (Einstein  ACIS-S NONE  20.00

===================================================================================

Proposal Number: 06700234            
Proposal Title: Extended inverse Compton emission from distant powerful radio
galaxies

PI: Andrew Fabian                  
Subject Category: ACTIVE GALAXIES AND QUASARS                       

Abstract: We and others have discovered extended X-ray emission around several
distant powerful radio galaxies. The emission is likely from inverse Compton
scattering of CMB photons, the energy density of which rises steeply with
redshift. The X-ray emission gives the best estimate of the total energy injected
as relativistic electrons into the surroundings since the X-ray emitting
electrons last longer. Considerable energy is injected which affects the gas
properties of the host galaxy, group or cluster. All massive galaxies may have
passed through such a phase. We propose to study a sample of similarly powerful
and distant radio galaxies to understand how common the phenomenon is and which
radio source parameters are the best indicators of extended X-ray emission.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 08:04:47.90  +10:15:23.00  3C 191                ACIS-S NONE  20.00
 09:08:16.90  +39:43:26.00  6C 0905+3955          ACIS-S NONE  20.00
 21:22:46.20  +17:04:38.00  3C 432                ACIS-S NONE  20.00

===================================================================================

Proposal Number: 06700300            
Proposal Title: The Jet-Like X-ray Structure at the High Redshift Quasar
J0841+1311

PI: Daniel Schwartz                
Subject Category: ACTIVE GALAXIES AND QUASARS                       

Abstract: We propose a high spatial resolution observation of the remarkable
object CXOMP J084128.3+131107, which shows a jet-like structure in X-rays with no
associated radio emission (Schwartz et al. 2004). This object (hereafter called
J0841) was discovered in the ChaMP survey, which by virtue of the wide angle
covered is ideal for finding rare and unusual objects, e.g. lensed QSO's and
X-ray jets. We propose a 30 ks observation to reveal the nature of this object,
and to obtain information on its X-ray structure. The object is identified with a
QSO at redshift 1.866, but is an unusual candidate for an X-ray jet, because we
do not detect any associated radio emission.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 08:41:28.00  +13:11:07.00  CXOMP J084128.3+1311  ACIS-S NONE  30.00

===================================================================================

Proposal Number: 06700323            
Proposal Title: THE X-RAY PROPERTIES OF HIGHER REDSHIFT RED AGN

PI: Belinda Wilkes                 
Subject Category: ACTIVE GALAXIES AND QUASARS                       

Abstract: The red optical colors, high polarisation and intermediate spectral
type of 2MASS AGN, and their absorbed Chandra spectra imply that the nucleus is
partially obscured by Unification's `putative' disk/torus. Given our
line-of-sight, their unusual multiwavelength properties uniquely probe this
obscuring material. Their X-ray properties and high space density ensure their
strong contribution to the Cosmic X-ray Background (CXRB). This, the largest,
uniform sample of X-ray absorbed AGN, provides a unique opportunity to
characterize a key population and probe AGN structure. X-ray observations are
available for 44 low-redshift (<0.4) 2MASS AGN. We propose Chandra observations
of 7 with 0.510,000 in radio
power, sampling both the radio-loud and -quiet OPXG populations. In combination
with complementary optical and radio observations, we hope to survey the OPXG
source population and begin to develop diagnostics which will distinguish between
the various OPXG flavors.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 00:13:31.10  +40:51:37.10  RGB0013+408           ACIS-S NONE   3.00
 00:40:50.50  +10:03:26.70  RGB0040+100           ACIS-S NONE   3.00
 02:23:34.30  +39:36:04.30  RGB0223+396           ACIS-S NONE   4.00
 02:38:32.70  +02:33:48.80  RGB0238+025A          ACIS-S NONE   3.00
 08:34:47.60  +39:28:17.70  RXJ0834.8+3928        ACIS-S NONE   6.00
 08:59:46.40  +27:45:34.80  RXJ0859.8+2745        ACIS-S NONE   7.00
 11:44:36.80  +67:24:21.30  RGB1144+674           ACIS-S NONE   3.00
 13:24:00.90  +57:39:16.40  RGB1324+576           ACIS-S NONE   3.00
 15:12:15.80  +02:03:17.00  RGB1512+020A          ACIS-S NONE   3.00
 16:42:38.60  +27:26:37.30  RXJ1642.6+2726        ACIS-S NONE   3.00
 23:07:26.40  +04:06:25.70  RGB2307+041           ACIS-S NONE   5.00

===================================================================================

Proposal Number: 06700612            
Proposal Title: Bringing in the Last SHEEP

PI: Kirpal Nandra                  
Subject Category: ACTIVE GALAXIES AND QUASARS                       

Abstract: The SHEEP 5-10 keV survey with ASCA tries to answer questions about the
nature of the objects making the X-ray background, by selecting hard sources that
are nonetheless bright enough for detailed followup. We have obtained Chandra
snapshot observations of 35/69 SHEEP in AO3 to give accurate positions, and
optical identifications at the NOAO 4m telescopes. The results are fascinating,
revealing e.g. a total lack of correspondence between optical and X-ray
obscuration measures, and interesting populations such as narrow line AGN in
massive E/S0 galaxies. There are 11 objects remaining, which despite ROSAT
positions, have ambiguous optical IDs. Chandra snapshots for these, and NOAO time
to classify them and the remaining objects in the sample without spectra, will
complete our survey.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 02:07:44.30  +35:11:14.00  AX J0207.7+3511       ACIS-S NONE   5.00
 04:01:25.60  +00:38:49.00  AX J0401.4+0038       ACIS-S NONE   5.00
 06:42:57.80  +67:51:45.00  AX J0642.9+6751       ACIS-S NONE   5.00
 08:43:04.50  +50:14:29.00  AX J0843.0+5014       ACIS-S NONE   5.00
 10:40:23.40  +20:45:47.00  AX J1040.3+2045       ACIS-S NONE   5.00
 12:28:26.20  +13:00:22.00  AX J1228.4+1300       ACIS-S NONE   5.00
 12:41:21.70  +35:01:01.00  AX J1241.3+3501       ACIS-S NONE   5.00
 12:57:40.10  +35:25:34.00  AX J1257.6+3525       ACIS-S NONE   5.00
 13:54:11.60  +33:41:03.00  AX J1354.1+3341       ACIS-S NONE   5.00
 14:26:52.10  +26:19:35.00  AX J1426.8+2619       ACIS-S NONE   5.00
 14:26:54.30  +23:34:58.00  AX J1426.9+2334       ACIS-S NONE   5.00

===================================================================================

Proposal Number: 06700636            
Proposal Title: The X-ray Jet of the X-ray faint supermassive nuclear black hole
in NGC 821

PI: Giuseppina Fabbiano            
Subject Category: ACTIVE GALAXIES AND QUASARS                       

Abstract: We propose a 200ks ACIS-S observation centered on the nucleus of
NGC821. This galaxy was observed in Cycle 4 by the PI for 40ksec, as part of a
sample of quiescent supermassive black holes. The data suggest a 8.5'' (~1 kpc)
possibly curved `jet' centered on the nucleus. This is the faintest reported
nuclear jet. The luminosity of this feature is 3.5E39 ergs/s (0.2-10~keV). The
proposed observations will provide the deeper data needed for a more definite
understanding of this fascinating object. We also propose a set of VLA
observations. While not essential to carry the science of this program, they will
enhance it. NOTE: the RPS form does not allow us to enter the full set of
proposed VLA observations.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 02:08:21.00  +10:59:41.10  NGC821                ACIS-S NONE  30.00
 02:08:21.00  +10:59:41.10  NGC821                ACIS-S NONE 170.00

===================================================================================

Proposal Number: 06700769            
Proposal Title: THE ENIGMATIC X-RAY JET OF 3C120

PI: DANIEL HARRIS                  
Subject Category: ACTIVE GALAXIES AND QUASARS                       

Abstract: We propose a 60ks ACIS-S observation of 3C120 to investigate the X-ray
emission process for a well resolved knot in the jet. Since we have strong
arguments against thermal and inverse Compton models, we believe that the jet
related X-ray emission in 3C120 arises from the synchrotron process. However, for
two components of this resolved knot, the data are consistent with a flat X-ray
spectrum which defies attempts to fit the radio and X-ray data with a canonical
(concave downwards) synchrotron model. Our goal is to obtain sufficient counts
for a spectral analysis for each of the components of this knot and demonstrate
the existence of non-standard synchrotron spectra. The evidence we obtain will
impact the interpretation of shock acceleration and reconnection scenarios.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 04:33:09.50  +05:21:39.00  3C120                 ACIS-S NONE  60.00

===================================================================================

Proposal Number: 06700774            
Proposal Title: Studying the X-ray properties of SDSS candidate Type II quasars
with exploratory Chandra observations

PI: Cristian Vignali               
Subject Category: ACTIVE GALAXIES AND QUASARS                       

