Chandra X-Ray Observatory (CXC)

Accepted Cycle 12 Large / Very Large Proposals

Proposal NumberSubject CategoryPI NameTypeTime
(Ks)		Title
12200128STARS AND WDTownsleyLP460A Long Look at NGC 3603, the Milky Way's Starburst Cluster
12200492STARS AND WDKashyapLP240SPINNING CORONA OF FK COM
12200640STARS AND WDKastnerLP570X-rays from Planetary Nebulae: Unveiling Binarity, Magnetic Fields, and Wind Collisions
12300901WD BINARIES AND CVSokoloskiLP250X-RAY IMAGING OF NOVA SHELLS
12400372BH AND NS BINARIESGallowayTOO/LP150Photospheric radius-expansion bursts at high spectral resolution
12400926BH AND NS BINARIESTomsickLP540Census of the Normal Spiral Arm Region
12500138SN, SNR AND ISOLATED NSRomaniLP160A Survey of PWNe around Narrow-Pulse Gamma-ray Pulsars
12500822SN, SNR AND ISOLATED NSBorkowskiVLP1000Radioactivity, Particle Acceleration, and Supernova Ejecta in the Youngest Galactic SNR G1.9+0.3
12610312NORMAL GALAXIES: DIFFUSE EMISSIONRandallLP500Understanding AGN Feedback with Deep Observations of NGC 5813
12620596NORMAL GALAXIES: X-RAY POPULATIONSLongLP750REMNANTS, BINARIES, AND DIFFUSE EMISSION IN THE NEARBY GRAND DESIGN SPIRAL M83
12700679ACTIVE GALAXIES AND QUASARSReevesLP400A Definitive Observation of an Accretion Disk Wind in the Quasar MR 2251-178
12700932ACTIVE GALAXIES AND QUASARSEvansLP300THE FIRST SPATIALLY RESOLVED SPECTRUM OF AN AGN OUTFLOW IN AN EARLY-TYPE GALAXY: A DEEP HETG OBSERVATION OF MRK 3
12800339CLUSTERS OF GALAXIESRussellLP400Revealing the ICM transport processes with the bow shock, upstream shock and turbulent wake in Abell 2146
12800433CLUSTERS OF GALAXIESKraftLP300A Deep {\em Chandra} Study of NGC 4472 - Gas Dynamics in the Nearest Group-Cluster Merger
12800632CLUSTERS OF GALAXIESHughesLP477Chandra Observations of the ACT Sample of SZE-Selected Galaxy Clusters
12900343EXTRAGALACTIC DIFFUSE EMISSION AND SURVEYSNicastroLP500Securing a Detection of the Bulk of the Missing Baryons
12900635EXTRAGALACTIC DIFFUSE EMISSION AND SURVEYSWangLP335A CHandra survey of Extended Emission-line Regions in nearby Seyfert galaxies (CHEERS)
12910240GALACTIC DIFFUSE EMISSION AND SURVEYSStockeLP300Detecting the Hot Wind Escaping from the Galactic Center of the Milky Way
Subject Category: STARS AND WD

Proposal Number: 12200128

Title: A Long Look at NGC 3603, the Milky Way's Starburst Cluster

PI Name: Leisa Townsley

NGC 3603 is one of the youngest truly massive stellar clusters in the Galaxy and serves as a springboard for understanding super star clusters such as R136 in 30 Doradus. Recent advances in infrared imaging and UV/visual spectroscopy applied to NGC 3603 are yielding new catalogs of pre-Main Sequence stars and new spectral types for massive stars; advances in ACIS analysis techniques now give robust X-ray source properties in crowded fields that facilitate comparison with these new datasets. We will apply these new methods to a deep ACIS-I observation of NGC 3603 to study its massive stars (3 W-R + >100 O stars, including over half of the Galaxy's O3 stars), thousands of pre-main sequence stars, and diffuse X-ray emission that pervades the cluster, perhaps indicating cavity supernovae.

