Accepted Cycle 2 Large Project Proposals

Proposal Number	Subject Category	PI Name	Type	Time (Ks)	Title
02200644	NORMAL STARS AND WD	Ayres	LP	380	TORTURED CORONAE IN THE RAPID BRAKING ZONE
02500880	SN, SNR AND ISOLATED NS	HESTER	LP	200	COORDINATED CHANDRA/HST OBSERVATIONS OF THE CRAB NEBULA
02600758	NORMAL GALAXIES	Prestwich	LP	547	THE X-RAY POINT SOURCE POPULATION IN SPIRAL GALAXIES
02700294	ACTIVE GALAXIES AND QUASARS	George	LP	850	DETERMINING THE NATURE OF THE VARIABLE ABSORPTION IN NGC 3783 WITH CHANDRA/HST
02700728	ACTIVE GALAXIES AND QUASARS	Mathur	LP	500	FINDING THE BARYONS IN THE LOW REDSHIFT UNIVERSE.
02800845	CLUSTERS OF GALAXIES	Stanford	LP	375	A COMPLETE X-RAY CLUSTER SAMPLE AT Z > 0.8
02900196	EXTRAGALACTIC DIFFUSE EMISSION AND SURVEYS	Brandt	LP	495	THE CHANDRA DEEP SURVEY OF THE HUBBLE DEEP FIELD NORTH (HDF-N) AREA
02900378	EXTRAGALACTIC DIFFUSE EMISSION AND SURVEYS	GIACCONI	LP	500	AN ULTRADEEP SURVEY IN THE CHANDRA DEEP FIELD SOUTH
02910585	GALACTIC DIFFUSE EMISSION AND SURVEYS	Wang	LP	360	CHANDRA SURVEY OF THE GALACTIC RIDGE AROUND THE MILKY WAY CENTER

Subject Category: NORMAL STARS AND WD

Proposal Number: 02200644

Title: TORTURED CORONAE IN THE RAPID BRAKING ZONE

PI Name: Thomas Ayres

Deep HETGS exposures of four key G0-G5 giants will address fundamental questions concerning their hot magnetized coronae by determining temperatures and densities, probing chemical fractionation processes, and exploring plasma dynamics. The giants lie in or near the "Rapid Braking Zone" where moderate mass stars undergo a radical transformation of their outer atmospheres, perhaps as a relic magnetosphere is disrupted by the onset of a solar-like dynamo. ACIS-I CCD spectra of five G/K supergiants will explore the even more extreme extension of the RBZ to higher masses: where hot coronae mix freely with cool stellar winds. These are ideal targets to exploit the experience gained in the Emission Line Project studies of the active binaries Capella and HR 1099.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time
23:49:40.80	+36:25:31.00	HD 223460	ACIS-S	HETG	100
10:46:46.10	-49:25:12.00	HD 93497	ACIS-S	HETG	80
12:51:41.80	+27:32:26.00	HD 111812	ACIS-S	HETG	140

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 02500880

Title: COORDINATED CHANDRA/HST OBSERVATIONS OF THE CRAB NEBULA

PI Name: JEFF HESTER

Recent monitoring of the Crab Nebula with the HST and Chandra sheds new light on both the structure and dynamics of the region into which the wind from the Crab pulsar flows. Bright X-rays predominately originate in regions which contain sharp and highly dynamic structure at visible wavelengths, reflecting the short synchrotron lifetime of the most energetic particles in the nebula. We now have a unique opportunity for an intensive coordinated optical/X-ray campaign to study this dynamic structure. We have an approved and scheduled HST program to monitor the Crab at 11-day intervals during 8 months in the 2000-01 observing season. We request sixteen 25 ks observations with the Chandra ACIS to monitor the X-ray structure and spectrum of Crab during the HST campaign.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time
05:34:31.60	+22:00:56.40	CRAB NEBULA	ACIS-S	NONE	200

Subject Category: NORMAL GALAXIES

Proposal Number: 02600758

Title: THE X-RAY POINT SOURCE POPULATION IN SPIRAL GALAXIES

PI Name: Andrea Prestwich

Emission from discrete sources dominates the X-ray luminosity in spiral galaxies. We propose to survey a sample of nearby spiral galaxies to characterise the properties of the discrete sources. We have chosen nearby, face-on galaxies which span the Hubble sequence for spirals. Chandra's superb imaging capability will allow us to detect sources down to a luminosity of 4e36 erg s^-1 in the ROSAT band. We aim to classify souces as accretion powered binaries (Low or High Mass) or supernova remnants. Our survey will go more than a factor of 20 deeper than the deepest ROSAT pointings of the same galaxies. This data will enable us to look for trends in the characteristics of discrete sources with Hubble type, metallicity and stellar population.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time
03:17:18.30	-41:06:28.00	NGC 1291	ACIS-S	NONE	35
08:53:32.80	+51:18:50.00	NGC 2681	ACIS-S	NONE	170
12:22:32.00	+29:53:43.00	NGC 4314	ACIS-S	NONE	36
13:37:00.80	-29:51:59.00	NGC 5236	ACIS-S	NONE	10
01:36:41.70	+15:46:59.00	NGC 628	ACIS-S	NONE	94
14:03:12.50	+54:20:55.00	NGC 5457	ACIS-S	NONE	10
23:34:27.40	-36:06:05.00	IC 5332	ACIS-S	NONE	112
00:52:04.60	+47:33:04.00	NGC 278	ACIS-S	NONE	80