Abstract: We propose to observe with Chandra a sample of six candidate Type II
(i.e., narrow-line) quasars selected from among the SDSS sample of Zakamska et
al. (2003) on the basis of their large [O III] luminosities. The study of their
X-ray emission through spectral fitting will allow us to verify whether the
population of optically selected Type II quasars have properties similar to those
of X-ray selected Type II quasars. The main goal of these exploratory
observations is to test whether optically selected Type II quasars are strongly
obscured sources as expected from Unification models. The proposed objects
constitute an ideal sample for studies of the Type II quasar population given the
well-defined selection criteria provided by the SDSS.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 00:50:09.80  -00:39:00.60  SDSS J005009.81-0039  ACIS-S NONE   8.00
 03:19:50.50  -00:58:50.60  SDSS J031950.54-0058  ACIS-S NONE  12.00
 08:15:07.40  +43:04:27.20  SDSS J081507.42+4304  ACIS-S NONE   8.00
 11:53:14.40  +03:26:58.60  SDSS J115314.36+0326  ACIS-S NONE   9.00
 11:57:18.40  +60:03:45.60  SDSS J115718.35+6003  ACIS-S NONE   7.00
 23:58:31.20  -00:22:26.50  SDSS J235831.16-0022  ACIS-S NONE   6.00

===================================================================================

Proposal Number: 06700815            
Proposal Title: A Uniform Chandra Survey of the Brightest and Most Extreme SDSS
BALQSOs

PI: Scott Anderson                 
Subject Category: ACTIVE GALAXIES AND QUASARS                       

Abstract: X-rays are unique probes of BALQSO outflows, and early ROSAT upper
limits first suggested much higher column densities than UV/optical studies.
Harder X-ray data on small heterogeneous sets of bright BALQSOs later measured
columns of 10^23/cm^2 in normal high-ionization outflows, but limited X-ray data
on low-ionization and other extreme BALQSO types suggest yet higher columns, up
to Compton thick. SDSS provides the largest uniform sample of bright BALQSOs,
including both normal and extreme types. We propose new Chandra observations of
13 of the brightest SDSS BALQSOs to: investigate outflows in a uniform sample,
find the best targets for quality follow-on X-ray spectra, and test the link in
extreme cases between their pathology and physical parameters of the outflows.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 08:54:17.60  +53:27:35.30  SDSS J085417.61+5327  ACIS-S NONE   2.00
 09:09:24.00  +00:02:11.00  SDSS J090924.01+0002  ACIS-S NONE   1.50
 09:35:14.70  +03:35:45.70  SDSS J093514.72+0335  ACIS-S NONE   1.50
 09:59:29.90  +63:33:59.90  SDSS J095929.89+6333  ACIS-S NONE   1.50
 10:22:14.80  +02:14:28.80  SDSS J102214.77+0214  ACIS-S NONE   1.50
 12:05:50.20  +02:01:31.60  SDSS J120550.19+0201  ACIS-S NONE   2.00
 14:37:52.80  +04:28:54.50  SDSS J143752.76+0428  ACIS-S NONE   1.50
 23:13:24.50  +00:34:44.50  SDSS J231324.46+0034  ACIS-S NONE   1.00

===================================================================================

Proposal Number: 06700820            
Proposal Title: Deep Imaging of the 300~kpc X-ray jet in the $z=1.18$ quasar
PKS~1127-145

PI: Aneta Siemiginowska            
Subject Category: ACTIVE GALAXIES AND QUASARS                       

Abstract: We propose a deep, 120~ksec Chandra ACIS-S observation of the X-ray jet
discovered in our Chandra AO1 observation of the z=1.187 quasar PKS~1127-145.
This deep image will increase the observable dynamic range in the jet by more
than a factor of 5, allowing for detailed studies of the jet structure and
mapping of spectral variations along the jet. Both are critical to understanding
the physical processes associated with the jet X-ray emission and constraining
theoretical models.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 11:30:07.10  -14:49:27.00  PKS 1127-145          ACIS-S NONE 120.00

===================================================================================

Proposal Number: 06700844            
Proposal Title: X-ray from misaligned FRI jets: IC/CMB emission from a fast
spine?

PI: Rita Sambruna                  
Subject Category: ACTIVE GALAXIES AND QUASARS                       

Abstract: There is evidence that FRI jets have a fast ``spine'', consisting of
relativistically moving plasma, and a slow ``wall'', decelerated by entrainement
of ambient gas. This opens the interesting possibility that inverse Compton
scattering of the CMB photons (IC/CMB) off the relativistic electrons could
contribute to the high-energy emission from the fast spine. This strongly beamed
radiation is visible only in closely aligned FRI jets, i.e., according to
unification schemes, in BL Lac objects. Thus, we propose to observe 2
radio-selected BL Lacs with prominent radio jets to search for IC/CMB X-ray
emission and confirm unification models. This study will impact models for the
origin of the FRI/II division.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 20:05:30.90  +77:52:43.00  2007+777              ACIS-S NONE  40.00

===================================================================================

Proposal Number: 06700944            
Proposal Title: What kind of Jets does Nature make? X-ray characterization of
the FIRST Flat Spectrum Sample

PI: Giovanni Fossati               
Subject Category: ACTIVE GALAXIES AND QUASARS                       

Abstract: The FIRST Flat Spectrum Sample (FFSS) is a deep radio-selected sample,
unbiased with respect to x-ray emission. It is designed to enable us to determine
the true census of the different types of blazars, resolving a long-standing
uncertainty, and the first step towards understanding how Nature makes jets. This
proposal aims to determine the "type" of FIRST blazars, which is easily
determined from radio-optical-X color and basic information about X-ray spectrum
(hardness ratios). Exploratory Chandra-AO4 observations for 13 objects have been
very successful. We propose to complete the sample by observing the remaining 31
sources for which no X-ray information currently exists. With this information we
will be able to answer the key question: "What kind of jets does Nature make?"

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 07:17:51.80  +45:38:03.40  S4 0714+45            ACIS-S NONE   7.00
 07:41:38.50  +44:04:04.80  B3 0738+441           ACIS-S NONE   3.00
 08:43:59.20  +51:05:25.60  87GB 0840+5116        ACIS-S NONE   3.00
 09:15:28.80  +44:16:33.00  87GB 0912+4429        ACIS-S NONE   6.00
 09:32:41.10  +53:06:33.70  S4 0929+533           ACIS-S NONE   6.00
 09:39:49.60  +41:41:54.40  FIRST J093949.6+4141  ACIS-S NONE   7.00
 11:45:38.50  +44:20:21.90  87GB 1143+4437        ACIS-S NONE   7.00
 12:29:09.30  +55:22:30.70  87GB 1226+5539        ACIS-S NONE   5.00
 12:37:57.90  +22:34:30.40  87GB 1235+2251        ACIS-S NONE   5.00
 12:45:57.80  +22:32:05.40  87GB 1243+2248        ACIS-S NONE   3.00
 13:14:58.40  +56:03:42.00  87GB 1312+5619        ACIS-S NONE   6.00
 13:17:39.20  +41:15:46.00  FIRST J131739.2+4115  ACIS-S NONE   3.00
 13:52:17.80  +31:26:46.50  87GB 1350+3141        ACIS-S NONE   3.00
 14:39:05.20  +44:10:07.10  87GB 1437+4423        ACIS-S NONE   6.00
 14:49:20.70  +42:21:01.40  87GB 1447+4233        ACIS-S NONE   4.00
 15:00:48.70  +47:51:15.60  87GB 1459+4803        ACIS-S NONE   5.00
 15:49:12.30  +30:47:16.50  FIRST J154912.3+3047  ACIS-S NONE   4.00
 16:24:32.20  +56:52:28.20  87GB 1623+5659        ACIS-S NONE   4.00

===================================================================================

Proposal Number: 06700972            
Proposal Title: Exploring the X-ray--TeV connection in BLLacs at short
timescales

PI: Luigi Costamante               
Subject Category: ACTIVE GALAXIES AND QUASARS                       

Abstract: We propose to perform up to 2 ToO simultaneous observations in the
X-ray and TeV range with Chandra and H.E.S.S., triggered by a TeV flux level high
enough to constrain both spectra on hour timescales or less. Our goal is to
investigate with unprecedented detail the intra-night and sub-hour variability in
TeV flaring blazars, and to shed light onto the relation between the two
emissions, whose usual correlation has been questioned by recent results (e.g.
1ES 1959+650).