R.A. Dec. Target Name Det. Grating Exp.Time
11:15:07.20-61:15:35.20NGC 3603ACIS-INONE460
Subject Category: STARS AND WD

Proposal Number: 12200492

Title: SPINNING CORONA OF FK COM

PI Name: Vinay Kashyap

FK Com (GIII) is an ultra-fast rotator - a coalesced binary that has spun up - and provides unique insights into activity at the extremes of dynamo action. Two consecutive Chandra orbits of ACIS-S/HETG and 20 orbits of HST/COS observations will be combined with contemporaneous Doppler imaging maps and spectropolarimetric field measurements to build 3D coronal models. We will: locate dominant coronal and TR structures using Doppler shifts; measure emission scale heights via rotational broadening; derive densities, abundances, and EM in both quiescent and flaring plasma; constrain the dynamic processes by line profile modeling; and measure microflaring effects. Results of this LP will provide a detailed legacy view of the workings of coronae at their extreme edge.

R.A. Dec. Target Name Det. Grating Exp.Time
13:30:46.80+24:13:57.70FK ComACIS-SHETG240
Subject Category: STARS AND WD

Proposal Number: 12200640

Title: X-rays from Planetary Nebulae: Unveiling Binarity, Magnetic Fields, and Wind Collisions

PI Name: Joel Kastner

Chandra has yielded unparalleled insight into the processes involved in shaping planetary nebulae (PNe), via the detection of diffuse and/or point-like X-ray sources within PNe. Diffuse X-ray sources, whether due to ``hot bubbles'' or to collimated outflows or jets, allow us to probe the energetic shocks within PN wind interaction regions. Meanwhile, X-ray point sources in PNe provide unique diagnostics of circumstellar magnetic fields, accretion disks, wind shocks, and/or binary companions at PN cores. These results from Chandra's first decade have prompted the community of PN astronomers to propose the first systematic X-ray survey of PNe in the solar neighborhood.

R.A. Dec. Target Name Det. Grating Exp.Time
04:09:17.00+30:46:33.50NGC 1514ACIS-SNONE20
03:33:14.60-25:52:18.00NGC 1360ACIS-SNONE20
19:59:36.30+22:43:16.10NGC 6853ACIS-SNONE20
18:53:35.10+33:01:45.00NGC 6720ACIS-SNONE20
21:00:32.50+54:32:36.20NGC 7008ACIS-SNONE20
11:14:47.70+55:01:08.50NGC 3587ACIS-SNONE20
17:35:41.90-40:11:26.50PN Lo 16ACIS-SNONE30
19:18:28.10+06:32:19.30NGC 6781ACIS-SNONE30
09:39:09.10-02:48:32.00A66 33ACIS-SNONE30
17:13:44.20-37:06:15.90NGC 6302ACIS-SNONE30
01:42:19.90+51:34:31.10M 76ACIS-SNONE30
19:14:36.40-02:42:25.00NGC 6772ACIS-SNONE30
23:25:53.60+42:32:06.00NGC 7662ACIS-SNONE30
21:36:53.00+12:47:19.00NGC 7094ACIS-SNONE30
17:49:15.20-20:00:34.50NGC 6445ACIS-SNONE30
07:25:34.70+29:29:26.40NGC 2371ACIS-SNONE30
07:41:50.50-14:44:07.70NGC 2438ACIS-SNONE30
19:31:35.10+09:13:31.40NGC 6804ACIS-SNONE30
07:09:22.50-00:48:23.60NGC 2346ACIS-SNONE30
10:24:46.10-18:38:32.60NGC 3242ACIS-SNONE30
21:04:10.90-11:21:48.30NGC 7009ACIS-SNONE30
Subject Category: WD BINARIES AND CV

Proposal Number: 12300901

Title: X-RAY IMAGING OF NOVA SHELLS

PI Name: Jennifer Sokoloski

Novae are the most common stellar explosions in the Universe, and the most energetic after GRBs and supernovae. Like other stellar explosions, optical data show that novae are aspherical and inhomogeneous. Although novae are known to be triggered by a thermonuclear runaway (TNR) on an accreting white dwarf, the means by which the observed structure is produced is less clear. Since the shaping of nova remnants must produce shocks, and thus X-rays, Chandra imaging provides a powerful tool for understanding how novae produce their rings, clumps, and jets. We propose a major comparative study of the X-rays from nova shells to determine the processes that shape the ejecta. This work has wider implications for the physics of jets and asymmetry production in all types of stellar explosions.