Subject Category: ACTIVE GALAXIES AND QUASARS

Proposal Number: 02700294

Title: DETERMINING THE NATURE OF THE VARIABLE ABSORPTION IN NGC 3783 WITH CHANDRA/HST

PI Name: Ian George

We propose 5 Chandra/HETG observations of NGC 3783, each simultaneous with HST/STIS observations already approved. The observations will allow the accurate determination of the variable continuum, absorption & emission line properties known to exist in this Seyfert, and constitute the most comprehensive study possible of the nature, origin and evolution of the X-ray & UV absorbers in an AGN. Such absorbers constitute a major component of the circumnuclear gas in AGN, and only the HETG has the resolution to make these measurements. It is vital to perform such a detailed study early in the mission to facilitate the correct interpretation of the Chandra & XMM observations of this and other AGN. We also ask the TAC to approve a restructuring of Chandra time already awarded to this study.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time
11:39:02.40	-37:44:24.00	NGC 3783	ACIS-S	HETG	710

Subject Category: ACTIVE GALAXIES AND QUASARS

Proposal Number: 02700728

Title: FINDING THE BARYONS IN THE LOW REDSHIFT UNIVERSE.

PI Name: Smita Mathur

Recent estimates of the primordial deuterium abundance, combined with the theory of big bang nucleosynthesis (BBN), imply a baryon density parameter $\Omega_b \approx 0.04 h_{70}^{-2}$. The main reservoir of low redshift baryons is still ``missing''. All the observed stellar and gaseous components add up to only $\Omega_b \approx 0.004h_{70}^{-1}$, a factor of ten below the BBN abundance. Hydrodynamic cosmological simulations predict that a large fraction of the low redshift baryons should reside in a hot diffuse intergalactic medium (IGM). We propose to exploit the excellent spectral resolution of Chandra gratings to probe the low redshift IGM with sensitive X-ray spectroscopy. We expect to detect the main reservoir of low redshift baryons with observations of OVII absorption lines.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time
18:21:57.30	+64:20:36.40	H1821+643	ACIS-S	LETG	500

Subject Category: CLUSTERS OF GALAXIES

Proposal Number: 02800845

Title: A COMPLETE X-RAY CLUSTER SAMPLE AT Z > 0.8

PI Name: Spencer Stanford

We propose to observe three X-ray selected clusters of galaxies from the RDCS, one at z = 1.1 and two at z ~ 0.8. In conjunction with other data already being obtained by Chandra and XMM, we would then have luminosity and temperature measurements for a complete sample of 8 clusters at z > 0.8. We will produce the first temperature function at these high redshifts. Using Chandra's high angular resolution, we can minimize the contamination from point sources, a serious problem at faint flux limits, as well as study the spatial properties of the intra-cluster medium. With this combination of temperatures, luminosities, and spatial profiles, we will both probe the cluster mass function of the universe at high redshift and study the thermal history of the intra-cluster medium.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time
09:10:43.80	+54:22:04.00	RX J0910+5422	ACIS-I	NONE	190
13:17:21.40	+29:11:25.00	RX J1317.4+2911	ACIS-I	NONE	115
13:50:46.10	+60:07:09.00	RX J1350.0+6007	ACIS-I	NONE	60

Subject Category: EXTRAGALACTIC DIFFUSE EMISSION AND SURVEYS

Proposal Number: 02900196

Title: THE CHANDRA DEEP SURVEY OF THE HUBBLE DEEP FIELD NORTH (HDF-N) AREA

PI Name: William Brandt

We propose to extend the Chandra X-ray survey of the HDF-N and its vicinity with a 475 ks exposure; this will give 1 Ms of total coverage on this field and will fulfill one of Chandra's central design goals. We should remain photon limited to 1 Ms and will probe the X-ray Universe more than four times deeper than any observation to date. We should resolve essentially all of the X-ray background from 0.5-8 keV and will study obscured and high-redshift active galaxies, advection dominated sources, starbursts, X-ray binaries, clusters and groups, and diffuse X-ray emission. The HDF-N field is an ideal one for multiwavelength follow-up studies due to the enormous database already in place. All data are to be placed in the public archive immediately and we will request no GO science funding.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time
12:36:49.40	+62:12:58.00	HDF-N	ACIS-I	NONE	475