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
                            TeV flaring BLLac     ACIS-S NONE  30.00

===================================================================================

Proposal Number: 06700990            
Proposal Title: A Study of the Physics of Extended Relativistic X-ray Jets,
Discovered in our Chandra Survey

PI: Jonathan Gelbord               
Subject Category: ACTIVE GALAXIES AND QUASARS                       

Abstract: We will measure the changing flow speeds, magnetic fields, and energy
fluxes in six well-resolved quasar jets found in our short-exposure Chandra
survey by combining new, deep Chandra data with radio and optical imaging. We
will image each jet with sufficient sensitivity to estimate beaming factors and
magnetic fields in several distinct regions, and so map the variations in these
parameters down the jets. HST observations will help diagnose the role of
synchrotron emission in the overall SED, and may reveal condensations on scales
less than 0.1 arcsec.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 09:22:46.40  -39:59:35.10  PKS 0920-397          ACIS-S NONE  45.00
 10:33:07.70  -36:01:56.90  PKS 1030-357          ACIS-S NONE  30.00
 10:58:17.90  +19:51:50.90  PKS 1055+201          ACIS-S NONE  35.00
 14:24:32.20  -49:13:50.00  PKS 1421-490          ACIS-S NONE  54.00
 21:05:01.20  -48:48:46.50  PKS 2101-490          ACIS-S NONE  45.00

===================================================================================

Proposal Number: 06701011            
Proposal Title: The evolution of AGN: Chandra Imaging of protoclusters
associated with high redshift radio galaxies

PI: laura pentericci               
Subject Category: ACTIVE GALAXIES AND QUASARS                       

Abstract: We propose medium deep ACIS-S observations of four high redshift radio
galaxy protoclusters at z~3 and 1 at z~4. Chandra allows an unbiased census of
the AGN contents in these galaxy protoclusters that are believed to be the
progenitors of rich clusters of galaxies. Combined with our ground- and
space-based optical/NIR/submm/radio data we will investigate the linkage between
starburst activity, galaxy/cluster formation and AGN, and study the evolution of
the AGN fraction in galaxy clusters out to z>4

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 03:18:12.00  -25:35:11.00  mrc0316-257           ACIS-S NONE  40.00
 13:38:26.10  -19:42:31.10  tnj1338-194           ACIS-S NONE  80.00

===================================================================================

Proposal Number: 06701060            
Proposal Title: The X-ray Flares of Knot 'HST-1' in the M87 Jet (monitoring)

PI: John Biretta                   
Subject Category: ACTIVE GALAXIES AND QUASARS                       

Abstract: We request a continuation of our monitoring of the M87 jet. The primary
driver is the large X-ray/Optical outburst of the jet knot, HST-1. Both the
optical and X-ray intensities have increased by a factor of 15 during the last
few years, To test our detailed emission models, we need to track the lightcurve
during a decay. Many of the characteristics of these events are similar to blazar
variability but HST-1 is clearly resolved from the nuclear emission of M87 at a
projected distance of 60pc. In addition to our regular 7 observations separated
by 6 week intervals, we are requesting 5 on a weekly basis, and one in continuous
clocking mode to pin down the spectral parameters which are now compromised by
ACIS pileup.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 12:30:49.00  +12:23:30.00  M87                   ACIS-S NONE   5.00
 12:30:49.00  +12:23:30.00  M87                   ACIS-S NONE   5.00
 12:30:49.00  +12:23:30.00  M87                   ACIS-S NONE   5.00
 12:30:49.00  +12:23:30.00  M87                   ACIS-S NONE   5.00
 12:30:49.00  +12:23:30.00  M87                   ACIS-S NONE   5.00
 12:30:49.00  +12:23:30.00  M87                   ACIS-S NONE   5.00
 12:30:49.00  +12:23:30.00  M87                   ACIS-S NONE   5.00
 12:30:49.00  +12:23:30.00  M87                   ACIS-S NONE   5.00
 12:30:49.00  +12:23:30.00  M87                   ACIS-S NONE   5.00
 12:30:49.00  +12:23:30.00  M87                   ACIS-S NONE   5.00
 12:30:49.00  +12:23:30.00  M87                   ACIS-S NONE   5.00
 12:30:49.00  +12:23:30.00  M87                   ACIS-S NONE   5.00

===================================================================================

Proposal Number: 06701061            
Proposal Title: A Multiwavelength Study of POX 52, a Dwarf Seyfert Galaxy with
an Intermediate Mass Black Hole

PI: Aaron Barth                    
Subject Category: ACTIVE GALAXIES AND QUASARS                       

Abstract: POX 52 is a Seyfert 1 galaxy with unprecedented properties: its host
galaxy is a dwarf elliptical, and its stellar velocity dispersion is only 36
km/s. The stellar velocity dispersion and the broad emission-line widths both
suggest a black hole mass of order 10^5 solar masses. We request HST ACS/HRC
imaging to perform a definitive measurement of the host galaxy structure; STIS UV
and optical spectroscopy to study the nonstellar continuum and the structure of
the broad-line region; and Chandra ACIS imaging to investigate the spectral and
variability properties of the X-ray emission. The results of this program will
give a detailed understanding of the host galaxy and accretion properties of one
of the very few known black holes in the mass range around 10^5 solar masses.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 12:02:56.90  -20:56:03.00  POX 52                ACIS-S NONE  25.00

***********************************************************************************
CLUSTERS OF GALAXIES                              
--------------------------------------------------

===================================================================================

Proposal Number: 06800010            
Proposal Title: A Chandra Study of the Unusual Galaxy Cluster A1569

PI: Stephen Murray                 
Subject Category: CLUSTERS OF GALAXIES                              

Abstract: We propose to observe the galaxy cluster A1569, an object which shows a
high level of dynamical activity in its X-ray morphology, and which harbours two
bright radio galaxies: a central WAT located between two X-ray peaks, and a more
prototypical FRI at the periphery. This observation will allow us to gain a
deeper understanding of the relationship between radio galaxies and the ICM, and
will give insights into the debated link between cluster mergers and the WAT
phenomenon. We will measure the thermodynamic parameters of the gas and search
for interactions (shocks, shells, and cavities) of the gas with the radio
plasma.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 12:36:18.00  +16:35:30.00  Abell 1569            ACIS-I NONE  40.00

===================================================================================

Proposal Number: 06800018            
Proposal Title: Chandra observations of high-redshift clusters of galaxies from
the 400 Square Degrees ROSAT PSPC survey

PI: Stephen Murray                 
Subject Category: CLUSTERS OF GALAXIES                              

Abstract: We request Chandra observations of a complete sample of z>0.35 galaxy
clusters from the 400 Square Degrees ROSAT PSPC Survey. The goal of this GTO
program is to collect ACIS-I data for the entire sample with at least 20 ksec
exposures. The data will be used to measure accurate X-ray luminosities and
estimate the gas mass within 1Mpc. These parameters will be used as proxies for
the total virial mass which will lead to preliminary estimates of the mass
functions in several redshift bins. The evolution of the mass function will place
contraints on several cosmological parameters. There is the accompanying GO
proposal (PI Vikhlinin) to observe the same sample with longer exposures to
improve reliability of the cosmological measurements. Our GTO and GO programs are
not in conflict.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 01:41:32.30  -30:34:42.00  cl0141-3034           ACIS-I NONE  30.00
 01:59:18.20  +00:30:09.00  cl0159+0030           ACIS-I NONE  20.00
 03:18:33.40  -03:02:56.00  cl0318-0302           ACIS-I NONE  15.00
 03:40:51.60  -28:23:10.00  cl0340-2823           ACIS-I NONE  25.00
 08:09:41.00  +28:11:58.00  cl0809+2811           ACIS-I NONE  20.00
 09:58:19.30  +47:02:17.00  cl0958+4702           ACIS-I NONE  25.00
 10:02:07.60  +68:58:49.00  cl1002+6858           ACIS-I NONE  20.00
 10:03:04.50  +32:53:36.00  cl1003+3253           ACIS-I NONE  20.00
 11:20:07.60  +43:18:07.00  cl1120+4318           ACIS-I NONE  20.00
 13:12:19.40  +39:00:58.00  cl1312+3900           ACIS-I NONE  30.00
 13:34:20.30  +50:31:05.00  cl1334+5031           ACIS-I NONE  20.00
 16:14:11.50  +34:25:25.00  cl1614+3425           ACIS-I NONE  35.00

===================================================================================

Proposal Number: 06800045            
Proposal Title: Alternate: The Eclipsing Binary ET Tau

PI: Gordon Garmire                 
Subject Category: CLUSTERS OF GALAXIES                              

Abstract: We propose to observe the eclipsing binary ET Tau. The primary star in
this system is a spectral type B8, but very little is known about the companion
due to significant obscuration (bII ~ -2.3 degrees). We suspect that it is a
low-mass star, and likely an X-ray source. It is undetected in the RASS, but this
is not surprising since it the ROSAT band extended only to 2.4 keV, and most of
this emission would be lost to photoelectric absorption. (Since it is a fairly
crowded field we require the spatial resolution of Chandra rather than the
soft-band sensitivity of XMM-Newton.) We propose a short 10 ks snapshot of this
system in order to gauge the worth of a long duration Chandra observation in GO7
which would be appropriately timed to probe its 6-day period.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 05:37:40.90  +27:16:16.60  ET Tau                ACIS-S NONE  10.00

===================================================================================

Proposal Number: 06800073            
Proposal Title: X-ray emission from clusters of galaxies from the REFLEX sample.