R.A. Dec. Target Name Det. Grating Exp.Time
17:50:13.20-06:42:28.40RS OphACIS-SNONE250
Subject Category: BH AND NS BINARIES

Proposal Number: 12400372

Title: Photospheric radius-expansion bursts at high spectral resolution

PI Name: Duncan Galloway

It has been predicted that strong (a few hundred eV EW) photoionisation edges might be present in the X-ray spectra at the peak of photospheric radius-expansion thermonuclear bursts, and these predictions have been corroborated recently in low-resolution RXTE spectra. We propose to search for such features in bursts from sources known for frequent radius-expansion bursts. This resubmission of an untriggered AO-10 proposal will result in detection of up to 30 bursts, also allowing detailed comparisons of recurrence time and energetics with numerical ignition models, as well as a high signal-to-noise persistent spectrum. Detection of discrete features from the burst spectra may lead to constraints on the compactness and hence the neutron-star equation of state.

R.A. Dec. Target Name Det. Grating Exp.Time
17:38:58.30-44:27:00.004U 1735-44ACIS-SHETG150
Subject Category: BH AND NS BINARIES

Proposal Number: 12400926

Title: Census of the Normal Spiral Arm Region

PI Name: John Tomsick

Despite having only moderate hard X-ray sensitivity, the INTErnational Gamma-Ray Astrophysics Laboratory (INTEGRAL) has greatly expanded our knowledge of High-Mass X-ray Binaries (HMXBs) by finding large numbers and new types of HMXBs. There are good reasons to think that even fainter HMXBs should be present, and we propose to use Chandra to survey part of the Norma region, which is the location with the highest density of HMXBs. This will be important for understanding the HMXB population and its evolution, the HMXB luminosity function and how faint wind-accrting HMXBs can be, as well as providing critical estimates for Advanced-LIGO source rates. IR follow-up is proposed, and the subarcsecond Chandra positions are critical.

R.A. Dec. Target Name Det. Grating Exp.Time
16:37:27.30-47:07:36.80Norma RegionACIS-INONE540
Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 12500138

Title: A Survey of PWNe around Narrow-Pulse Gamma-ray Pulsars

PI Name: Roger Romani

We propose here, on behalf of the Fermi LAT team, ACIS observations of the X-ray counterparts of six unusual gamma-ray pulsars discovered by the LAT. The targets, four seen only in the gamma-rays, two also radio-detected, have unusual single or narrow double pulse profiles, which require particular emission geometries for different pulsar models. By measuring the arcsecond-scale structure of the wind nebula termination shocks of these young (<100kyr) objects, CXO can pin down the viewing angle and test the pulsar physics. All have known X-ray fluxes and we can also extract spectral and distance estimates needed to interpret the GeV gamma-rays. The survey sample covers a range of ages, spindown powers and expected inclinations, making it a powerful test of pulsar emission models.

R.A. Dec. Target Name Det. Grating Exp.Time
14:20:08.20-60:48:16.60J1420-6048ACIS-INONE90
18:09:50.20-23:32:22.90J1809-2332ACIS-INONE30
17:18:13.60-38:25:18.10J1718-3825ACIS-SNONE40
Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 12500822

Title: Radioactivity, Particle Acceleration, and Supernova Ejecta in the Youngest Galactic SNR G1.9+0.3

PI Name: Kazimierz Borkowski

X-rays in G1.9+0.3 are produced primarily by energetic electrons accelerated in its very fast blast wave. However, the radio-bright but X-ray faint northern shell shows prominent thermal emission from supernova ejecta. Doppler broadening velocities are of order 26,000 km/s. An additional spectral line at 4.1 keV is emitted by radioactive 44Sc produced by the electron-capture decay of 44Ti. The line flux implies an initial mass of 44Ti synthesized in the explosion of 1.9 x 10-5 solar masses. The spatial distribution of 44Sc hints at an asymmetric explosion. We propose a 1 Ms Chandra observation, with the primary goal of mapping 44Sc emission. This observation will establish the degree of asymmetry of the explosion, and may distinguish between core-collapse and Type Ia origin for G1.9+0.3.