Subject Category: EXTRAGALACTIC DIFFUSE EMISSION AND SURVEYS

Proposal Number: 02900378

Title: AN ULTRADEEP SURVEY IN THE CHANDRA DEEP FIELD SOUTH

PI Name: RICCARDO GIACCONI

We propose to exploit the unique combination of angular resolution, sensitivity and field-of-view of the Chandra ACIS imager to perform the deepest X-ray survey ever in the well-studied "Chandra Deep Field South" (CDFS). With a total integration time of 1.5 Msec (request for this AO: 1 Msec) we reach a 0.5-2 keV flux limit of 2E-17 cgs. We aim to detect >500 sources, i.e. AGN to z=10, clusters to z=3 and starburst galaxies to z~1. Simulations based on the existing 130 ksec observation in the CDFS and realistic source counts and correlation function models show, that Chandra exposures will not be background or confusion limited up to 3Msec. We propose to make the Chandra data public immediately.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time
03:32:27.50	-27:48:23.00	CDFS	ACIS-I	NONE	500

Subject Category: GALACTIC DIFFUSE EMISSION AND SURVEYS

Proposal Number: 02910585

Title: CHANDRA SURVEY OF THE GALACTIC RIDGE AROUND THE MILKY WAY CENTER

PI Name: Q. Daniel Wang

We propose an X-ray survey of a 2.4x0.7 square deg field around the Galactic center, using a set of Chandra ACIS pointings. With the unprecedented spatial and spectral resolutions as well as the broad energy coverage, this survey will provide an invaluable database for studying X-ray pulsars, binaries, supernova remnants, and superbubbles as well as many unique features observed in the field. The resultant exquisite X-ray images, complemented by an existing large-scale ROSAT PSPC mapping in soft X-ray, will allow for direct comparison with similar maps in radio and infrared. In particular, the survey will provide an excellent opportunity to determine the origin of the well-known Galactic ridge X-ray emission.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time
17:43:05.00	-29:50:10.00	GCS 1	ACIS-I	NONE	12
17:44:06.20	-29:28:35.80	GCS 3	ACIS-I	NONE	12
17:44:36.60	-29:17:47.00	GCS 4	ACIS-I	NONE	12
17:45:07.00	-29:06:59.00	GCS 5	ACIS-I	NONE	12
17:46:07.30	-28:45:21.00	GCS 6	ACIS-I	NONE	12
17:46:37.40	-28:34:31.00	GCS 7	ACIS-I	NONE	12
17:47:37.10	-28:12:50.00	GCS 8	ACIS-I	NONE	12
17:48:06.80	-28:01:59.00	GCS 9	ACIS-I	NONE	12
17:44:25.30	-29:46:01.00	GCS 11	ACIS-I	NONE	12
17:44:55.80	-29:35:13.00	GCS 12	ACIS-I	NONE	12
17:45:26.20	-29:24:24.00	GCS 13	ACIS-I	NONE	12
17:45:56.50	-29:13:35.00	GCS 14	ACIS-I	NONE	12
17:46:26.70	-29:02:45.00	GCS 15	ACIS-I	NONE	12
17:47:26.70	-28:41:05.00	GCS 16	ACIS-I	NONE	12
17:47:56.60	-28:30:14.00	GCS 17	ACIS-I	NONE	12
17:48:26.40	-28:19:23.00	GCS 18	ACIS-I	NONE	12
17:48:56.10	-28:08:31.00	GCS 19	ACIS-I	NONE	12
17:42:15.30	-29:43:30.00	GCS 20	ACIS-I	NONE	12
17:42:46.00	-29:32:43.00	GCS 21	ACIS-I	NONE	12
17:43:16.60	-29:21:56.00	GCS 22	ACIS-I	NONE	12
17:44:17.50	-29:00:21.00	GCS 24	ACIS-I	NONE	12
17:44:47.80	-28:49:33.00	GCS 25	ACIS-I	NONE	12
17:45:18.00	-28:38:45.00	GCS 26	ACIS-I	NONE	12
17:45:48.10	-28:27:55.00	GCS 27	ACIS-I	NONE	12
17:46:18.10	-28:17:06.00	GCS 28	ACIS-I	NONE	12
17:46:47.90	-28:06:16.00	GCS 29	ACIS-I	NONE	12
17:47:17.70	-27:55:26.00	GCS 30	ACIS-I	NONE	12
17:43:35.60	-29:39:23.30	GCS 2	ACIS-I	NONE	12
17:43:54.70	-29:56:49.00	GCS 10	ACIS-I	NONE	12
17:43:47.10	-29:11:09.00	GCS 23	ACIS-I	NONE	12

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