PI: Peter Predehl                  
Subject Category: CLUSTERS OF GALAXIES                              

Abstract: We propose to observe in GTO time several clusters of galaxies from the
REFLEX sample.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 12:53:40.90  -39:31:55.20  RXCJ1253.6-3931       ACIS-S NONE  10.00
 22:51:47.60  -32:06:12.20  RXCJ2251.7-3206       ACIS-S NONE  10.00

===================================================================================

Proposal Number: 06800101            
Proposal Title: DARK ENERGY WITH X-RAY CLUSTERS: CHANDRA OBSERVATIONS OF 41
HIGH-REDSHIFT CLUSTERS FROM THE 400 deg^2 ROSAT PSPC SURVEY

PI: Alexey Vikhlinin               
Subject Category: CLUSTERS OF GALAXIES                              

Abstract: We propose Chandra observations to measure temperature and gas mass in
a sample of 41 high-z galaxy clusters from our 400 deg^2 ROSAT survey. This
sample is comparable in number to all clusters in the local Universe (z<0.1)
above a similar limiting mass, and covers a factor of 3 larger volume at z=0.4-1.
Chandra observations will provide the total mass function estimates at =0.4,
0.5, and 0.65, which can be directly compared with the local measurements at
=0.05. These data will provide a measurement of the dark energy equation of
state via the cluster evolution test which is completely independent from SN Ia
and CMB and has different degeneracies. Some targets in this proposal are in
common with the HRC GTO proposal 06900018. These programs are not in conflict.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 00:30:33.60  +26:18:16.00  cl0030+2618           ACIS-I NONE  20.00
 02:16:33.70  -17:47:27.00  cl0216-1747           ACIS-I NONE  65.00
 02:30:26.60  +18:36:22.00  cl0230+1836           ACIS-I NONE  70.00
 03:28:36.10  -21:40:04.00  cl0328-2140           ACIS-I NONE  60.00
 03:33:10.30  -24:56:40.00  cl0333-2456           ACIS-I NONE  40.00
 03:55:59.30  -37:41:46.00  cl0355-3741           ACIS-I NONE  30.00
 04:05:24.30  -41:00:15.00  cl0405-4100           ACIS-I NONE  80.00
 05:21:10.50  -25:30:36.00  cl0521-2530           ACIS-I NONE  15.00
 08:53:13.40  +57:59:44.00  cl0853+5759           ACIS-I NONE  25.00
 09:56:02.80  +41:07:08.00  cl0956+4107           ACIS-I NONE  40.00
 12:02:13.70  +57:51:53.00  cl1202+5751           ACIS-I NONE  60.00
 12:12:19.20  +27:33:13.00  cl1212+2733           ACIS-I NONE  15.00
 12:22:01.90  +27:09:19.00  cl1222+2709           ACIS-I NONE  50.00
 13:57:19.40  +62:32:42.00  cl1357+6232           ACIS-I NONE  45.00

===================================================================================

Proposal Number: 06800102            
Proposal Title: A CHANDRA TREASURY OBSERVATION OF THE BEST EXAMPLE OF A CLUSTER
COLD FRONT

PI: Alexey Vikhlinin               
Subject Category: CLUSTERS OF GALAXIES                              

Abstract: We propose a 450 ksec observation of A3667, the best example of a
cluster cold front. A deep image of the best cold front by the highest angular
resolution X-ray telescope will push the study of the physics of the intracluster
medium to the limit. Our main goals are 1) to observe the turbulence in the
intracluster medium by direct imaging of any perturbations of the front surface;
2) to study transport processes in the ICM using the gas density and temperature
profiles across the front with a spatial resolution of 1/5 of the Coulomb mean
free path; 3) to characterize the magnetic field structure by mapping the onset
of the Kelvin-Helmholtz instability. The proposed deep Chandra image of A3667
will be one of the treasury images of the X-ray astronomy.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 20:12:50.80  -56:50:53.90  Abell 3667            ACIS-I NONE 110.00
 20:12:50.80  -56:50:53.90  Abell 3667            ACIS-I NONE 170.00
 20:12:50.80  -56:50:53.90  Abell 3667            ACIS-I NONE 170.00

===================================================================================

Proposal Number: 06800198            
Proposal Title: Cluster Strong Lensing at High Redshift

PI: Michael Gladders               
Subject Category: CLUSTERS OF GALAXIES                              

Abstract: The Red-Sequence Cluster Survey has discovered a total of 8 strong
lensing clusters, of which 3 show multiple arcs due to lensing of multiple
background objects at various redshifts. All of these clusters are above z=0.64.
The high multiplicity ratio, and the redshift distribution, is in clear
contradiction to the latest cosmological arc predictions in the currently favored
"concordance" cosmology. Understanding these high redshift lensing clusters is
thus crucial, and will inform the study of clusters as a whole. Chandra, with its
exquisite resolution, is the best tool for direct observation of possible causes
for this lensing boost. In this proposal, we request a deep observation of the
most distant and most massive RCS multiple arc cluster: RCS2319.9+0038 at
z=0.905.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 23:19:53.90  +00:38:11.60  RCS2319.9+0038        ACIS-S NONE  75.00

===================================================================================

Proposal Number: 06800209            
Proposal Title: Chandra observations of clusters of galaxies containing fossil
radio sources

PI: Matteo Murgia                  
Subject Category: CLUSTERS OF GALAXIES                              

Abstract: We propose Chandra observations of three galaxy clusters which harbor
fossil radio galaxies recently discovered by us in the radio. Fossil radio
sources are very rare objects. We argue that their intriguing association with
clusters implies that the pressure of the dense intracluster medium (perhaps a
cooling flow) prevents quick liquidation of a fossil radio lobe through adiabatic
expansion. We will use the proposed observations to test this hypothesis and to
compare the actual fading radio structures with the X-ray image, expecting to
find cavities in the intracluster gas. We intend to establish an interaction
history sequence in which our fossil sources are the progenitors of `ghost'
bubbles, i.e. X-rays cavities that are not associated with the central radio
source.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 18:52:08.30  +57:11:43.50  RXC J1852.1+5711      ACIS-I NONE  30.00

===================================================================================

Proposal Number: 06800267            
Proposal Title: X-ray Properties of a Mass-Selected Group Catalog

PI: Pasquale Mazzotta              
Subject Category: CLUSTERS OF GALAXIES                              

Abstract: The observed X-ray luminosities of groups are inconsistent with pure
shock-heated gas model. It is thought that a combination of pre-heating, gas
cooling and energy injection act to remove low entropy gas. However, the extent
of these processes is uncertain because the previous selection of group catalogs
have been based on X-ray emission. We have constructed a complete, mass-selected
catalog of 18 groups from the 2dFGRS. X-ray observations of this sample would for
the first time provide accurate determinations of the entropy in a mass-selected
sample. This project was highly ranked by last year Chandra and XMM tacs. In
return twelve groups have been accepted for observation. Here we propose the
observation of the remaining 6 groups to complete the sample.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 00:11:20.00  -28:52:19.00  2PIGGz0.061 J0011.5-  ACIS-I NONE  20.00
 03:11:26.00  -26:55:44.00  2PIGGz0.068 J0311.8-  ACIS-I NONE  40.00
 22:27:49.00  -30:34:40.00  2PIGGz0.058 J2227.0-  ACIS-I NONE  22.00

===================================================================================

Proposal Number: 06800337            
Proposal Title: The Outburst in Hercules A

PI: Paul Nulsen                    
Subject Category: CLUSTERS OF GALAXIES                              

Abstract: In the standard model of expanding radio sources, cocoon shocks expand
around radio lobes, powered by jets from an AGN. There is a strong case that
cocoon shocks in the ICM around the radio source Hercules A are responsible for
its unusual X-ray appearance. We propose a 100 ksec observation of Hercules to
confirm these shocks and determine their properties. The new X-ray data will be
used to determine basic shock properties, including energy, and the enthalpy of
the cavities in Hercules A. These quantities constrain the history of energy
injection by the radio source. Deep X-ray observations of Hercules A will provide
new insights into the nature of this radio sources and radio sources in general.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 16:51:08.20  +04:59:33.80  Hercules A            ACIS-S NONE 100.00

===================================================================================

Proposal Number: 06800355            
Proposal Title: The Interaction between Cluster Central Radio Sources and
Cooling Flows

PI: Craig Sarazin                  
Subject Category: CLUSTERS OF GALAXIES                              

Abstract: We propose Chandra observations of 2 bright cooling core clusters
(A2063 & AWM4) with central radio sources. We will image the interaction region
with the radio source, and to determine the physical state of the X-ray gas.
Previous Chandra images (e.g., A2052) show radio bubbles, with X-ray holes at the
radio lobes surrounded by bright X-ray rims. Our short ACIS-I image of A2063, one
of our targets, already shows evidence for holes. The X-ray gas may confine radio
lobes, deflect radio jets, and produce Faraday rotation. The radio lobes may
displace and compress the X-ray gas; this may trigger star formation. We will
determine the energetics of the radio source and the possible contribution of
radio heating to balance X-ray cooling. We will also derive the overall cooling
core properties.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 15:23:05.30  +08:36:31.90  A2063                 ACIS-S NONE  41.00

===================================================================================

Proposal Number: 06800392            
Proposal Title: Chandra study of the first strong-lens selected cluster of
galaxies and the lens system

PI: Naohisa Inada                  
Subject Category: CLUSTERS OF GALAXIES                              

Abstract: We propose to observe SDSS J1004+4112, the first and unique strongly
lensed quasar system due to a cluster of galaxies, at X-ray wavelengths using the
ACIS-S. Our goals include: 1) constraining the properties of the first
strong-lens selected cluster, 2) determining the magnification ratios of the 4
quasar images at X-ray wavelengths, 3) constraining the intensity of the cluster
Fe-K emission line for the future study. The existence of 4 bright X-ray sources
(4 quasar images) behind the core of a cluster provides a unique observational
opportunity. Combined with our other observations (Astro-E2, Subaru, Nobeyama), a
Chandra observation of this system promises a wealth of important cosmological
information. Based on MARX simulations, we request an exposure time of 80 ks.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 10:04:34.00  +41:12:43.00  SDSS J1004+4112       ACIS-S NONE  80.00

===================================================================================