R.A. Dec. Target Name Det. Grating Exp.Time
17:48:45.00-27:10:00.10G1.9+0.3ACIS-SNONE1000
Subject Category: NORMAL GALAXIES: DIFFUSE EMISSION

Proposal Number: 12610312

Title: Understanding AGN Feedback with Deep Observations of NGC 5813

PI Name: Scott Randall

NGC 5813 shows X-ray cavities and shocks from multiple AGN outbursts in an otherwise dynamically relaxed system. We propose a deep 500 ks observation of NGC 5813 to 1) measure the temperature structure across the inner shock to directly measure AGN feedback heating and compare with the outer shock, 2) better characterize the structure of the outermost cavities to study the evolution of the buoyantly rising bubbles, 3) better resolve the temperature and, in particular, abundance structure in the gas to measure its displacement due to AGN feedback, and 4) search for cavities from even older outbursts, beyond the currently detected outermost cavities. Joint observations with the VLA will allow a further exploration of the evolution of the radio properties of the buoyantly rising cavities.

R.A. Dec. Target Name Det. Grating Exp.Time
15:01:06.80+01:40:44.70NGC5813ACIS-SNONE500
Subject Category: NORMAL GALAXIES: X-RAY POPULATIONS

Proposal Number: 12620596

Title: REMNANTS, BINARIES, AND DIFFUSE EMISSION IN THE NEARBY GRAND DESIGN SPIRAL M83

PI Name: Knox Long

M83 is a nearby face-on grand-design spiral. With a high supernova rate, a starburst nucleus, and large numbers of high mass star clusters in the disk of the galaxy, it is a superb laboratory for understanding how the life cycle of stars and the interstellar medium interact to produce X-ray emission in normal galaxies. Here we propose a deep ACIS-S observation of M83. In addition to detailed spectral and temporal studies of the brightest 50 sources, we will relate the X-ray properties of the SNRs, XRBs, and diffuse X-ray emission to the local environment, using the underlying stellar population and/or distance from features like the spiral arms to constrain the progenitors of the sources, to test population models, and to explore the physical mechanisms responsible for diffuse emission.

R.A. Dec. Target Name Det. Grating Exp.Time
13:37:00.80-29:51:58.60M83ACIS-SNONE750
Subject Category: ACTIVE GALAXIES AND QUASARS

Proposal Number: 12700679

Title: A Definitive Observation of an Accretion Disk Wind in the Quasar MR 2251-178

PI Name: James Reeves

The bright, nearby QSO MR 2251-178 was the first AGN where a warm absorber was detected. Subsequent observations have shown there are at least two outflowing components; a low ionization soft X-ray absorber and a fast (0.07c), high ionization wind. We propose a deep (400 ks) Chandra HETG observation of MR 2251-178 in order to unequivocally determine the origin of the outflow at the highest possible spectral resolution. Our goals are; (i) establish the nature of the high ionization outflow, e.g. as part of a disk wind, through unprecedented high S/N observations in the Fe/Si K band, (ii) determine the properties of the soft X-ray absorber through high resolution spectroscopy and (iii) establish the connection between the UV and X-ray absorbers with a simultaneous HST snapshot.

R.A. Dec. Target Name Det. Grating Exp.Time
22:54:05.80-17:34:55.00MR 2251-178ACIS-SHETG400
Subject Category: ACTIVE GALAXIES AND QUASARS

Proposal Number: 12700932

Title: THE FIRST SPATIALLY RESOLVED SPECTRUM OF AN AGN OUTFLOW IN AN EARLY-TYPE GALAXY: A DEEP HETG OBSERVATION OF MRK 3

PI Name: Daniel Evans

We propose a 300-ks HETG observation of the resolved, kpc-scale AGN outflow that forms the photoionized NLR in the prototypical early-type galaxy Markarian 3. We will use Chandra's superb spatial and spectral resolution to extract, compare, and model spectra at four off-nuclear points along the NLR and ENLR. By performing a detailed modeling of the emission-line spectra, we will determine (1) the spatial extent of the outflow, (2) its velocity structure, and (3) the mass and energy rates imparted by the outflow into its environment. Our results will provide the first X-ray test of whether outflows in such early-type galaxies expel, as expected, significant quantities of material during their hosts' transition from the blue cloud to the red sequence.