Proposal Number: 06800407            
Proposal Title: A detailed Chandra Study of the cluster with the most luminous
cooling core at z>0.25

PI: Hans Boehringer                
Subject Category: CLUSTERS OF GALAXIES                              

Abstract: RXCJ1504.1-0248 discovered at z=0.2153 in the REFLEX survey is the most
X-ray luminous known cluster in the southern sky below z=0.4. A 13ks CHANDRA
snap-shot reveals a global kT=10keV, 5.5keV at the center, but no lower
temperatures and no increase of Fe abundance towards the center. The formal mass
deposition rate is the 2nd highest found sofar. With a deeper exposure we can
obtain a detailed temperature-profile, test the central region for a multi-phase
temperature structure to check for disturbances by interaction effects, the
morphology of the central region to check indications of asymmetry, to use the Fe
abundance distribution to learn more about the enrichment age of the cooling
core, and to test how far Fe enrichment of the central galaxy gas been
transported outwards.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 15:04:07.70  -02:48:18.00  RXCJ1504.1-0248       ACIS-I NONE  40.00

===================================================================================

Proposal Number: 06800426            
Proposal Title: Dark Matter in Isolated Ellipticals and Groups

PI: Gordon Garmire                 
Subject Category: CLUSTERS OF GALAXIES                              

Abstract: We propose to observe a sample of elliptical galaxies and galaxy groups
in order to map their dark matter content. Specifically we target the sole
unobserved group in the Jones et al. (2003) sample (RX J1119.7+2126; MNRAS 343,
627), and the four isolated galaxies in the Colbert et al. (2001) sample (ApJ
121, 808) which show no significant dust obscuration or substructure. The first
of these will be observed for 50 ks which will be sufficient to measure the
temperature profile of the hot plasma to 10%, enabling the construction of a
deprojected total mass profile. The remaining isolated galaxies will be observed
for 20 ks each to determine their feasibility for mass reconstructions from
longer GO7 observations.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 01:58:42.10  +08:20:47.70  NGC766                ACIS-S NONE  20.00
 10:20:38.50  +25:30:17.40  NGC3209               ACIS-S NONE  20.00
 11:19:43.70  +21:26:50.00  RXJ1119.7+2126        ACIS-S NONE  50.00

===================================================================================

Proposal Number: 06800427            
Proposal Title: HI-Deficient Ultracompact Groups

PI: Trevor Ponman                  
Subject Category: CLUSTERS OF GALAXIES                              

Abstract: It now seems that the morphology-density relation is established by
processes operating within groups, and only subsequently incorporated into
clusters. The discovery that the HI-deficiency observed in galaxies within
compact groups is related to the presence of a hot intergalactic medium, offers a
clue to the processes involved in the transformation of the galaxy population.
Several of the most HI-deficient groups are extraordinarily compact, and we
propose to image these with Chandra to study the relationship between their hot
gas content, the HI distribution mapped by the VLA, and the star forming
properties of their galaxies. This will enable us to discriminate between ram
pressure stripping, tidal stripping and starburst mechanisms for the removal of
gas from galaxies.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 09:13:35.60  +30:00:51.00  HCG 37                ACIS-S NONE  20.00
 09:38:54.50  -04:51:07.00  HCG 40                ACIS-S NONE  50.00

===================================================================================

Proposal Number: 06800428            
Proposal Title: First X-ray Observation of Two High Redshift Lensing Clusters
from the Optically Selected LCDCS Sample

PI: Gordon Garmire                 
Subject Category: CLUSTERS OF GALAXIES                              

Abstract: We propose to use Chandra to observe two galaxy clusters discovered in
an optical survey: the LCDCS. These clusters have been confirmed as
gravitationally bound objects by recent clear detections of strong lensing
features. This would be the first X-ray observation of these high redshift
clusters (z=0.61,67) allowing us a direct comparison of their X-ray properties
with the ones from the RCS sample. The Chandra observations proposed here will
also be used as ``calibration'' for future deeper exposures of a larger sample of
LCDCS clusters which scientific aim is explain the discrepancy between measured
and predicted lensing rates, by comparing mass profiles and degree of
substructures of lensing and non lensing clusters from the same sample.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 14:20:29.70  -11:34:04.00  LCDCS 954             ACIS-S NONE  30.00

===================================================================================

Proposal Number: 06800443            
Proposal Title: A detailed study of a z>1 galaxy cluster

PI: Laurence Jones                 
Subject Category: CLUSTERS OF GALAXIES                              

Abstract: We propose Chandra/ACIS (130ks) + XMM/EPIC (100ks) observations of a
cluster at z=1.05, recently detected in the XMM-LSS survey, to measure the
properties of the X-ray gas and dark matter as part of a detailed
multi-wavelength study. This is only the sixth X-ray selected cluster known at
z>1. It appears to have a relaxed X-ray morphology outside the core, making it
almost unique at high-z. The observations will give detailed, accurate
measurements of the morphology, total mass and gas mass fraction for the first
time. Uniquely, we will trace the surface brightness and temperature structure
from the core to the virial radius, to give an accurate total mass and thus a
benchmark point in the cluster scaling relations at z=1, a vital component of
cosmological studies using X-ray clusters.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 02:24:04.10  -04:13:28.90  XLSSJ022404.0-041328  ACIS-S NONE 130.00

===================================================================================

Proposal Number: 06800449            
Proposal Title: X-ray Emission from Optically-Selected, High-Redshift Galaxy
Clusters from the RCS Survey

PI: Gordon Garmire                 
Subject Category: CLUSTERS OF GALAXIES                              

Abstract: We propose to continue our study of optically-selected, high-redshift
(z ~1) galaxy clusters from the RCS survey, which prior CXO observations have
shown to be relatively underluminous for their optical richness. Here we propose
a 50ks observation of RCS1107.3-0523 (z=0.72); we aim to determine the cluster
luminosity and constrain the cluster temperature, and move to completion of a
Chandra survey of a uniformly selected sample of high-redshift, optically
selected clusters.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 11:07:18.00  -05:22:60.00  RCS1107.3-0523        ACIS-S NONE  50.00

===================================================================================

Proposal Number: 06800490            
Proposal Title: The supercluster-scale filament of galaxies ZwCl 2341.1+0000 at
z=0.3

PI: Somak Raychaudhury             
Subject Category: CLUSTERS OF GALAXIES                              

Abstract: We propose to jointly observe with Chandra/ACIS and XMM/EPIC the unique
large-scale filamentary network of galaxies associated with the cluster
ZwCl~2341.1+0000 at z=0.3 discovered from the NVSS radio survey. Our
optical/radio data show that it is at least 10 Mpc in extent, and appears to be a
supercluster in formation.It is the only known supercluster-scale filament
structure where both (RASS) x-rays and evidence of intergalactic magnetic field
have been detected. Shocks from forming large structures can accelerate particles
to these very high energies. We wish to detect thermal bremsstrahlung from this
filament as predicted from our simulations, which also predict micro-gauss
magnetic fields, and explore the role of shock-heating in the intergalactic
medium.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 23:43:39.60  +00:19:40.30  ZwCl 2341.1+0000      ACIS-S NONE  30.00

===================================================================================

Proposal Number: 06800498            
Proposal Title: The Complex Radio-Galaxy/ICM interaction in A4059

PI: Christopher Reynolds           
Subject Category: CLUSTERS OF GALAXIES                              

Abstract: We propose a 100ks ACIS-S observation of the radio-galaxy/ICM
interaction in Abell 4059. Our previous (cycle-1) observation showed this
interaction to be dramatic and complex, with large "ghost" cavities resulting
from a previous powerful outburst of the radio-galaxy PKS2354-35. We also
discovered clear radial gradients in ICM temperature and metallicity. The new
observations will double the signal-to-noise and allow us to take our
investigation to the next level of sophistication. By making detailed temperature
and metallicity maps, we will search for signs of radio galaxy induced heating
and/or mixing of the ICM. We will also constrain models for the curious
"south-west ridge" first noted by Huang & Sarazin.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 23:56:60.00  -34:45:33.00  ABELL 4059            ACIS-S NONE 100.00

===================================================================================

Proposal Number: 06800562            
Proposal Title: Fossil groups in the local Universe

PI: Alastair Sanderson             
Subject Category: CLUSTERS OF GALAXIES                              

Abstract: In a hierarchically evolving universe, the oldest and most undisturbed
galaxy systems are low mass groups which have not yet been absorbed into larger
halos. Such 'fossil groups' consist of a giant elliptical galaxy embeded in a
large, group-scale halo of hot gas. Only a handful of these objects have been
studied so far, and their properties point to their being repositories of the
lowest entropy and least disrupted intergalactic gas present in collapsed halos.
We propose to observe two of the closest known fossil groups, in order to
establish their properties as a class. Moreover, these observations will enable
us to probe gas physics in conditions which are uniquely susceptible to radiative
cooling instabilities, thereby providing a critical test of gas heating and
feedback models.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 00:09:35.50  -32:16:37.00  IC 1531               ACIS-S NONE  40.00
 00:54:59.90  -35:19:17.00  ESO 351-021           ACIS-S NONE  40.00

===================================================================================

Proposal Number: 06800613            
Proposal Title: The History of AGN Activity in M87 and the Interaction of
Nuclear Outbursts with the Surrounding Atmosphere

PI: William Forman                 
Subject Category: CLUSTERS OF GALAXIES                              

Abstract: We propose a 500 ksec ACIS-I observation to study the interaction
between energy outbursts from the supermassive black hole (SMBH) in M87 and its
surrounding gaseous atmosphere. We will inventory the plasma bubbles inflated by
the SMBH, search for weak shocks, study the interaction of relativistic plasma in
bubbles with the surrounding hot gas, measure turbulence in the cluster gas,
study the microphysics of the interaction between the plasma in the bubbles and
the surrounding gas, and estimate the gas viscosity by measuring the width of
shock fronts. By determining the energy associated with bubbles and shocks, we
can chronicle the mechanical power output of the SMBH. Finally we will study
particle acceleration and cooling models by measuring inter-knot spectra along
the jet.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 12:30:49.50  +12:23:28.00  M87                   ACIS-I NONE  12.00
 12:30:49.50  +12:23:28.00  M87                   ACIS-I NONE 160.00
 12:30:49.50  +12:23:28.00  M87                   ACIS-I NONE 170.00
 12:30:49.50  +12:23:28.00  M87                   ACIS-I NONE 170.00

===================================================================================

Proposal Number: 06800721            
Proposal Title: A Deep Observation of a Radio-Quiet Cooling Flow

PI: Megan Donahue                  
Subject Category: CLUSTERS OF GALAXIES                              

Abstract: We propose to follow-up our recent Chandra observation of a cluster
that is uniquely suited to providing a simple test of cluster cooling models.
With current data, we show that A1650 has a short cooling time in its core, a
peaked surface brightness distribution, and dual-phase core gas, yet does not
exhibit a radio source or an emission-line nebula. Therefore this cluster
presents the simplest example of the phenomenon, free of obfuscating factors, and
may represent a pre-``catastrophe'' phase. Its cool gas is 2-3x cooler than that
in other cooling flows and it presents a strong metallicity gradient. Deep
observations will reveal the location and the thermal nature of the soft phase
and the iron emission, variations in Type Ia/II abundance patterns, and
temperature and abundance maps.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 12:58:41.30  -01:45:41.00  Abell 1650            ACIS-S NONE  30.00
 12:58:41.30  -01:45:41.00  Abell 1650            ACIS-S NONE 170.00

===================================================================================

Proposal Number: 06800802            
Proposal Title: The Creation of the Intracluster Medium in High-z Galaxy
Clusters

PI: Spencer Stanford               
Subject Category: CLUSTERS OF GALAXIES                              

Abstract: We propose to observe a newly discovered galaxy cluster around the
radio galaxy 3C 210 at z=1.17. We intend to obtain a 20 ksec ACIS exposure to
identify point sources, which can severely bias measurements of extended emission
in high-z clusters, and to study the radio galaxy itself. We also ask to obtain a
100 ksec EPIC exposure to measure the properties of the intracluster medium
including its X-ray temperature and morphology. These observations will help to
understand the way that galaxy clusters create an ICM as they evolve from the
protoclusters recently discovered at 2 < z < 4, and to act as a pathfinder for
the future exploitation of high redshift galaxy clusters in understanding dark
energy.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 08:58:09.90  +27:50:52.00  3C 210                ACIS-S NONE  20.00

===================================================================================

Proposal Number: 06800853            
Proposal Title: MACS: The most massive galaxy clusters at z>0.3

PI: Harald Ebeling                 
Subject Category: CLUSTERS OF GALAXIES                              

Abstract: We propose the continuation of our ACIS-I survey of the most distant,
very X-ray luminous clusters detected in the MACS Survey. Comprising the high-z
counterparts of the best-studied massive local systems (from e.g. the BCS), and -
at the same time - the high-mass counterparts of the large body of X-ray
selected, distant poor clusters (from e.g. the 400d survey), this sample
represents a unique opportunity to extend significantly the redshift and mass
baseline of cosmological and physical cluster studies. The proposed observations
will 1) provide reliable cluster fluxes, luminosities, global temperatures, and
total mass estimates for cosmological studies of cluster evolution; and 2)
identify, for future in-depth study, the most extreme clusters in an M-z range
unprobed by any other survey.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 01:59:04.80  -34:12:50.50  MACSJ0159.0-3412      ACIS-I NONE  10.00
 03:26:49.50  -00:43:41.50  MACSJ0326.8-0043      ACIS-I NONE  10.00
 04:51:55.00  +00:06:14.50  MACSJ0451.9+0006      ACIS-I NONE  10.00
 04:55:17.50  +06:57:55.50  MACSJ0455.2+0657      ACIS-I NONE  10.00
 05:53:26.70  -33:42:37.00  MACSJ0553.4-3342      ACIS-I NONE  10.00
 10:06:55.60  +32:00:57.00  MACSJ1006.9+3200      ACIS-I NONE  10.00
 11:05:46.00  -10:14:29.00  MACSJ1105.7-1014      ACIS-I NONE  10.00
 13:59:09.90  -19:29:07.50  MACSJ1359.1-1929      ACIS-I NONE  10.00
 15:42:03.20  -29:15:16.50  MACSJ1542.0-2915      ACIS-I NONE  10.00
 20:46:01.30  -34:30:04.50  MACSJ2046.0-3430      ACIS-I NONE  10.00
 22:19:09.40  -18:44:54.00  MACSJ2219.1-1844      ACIS-I NONE  10.00

===================================================================================

Proposal Number: 06800883            
Proposal Title: The Galaxy Cluster Mass-T_x Relation at High Redshift

PI: Spencer Stanford               
Subject Category: CLUSTERS OF GALAXIES                              

Abstract: We propose to obtain ACIS and EPIC observations of an X-ray selected
cluster of galaxies from the ROSAT Distant Cluster Survey (RDCS). From the
combined Chandra and Newton data we will determine the X-ray temperature (T_x) of
the intracluster gas, thus completing our measurement of T_x for all 10 z>0.8
clusters found in the RDCS. We will use these combined observations to achieve
the following science goals: 1) determine the temperature function for a complete
sample of 10 clusters in the RDCS with z>0.8, and 2) calibrate the cluster total
mass--T_x relation at these high redshifts.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 03:37:24.70  -34:57:29.00  RX J0337-3457         ACIS-I NONE  20.00

===================================================================================

Proposal Number: 06800913            
Proposal Title: Entropy in low mass galaxy clusters out to moderate radii

PI: Edward Lloyd-Davies            
Subject Category: CLUSTERS OF GALAXIES                              

Abstract: In simple models of structure formation, involving gravitational
collapse and shock heating, the properties of galaxy clusters are expected to
follow simple scaling relations dependent only on system mass. Observations show
deviations from these scaling relations, which are usually attributed to the
presence of excess entropy, so theoretical models were devised to explain this.
We can discriminate between competing models by determining the radial entropy
profiles out to several core radii, for the clusters we proposed to observe. We
will analyse these observation in conjunction with archive Chandra data for rich
clusters and XMM-Newton observations of groups, thereby constraining the models
over a large mass range.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 05:16:37.40  +06:26:31.60  Abell 539             ACIS-I NONE  40.00

===================================================================================

Proposal Number: 06800915            
Proposal Title: Cygnus A --- Shock Heating of the Intra-Cluster Medium

PI: Andrew Young                   
Subject Category: CLUSTERS OF GALAXIES                              

Abstract: We propose a 200 ksec observation of Cygnus A with the primary goal of
unambiguously showing that the expanding cavity around Cygnus A is shock heating
the intra-cluster medium and transferring tremendous quantities of energy, in the
form of heat, to the cluster core. Cygnus A is unique among cooling flow clusters
because the radio source is so young and powerful, and has produced a single
football-shaped cavity that envelops the whole source. As such Cygnus A is the
"cleanest" example of a radio galaxy interacting with the intra-cluster medium.
Secondary science goals include the study of the synchrotron self-Compton
emission of the hot spots, the jet morphology, spectrum and precession, and the
cold gas falling through the cavity toward the nucleus.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 19:59:28.30  +40:44:02.00  Cygnus A              ACIS-S NONE  30.00
 19:59:28.30  +40:44:02.00  Cygnus A              ACIS-S NONE 170.00

===================================================================================

Proposal Number: 06800929            
Proposal Title: Bubbles and B-Flats: A Deep Observation of Abell 2052

PI: Elizabeth Blanton              
Subject Category: CLUSTERS OF GALAXIES                              

Abstract: The cooling flow cluster Abell 2052 has, arguably, the morphology most
similar to the Perseus cluster as seen with Chandra images. Two clear bubbles to
the N and S of the center of Abell 2052 are filled with the radio lobes
associated with 3C 317. An unsharp-masked image reveals faint ripple features
similar to those seen in the Perseus cluster which may represent the propagation
of sound waves into the cluster from the radio source. We propose to observe
Abell 2052 much more deeply to study the ripple features, search for ghost
bubbles, search for cooling gas in the bright shells around the radio source that
may link the X-ray and H-alpha emission, detect hot gas within the X-ray holes,
and directly compare the star formation and cooling rates in the cluster center.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 15:16:44.50  +07:01:16.60  Abell 2052            ACIS-S NONE 130.00

===================================================================================

Proposal Number: 06800938            
Proposal Title: Chandra Observations of the DLS Shear-Selected Cluster Survey