R.A. Dec. Target Name Det. Grating Exp.Time
06:15:36.30+71:02:15.00Markarian 3ACIS-SHETG300
Subject Category: CLUSTERS OF GALAXIES

Proposal Number: 12800339

Title: Revealing the ICM transport processes with the bow shock, upstream shock and turbulent wake in Abell 2146

PI Name: Helen Russell

Shock fronts generated by galaxy cluster mergers provide a key tool for studying the cluster gas. However, unambiguous detections of shock fronts are rare and only two have previously been found, those in the Bullet cluster and Abell 520. Our recent Chandra observation of Abell 2146 has revealed that this cluster has two Mach 2 merger shock fronts and a gas structure remarkably similar to the Bullet cluster (eg. Markevitch et al. 2002). We propose a deep observation of Abell 2146 to test electron-ion equilibrium, which was found to be shorter than the Coulomb time in the Bullet cluster, and investigate the ICM transport processes by studying the complex substructures and shocks in the subcluster tail.

R.A. Dec. Target Name Det. Grating Exp.Time
15:56:14.70+66:20:48.90Abell 2146ACIS-INONE400
Subject Category: CLUSTERS OF GALAXIES

Proposal Number: 12800433

Title: A Deep {\em Chandra} Study of NGC 4472 - Gas Dynamics in the Nearest Group-Cluster Merger

PI Name: Ralph Kraft

We propose a deep, 300 ks, Chandra/ACIS-S observation of the nearby galaxy NGC 4472. NGC 4472 is the most optically luminous galaxy of the Virgo cluster, and is the dominant member of a group falling into M87. It is the nearest, brightest example of a group being ram-pressure stripped as it falls into a cluster, and this deep observation will elucidate microphysics of the stripping process unobservable in any other object. We will measure temperature and elemental abundance variations of 4% and 15% (90% confidence), respectively, on scales as small as 250pcx250pc. We will also make a deep study of the LMXB population, and probe the dynamics of the gas flow near the Bondi radius of the central SMBH.

R.A. Dec. Target Name Det. Grating Exp.Time
12:29:46.70+08:00:02.00NGC 4472ACIS-SNONE300
Subject Category: CLUSTERS OF GALAXIES

Proposal Number: 12800632

Title: Chandra Observations of the ACT Sample of SZE-Selected Galaxy Clusters

PI Name: John Hughes

We propose to obtain Chandra observations of a complete sample of galaxy clusters detected by the Atacama Cosmology Telescope (ACT) using the Sunyaev-Zeldovich effect (SZE). The proposed ACIS-I observations of 14 massive, newly-discovered SZE clusters will provide a precision calibration of the SZE signal versus mass correlation out to redshifts of 1. This effort is part of an intensive multi-wavelength campaign to produce an unbiased, well-observed sample of massive galaxy clusters out to high redshifts for cosmological investigations. These proposed observations will allow us to link directly the X-ray and SZE properties of massive clusters, so that cosmologists can reliably utilize the new large cluster samples that are being accumulated from both Chandra and the new SZ experiments.

R.A. Dec. Target Name Det. Grating Exp.Time
01:02:53.00-49:15:16.90ACT J0102-4915ACIS-INONE60
04:38:21.00-54:19:48.10ACT J0438-5419ACIS-INONE20
02:45:28.50-53:02:05.00ACT J0245-5302ACIS-INONE20
06:16:37.30-52:27:37.10ACT J0616-5227ACIS-INONE39
02:35:50.70-51:21:55.40ACT J0235-5121ACIS-INONE20
02:32:50.30-52:57:50.00ACT J0232-5257ACIS-INONE20
05:59:46.00-52:50:21.40ACT J0559-5249ACIS-INONE115
03:04:19.10-49:21:53.50ACT J0304-4921ACIS-INONE23
02:37:04.70-49:38:39.30ACT J0237-4939ACIS-INONE42
06:41:37.80-49:46:54.70ACT J0641-4948ACIS-INONE20
02:15:15.10-52:12:53.90ACT J0215-5212ACIS-INONE21
02:17:10.70-52:44:32.00ACT J0217-5245ACIS-INONE20
03:46:58.60-54:39:31.00ACT J0346-5438ACIS-INONE37
07:07:08.00-55:23:37.00ACT J0707-5522ACIS-INONE20
Subject Category: EXTRAGALACTIC DIFFUSE EMISSION AND SURVEYS