PI: John Hughes                    
Subject Category: CLUSTERS OF GALAXIES                              

Abstract: We propose to continue our Chandra survey of the most massive clusters
currently identified from the Deep Lens Survey (DLS). The DLS is a deep
multicolor (BVRz') imaging survey of 28 square degrees being carried out at the
4-m telescopes of the US National Observatories. The DLS shear-selected cluster
sample makes it possible for the first time to study clusters in a
baryon-independent way. We are pursuing detailed investigations of this sample
with HST and ground-based Keck spectroscopy. Chandra observations will meet
multiple high-impact scientific goals, specifically, testing the fair sample
hypothesis, calibrating the relationships between cluster mass and X-ray
luminosity and temperature, and studying the evolution of these relationships
with look-back time.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 13:56:06.80  -10:51:16.00  DLS J1356-1051        ACIS-I NONE  20.00
 13:56:07.40  -11:40:32.00  DLS J1356-1140        ACIS-I NONE  20.00
 13:59:29.20  -10:55:45.00  DLS J1359-1055        ACIS-I NONE  20.00
 14:00:20.60  -11:54:37.80  DLS J1400-1154        ACIS-I NONE  20.00
 14:02:14.70  -10:50:45.00  DLS J1402-1052        ACIS-I NONE  20.00

===================================================================================

Proposal Number: 06800959            
Proposal Title: Intracluster Gas Velocity Tomography in RXJ0419.6+0225

PI: Renato Dupke                   
Subject Category: CLUSTERS OF GALAXIES                              

Abstract: A comprehensive search for ICM bulk motions in the ASCA archive
resulted in the discovery of significant ICM velocities of >2000 km/s in
RXJ0419.6+0225. Such high gas velocities have a profound impact on our our
understanding of formation and evolution of clusters and in determining cluster
physical characteristics such as ICM mass and energetics. Therefore, independent
confirmation and improved measurements of this discovery is very important. For
this study it is crucial that the instrumental gain be stable and that we know
its variations across the detectors. That makes Chandra the best satellite to
carry on this analysis. The observational strategy proposed here has been used
successfully before by the authors and allows us to eliminate the concern about
intrachip gain variation.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 04:19:32.00  +02:28:22.40  RXJ0419.6+0225(OFF1)  ACIS-S NONE  45.00
 04:19:43.40  +02:20:43.80  RXJ0419.6+0225(OFF2)  ACIS-S NONE  45.00

===================================================================================

Proposal Number: 06801032            
Proposal Title: X-ray emission from clusters of galaxies from the REFLEX sample.

PI: Peter Predehl                  
Subject Category: CLUSTERS OF GALAXIES                              

Abstract: We propose to observe in GTO time several clusters of galaxies from the
REFLEX sample.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 01:17:50.50  -54:55:25.70  RXCJ0117.8-5455       ACIS-S NONE  10.00
 04:00:01.40  -23:27:15.00  BMW040001.4-232715    ACIS-S NONE  10.00
 12:13:21.40  -26:17:51.00  RXCJ1213.3-2617       ACIS-S NONE  10.00

===================================================================================

Proposal Number: 06801077            
Proposal Title: Supplement to Chandra observations of high-redshift clusters of
galaxies from the 400 Square Degree ROSAT PSPC survey

PI: Stephen Murray                 
Subject Category: CLUSTERS OF GALAXIES                              


                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 05:22:13.80  -36:24:49.00  cl0522-3624           ACIS-I NONE  30.00
 09:26:36.60  +12:42:59.00  cl0926+1242           ACIS-I NONE  35.00
 11:17:30.10  +17:44:45.00  cl1117+1744           ACIS-I NONE  45.00
 13:54:16.70  -02:21:46.00  cl1354-0221           ACIS-I NONE  40.00


***********************************************************************************
EXTRAGALACTIC DIFFUSE EMISSION AND SURVEYS        
--------------------------------------------------

===================================================================================

Proposal Number: 06900144            
Proposal Title: Continuing X-Raying the Intergalactic Medium with Blazars in
Outburst: Deeper in Redshift and Wider in Area.

PI: Fabrizio Nicastro              
Subject Category: EXTRAGALACTIC DIFFUSE EMISSION AND SURVEYS        

Abstract: We propose to extend our highly succesful Chandra-AO4 and -AO5 TOO
programs to the 6th Chandra cycle, to observe up to 2 blazars in exceptionally
high states with the Chandra HRCS-LETG (hereinafter HLETG) for a total exposure
time of {\bf 340 ks} (2 orbits). We shall dramatically reduce the uncertainty on
the cosmological baryon mass density $\Omega_b$ in the local Universe studying
the ``warm'', low-redshift, phase of the intergalactic medium (WHIM), where most
of the baryonic matter of the $z \ls 1$ Universe is believed to hide.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
                            high-z blazar in out  HRC-S  LETG 170.00
                            moderate-z blazar in  HRC-S  LETG 170.00

===================================================================================

Proposal Number: 06900442            
Proposal Title: X-ray Emission from Optically-Selected, High-Redshift Galaxy
Clusters from the RCS Survey

PI: Gordon Garmire                 
Subject Category: EXTRAGALACTIC DIFFUSE EMISSION AND SURVEYS        

Abstract: We propose to continue our study of optically-selected, high-redshift
(z ~1) galaxy clusters from the RCS survey, which prior CXO observations have
shown to be relatively underluminous for their optical richness. We will observed
two clusters (one at z=1.09, for 70 ks, and one at z=0.64, for 50 ks) for a total
exposure of 120 ksec. Our aim is to determine luminosity and bound the global
temperature of these objects, to progress toward completion of X-ray observations
of a well-defined z=1 subsample of the RCS, and to help select RCS candidates for
subsequent, very deep followup observations with Chandra and XMM.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 21:12:18.00  -63:25:60.00  RCS2112.3-6326        ACIS-S NONE  70.00

===================================================================================

Proposal Number: 06900444            
Proposal Title: Deep Chandra Imaging of the Extended Groth Strip: The
Co-evolution of Black Holes and Galaxies

PI: Kirpal Nandra                  
Subject Category: EXTRAGALACTIC DIFFUSE EMISSION AND SURVEYS        

Abstract: The Extended Groth Strip (EGS) is a half square degree region that has
been targeted intensively for galaxy evolution studies. A remarkable array of
ultra-deep data have been or will be accumulated, to include radio, near/mid/far
IR, optical and UV data of depth comparable to or better than any part of the
sky. It is also the subject of the massive DEEP2 redshift survey, giving high
quality Keck spectra for 16-17,000 galaxies. The clear gap in the coverage of the
EGS is in the X-ray, and we therefore propose to augment the single deep Chandra
pointing with 7 more, to image the whole strip. Our goal is to study the
co-evolution of galaxies and black holes, by examining in detail the astrophysics
of AGN activity, and its relationship to the host galaxy and surrounding large
scale structure.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 14:15:47.50  +52:08:21.40  EGS-7                 ACIS-I NONE  30.00
 14:15:47.50  +52:08:21.40  EGS-7                 ACIS-I NONE 170.00
 14:16:49.50  +52:19:57.60  EGS-6                 ACIS-I NONE  30.00
 14:16:49.50  +52:19:57.60  EGS-6                 ACIS-I NONE 170.00
 14:18:32.90  +52:38:56.90  EGS-5                 ACIS-I NONE  30.00
 14:18:32.90  +52:38:56.90  EGS-5                 ACIS-I NONE 170.00
 14:19:36.40  +52:50:27.70  EGS-4                 ACIS-I NONE  30.00
 14:19:36.40  +52:50:27.70  EGS-4                 ACIS-I NONE 170.00
 14:20:40.50  +53:01:56.30  EGS-3                 ACIS-I NONE  30.00
 14:20:40.50  +53:01:56.30  EGS-3                 ACIS-I NONE 170.00
 14:21:45.20  +53:13:22.70  EGS-2                 ACIS-I NONE  30.00
 14:21:45.20  +53:13:22.70  EGS-2                 ACIS-I NONE 170.00
 14:22:54.80  +53:25:32.50  EGS-1                 ACIS-I NONE  30.00
 14:22:54.80  +53:25:32.50  EGS-1                 ACIS-I NONE 170.00

===================================================================================

Proposal Number: 06900602            
Proposal Title: The Spectral Energy Distributions of AGN: A Shallow Survey of
the ELAIS-N1 Field

PI: Kirpal Nandra                  
Subject Category: EXTRAGALACTIC DIFFUSE EMISSION AND SURVEYS        