Proposal Number: 12900343

Title: Securing a Detection of the Bulk of the Missing Baryons

PI Name: Fabrizio Nicastro

We propose to optimize the use of X-ray and FUV observatories to settle unambiguously one of the most controversial and open problems of modern astrophysics: the existence of the Missing Baryons in a Warm-Hot Intergalactic Medium (WHIM). We will do this by targeting a 500 ks Chandra-LETG observation on the best available tracers of the bulk (~80%) of the Missing Baryons in the Universe: two intergalactic absorption systems recently detected through Broad HI Lya and triple-OVI absorption, respectively, in a moderate S/N HST-COS spectrum of the bright and relatively high-redshift (z>0.4) blazar 1ES 1553+113. The proposed observation is carefully designed to finally secure a detection of the WHIM and to obtain a first robust estimate of its metal content.

R.A. Dec. Target Name Det. Grating Exp.Time
15:55:43.00+11:11:24.001ES 1553+113HRC-SLETG500
Subject Category: EXTRAGALACTIC DIFFUSE EMISSION AND SURVEYS

Proposal Number: 12900635

Title: A CHandra survey of Extended Emission-line Regions in nearby Seyfert galaxies (CHEERS)

PI Name: Junfeng Wang

We propose the `ultimate' resolution Chandra imaging survey (CHEERS) of a far-IR selected sample of active galactic nuclei (AGN) from Schmitt et al. (2003). With complementary high resolution HST and radio data, CHEERS will (1) resolve the detailed X-ray morphology of the extended narrow line region and obtain full picture of the multiphase interstellar medium (ISM) with typical resolution of 0.4 arcsec; (2) investigate the X-ray emission mechanisms at AGN jet-ISM interaction regions and (3) measure mass and momentum outflow rates to evaluate the importance of AGN feedback. To achieve these goals, we request 335 ks ACIS-S observations and 5 HST orbits to supplement the archival data.

R.A. Dec. Target Name Det. Grating Exp.Time
03:36:46.20-35:59:57.30NGC 1386ACIS-SNONE80
10:48:23.50-25:09:43.40NGC 3393ACIS-SNONE70
12:25:46.80+12:39:43.80NGC 4388ACIS-SNONE30
12:35:36.60-39:54:33.40NGC 4507ACIS-SNONE45
06:15:36.40+71:02:15.10Mrk 3ACIS-SNONE30
01:43:57.80+02:21:00.00Mrk 573ACIS-SNONE80
Subject Category: GALACTIC DIFFUSE EMISSION AND SURVEYS

Proposal Number: 12910240

Title: Detecting the Hot Wind Escaping from the Galactic Center of the Milky Way

PI Name: John Stocke

We propose a 300 ksec ACIS + LETG exposure to detect and study our own Galaxy's outflowing nuclear wind. We have used HST and FUSE to discover the absorption signature of this wind in intermediate (e.g. C III) and high (e.g. O VI) ions towards two extragalactic targets above and below the Galactic Center. One of these targets (PKS 2005-489) is bright enough to observe at low resolution with Chandra to address two important questions about this wind: (1) Does any portion of this wind (e.g., O VII & O VIII ions) escape the Galaxy? The C III & O VI ions do not have escape speed; and (2) What is the ionization state and thus the metallicity of the gas? The mass flux, dynamics, and metallicity of this wind will give us valuable insight into the star formation history of the Milky Way.

R.A. Dec. Target Name Det. Grating Exp.Time
20:09:25.40-48:49:51.60PKS 2005-489ACIS-SLETG300
Smithsonian Institute Smithsonian Institute

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.