Abstract: We propose a shallow survey of 1 sq. degree in the ELAIS-N1 field. This
is the first to be observed as part of the SWIRE Spitzer legacy program, for
which the data are now in hand. Our goal is to use the broad, multiband data from
SWIRE and other supporting observations to construct the radio-to-X-ray SEDs of
X-ray selected AGN. The SEDs reflect the balance of power between the accretion
processes, the optical depth and covering fraction of any obscuring gas and dust,
and the star formation rate. The relatively bright flux limit of our survey makes
for almost 100% completeness in the optical and infrared. The resulting large
sample (~400) will therefore be an invaluable resource to test models of
obscuration and unification, the starburst-AGN connection, and the role of radio
power.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 16:06:15.40  +54:21:22.30  N1_01                 ACIS-I NONE   5.00
 16:06:15.40  +54:33:22.30  N1_02                 ACIS-I NONE   5.00
 16:06:15.40  +54:45:22.30  N1_03                 ACIS-I NONE   5.00
 16:07:37.40  +54:09:22.30  N1_04                 ACIS-I NONE   5.00
 16:07:37.70  +54:21:22.30  N1_05                 ACIS-I NONE   5.00
 16:07:38.10  +54:33:22.30  N1_06                 ACIS-I NONE   5.00
 16:07:38.50  +54:45:22.30  N1_07                 ACIS-I NONE   5.00
 16:07:39.00  +54:57:22.30  N1_08                 ACIS-I NONE   5.00
 16:08:58.50  +53:57:22.30  N1_09                 ACIS-I NONE   5.00
 16:08:59.30  +54:09:22.30  N1_10                 ACIS-I NONE   5.00
 16:09:00.10  +54:21:22.30  N1_11                 ACIS-I NONE   5.00
 16:09:00.90  +54:33:22.30  N1_12                 ACIS-I NONE   5.00
 16:09:01.70  +54:45:22.30  N1_13                 ACIS-I NONE   5.00
 16:09:02.60  +54:57:22.30  N1_14                 ACIS-I NONE   5.00
 16:10:20.10  +53:57:22.30  N1_15                 ACIS-I NONE   5.00
 16:10:21.30  +54:09:22.30  N1_16                 ACIS-I NONE   5.00
 16:10:22.50  +54:21:22.30  N1_17                 ACIS-I NONE   5.00
 16:10:24.90  +54:45:22.30  N1_18                 ACIS-I NONE   5.00
 16:10:26.20  +54:57:22.30  N1_19                 ACIS-I NONE   5.00
 16:10:29.90  +55:07:49.20  N1_20                 ACIS-I NONE   5.00
 16:11:41.70  +53:57:22.30  N1_21                 ACIS-I NONE   5.00
 16:11:43.30  +54:09:22.30  N1_22                 ACIS-I NONE   5.00
 16:11:44.90  +54:21:22.30  N1_23                 ACIS-I NONE   5.00
 16:11:46.50  +54:33:22.30  N1_24                 ACIS-I NONE   5.00
 16:11:48.10  +54:45:22.30  N1_25                 ACIS-I NONE   5.00
 16:11:49.80  +54:57:22.30  N1_26                 ACIS-I NONE   5.00
 16:13:05.20  +54:09:22.30  N1_27                 ACIS-I NONE   5.00
 16:13:07.20  +54:21:22.30  N1_28                 ACIS-I NONE   5.00
 16:13:09.20  +54:33:22.30  N1_29                 ACIS-I NONE   5.00
 16:13:11.30  +54:45:22.30  N1_30                 ACIS-I NONE   5.00

===================================================================================

Proposal Number: 06901058            
Proposal Title: X-ray Emission from Optically-Selected, High-Redshift Galaxy
Clusters from the RCS Survey

PI: Gordon Garmire                 
Subject Category: EXTRAGALACTIC DIFFUSE EMISSION AND SURVEYS        

Abstract: We propose to continue our study of optically-selected, high-redshift
(z ~1) galaxy clusters from the RCS survey, which prior CXO observations have
shown to be relatively underluminous for their optical richness. Here we propose
a 50ks followup observation of RCS1419+5326 (z=0.64), initially observed for 10ks
in GO3. The proposed observation will provide a precise global temperature for
this object, as well as surface brightness and temperature maps that can diagnose
the dynamical state of the cluster.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 11:07:18.00  -05:22:60.00  RCS1107.3-0523        ACIS-S NONE  50.00
 14:19:12.10  +53:26:11.00  RCS1419+5326          ACIS-S NONE  50.00


***********************************************************************************
GALACTIC DIFFUSE EMISSION AND SURVEYS             
--------------------------------------------------

===================================================================================

Proposal Number: 06910030            
Proposal Title: Measuring X-ray Absorption Fine Structures of Interstellar
Grains

PI: Claude Canizares               
Subject Category: GALACTIC DIFFUSE EMISSION AND SURVEYS             

Abstract: We propose to study compositions and structures of interstellar matter
using HETGS observations of the X-ray binary GX 5-1. We intend to obtain a highly
resolved X-ray spectrum primarily around the Si K edge region. We will determine
the structure of the Si edge abd identify X-ray Absorption Fine Structure (XAFS).
Fitting the structure with recent laboratory data allows us to determine the
amount of SiO2 likely bound into grains relative to absorption of atomic Si. The
observations may allow us to identify XAFSs signatures from other molecular
compounds. We will similarily investigate possible structures in the Mg K and S K
edges as well.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 18:01:08.20  -25:04:45.00  GX 5-1                ACIS-S HETG  50.00

===================================================================================

Proposal Number: 06910168            
Proposal Title: Massive Star Life, Death, and Rebirth in the Perseus Arm

PI: Leisa Townsley                 
Subject Category: GALACTIC DIFFUSE EMISSION AND SURVEYS             

Abstract: This joint Chandra/XMM mosaic of W4/W3/HB3 allows us to chronicle the
X-ray output of the entire life cycle of high-mass stars, from their intrinsic
and wind-collision emission, through their SN phase, and back to the embedded,
protostellar X-rays heralding the next generation of massive star formation. In
addition we see the feedback of these massive stars on the interstellar medium in
the Perseus Arm: the stellar winds from a massive young cluster (IC 1805) have
blown the W4 superbubble and chimney; perhaps an older superbubble is over 100
times brighter in X-rays due to supernovae in its interior (HB3), and the
expansion of these bubbles is compressing the W3 molecular cloud and triggering a
new generation of stars to form.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 02:25:40.60  +62:05:52.40  W3 Main IRS5          ACIS-I NONE  40.00
 02:26:50.80  +62:15:52.00  W3 North              ACIS-I NONE  80.00
 02:27:04.10  +61:52:22.00  W3(OH)                ACIS-I NONE  80.00

===================================================================================

Proposal Number: 06910296            
Proposal Title: Filling in the X-ray Halo around GX13+1

PI: Randall Smith                  
Subject Category: GALACTIC DIFFUSE EMISSION AND SURVEYS             

Abstract: GX13+1 is a bright, highly-absorbed LMXB with a strong X-ray halo.
Prior Chandra data showed the dust towards GX13+1 is neither huge nor ``fluffy,''
as had been suggested, but pileup in the ACIS CCDs means that Chandra's full
angular resolution could not be used. We propose a short HRC-I observation to
fill in the inner 50'', which in combination with earlier observations will
determine if the data agree with modern dust models such as the Weingartner \&
Draine (2001) model or prefer the 1977 Mathis, Rumpl \& Nordsieck model. This
observation will also be sensitive to clouds near the source which might explain
the apparent discrepancy between the low column densities measured towards GX13+1
from the X-ray halo and the higher results found from the X-ray spectrum.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 18:14:31.60  -17:09:26.70  GX13+1                HRC-I  NONE   9.00

===================================================================================

Proposal Number: 06910473            
Proposal Title: Sgr C: A New X-Ray Reflection Nebula?

PI: Hiroshi Murakami               
Subject Category: GALACTIC DIFFUSE EMISSION AND SURVEYS             

Abstract: We propose an ACIS-I observation on a giant molecular cloud Sgr C,
located -0.5 degree from the Galactic center (GC). We will establish a new class
of X-ray sources, X-ray Reflection Nebula (XRN), following the first discovery of
this class, the Sgr B2 cloud, located at +0.6 degree from the GC. Using the XRN
concept of both Sgr B2 and Sgr C, we search for an irradiating source and
investigate the past activity near the GC region. We then determine the chemical
composition and mass of Sgr C, and investigate the GC environments. Also we
search for high mass formation activity or X-ray emitting young stellar objects,
in the giant molecular cloud Sgr C.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 17:44:36.50  -29:27:56.00  Sgr C                 ACIS-I NONE  90.00

===================================================================================

Proposal Number: 06910723            
Proposal Title: ACIS-I Reveals a 60 Mega Kelvin Cocoon Surrounding a Galactic
Star Burst Monster

PI: Masahiro Tsujimoto             
Subject Category: GALACTIC DIFFUSE EMISSION AND SURVEYS             

Abstract: We propose an ACIS-I imaging-spectroscopy observation of W49A, one of
the most luminous and youngest giant HII region in our Galaxy. The aim of this
observation is to establish the hard X-ray diffuse emission from giant HII
regions and to discuss the cause and affect of the enigmatic phenomenon. A part
of W49A was coincidently covered by ACIS-S at its edge, indicating the existence
of T~60 MK plasma in W49A. Our observation will identify the diffuse nature of
this emission and determine the morphology and plasma parameters with an improved
PSF radius. The contribution of diffuse emission from HII regions to the Galactic
diffuse X-ray emission is going to be discussed based on this data.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 19:10:21.90  +09:05:04.00  W49A                  ACIS-I NONE 100.00

The Chandra X-Ray Center (CXC) is operated for NASA by the Smithsonian Astrophysical Observatory. 60 Garden Street, Cambridge, MA 02138 USA. Email: cxchelp@head.cfa.harvard.edu Smithsonian Institution, Copyright © 1998-2024. All rights reserved.

Chandra Cycle 6 Science Programs

Projects are grouped into the following categories.