Accepted Cycle 14 Observing Proposals

EXTRAGALACTIC DIFFUSE EMISSION & SURVEYS

Proposal Number	Subject Category	PI Name	Title
14900411	EXTRAGALACTIC DIFFUSE EMISSION AND SURVEYS	Smail	Far-infrared powered Inverse Compton halos around high-redshift radio galaxies
14900506	EXTRAGALACTIC DIFFUSE EMISSION AND SURVEYS	Levan	A Chandra/HST survey of dark gamma-ray bursts and their hosts
14900635	EXTRAGALACTIC DIFFUSE EMISSION AND SURVEYS	Krongold	Assessing the WHIM detection towards Mkn421
14900703	EXTRAGALACTIC DIFFUSE EMISSION AND SURVEYS	Tanaka	Studying Giant Filamentary Lobes of Centaurus A
14900848	EXTRAGALACTIC DIFFUSE EMISSION AND SURVEYS	Machacek	Mapping Galaxy Groups and the Hot WHIM in Shapley Supercluster Filaments with Chandra and Suzaku
14900904	EXTRAGALACTIC DIFFUSE EMISSION AND SURVEYS	Civano	The COSMOS Legacy Survey

Subject Category: EXTRAGALACTIC DIFFUSE EMISSION AND SURVEYS

Proposal Number: 14900411

Title: Far-infrared powered Inverse Compton halos around high-redshift radio galaxies

PI Name: Ian Smail

Our Chandra survey of 4 radio galaxies (RG) at z>3, with a range of far-infrared (FIR) luminosities, shows a striking difference in their extended X-ray emission (from inverse Compton, IC, scattering). The two FIR-bright RGs are 4x brighter in the FIR and their IC X-ray halos are also 4x brighter, implying the IC photon source is not the CMB, as typically assumed, but instead is local FIR photons from their dusty starbursts. The IC emission traces the ionised gas halos in all 4 RGs, suggesing it is heating the gas reservoirs which fuels their activity. Thus FIR-driven IC emission may be a new feedback mechanism in the most massive galaxies in the Universe. We will confirm this with 115-ks Chandra observations of two z>3 RGs to test the correlation of their IC X-ray and FIR emission.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time
09:05:30.10	+34:07:57.00	B2 0902+34	ACIS-I	NONE	115
23:30:24.90	+39:27:12.00	B2 2327+39	ACIS-I	NONE	115

Subject Category: EXTRAGALACTIC DIFFUSE EMISSION AND SURVEYS

Proposal Number: 14900506

Title: A Chandra/HST survey of dark gamma-ray bursts and their hosts

PI Name: Andrew Levan

Dark gamma-ray bursts (GRBs) -- where the optical emission is apparently suppressed -- can only be reliably localized by their X-ray afterglows. Here we propose to continue a survey using the sensitivity and point spread function of Chandra to precisely pinpoint the GRB locations, and HST to locate and study the host galaxies. Our results to date are suggestive of most dark GRBs originating in more luminous galaxies than "bright" GRBs. Our new observations will increase the statistical certainty of this result, while simultaneously allowing us to more precisely identify the minority of dark GRBs which most likely originate from the highest redshifts.

Target Name	Det.	Grating	Exp.Time
DARK_GRB1	ACIS-S	NONE	15
DARK_GRB2	ACIS-S	NONE	15
DARK_GRB3	ACIS-S	NONE	15
DARK_GRB4	ACIS-S	NONE	15

Subject Category: EXTRAGALACTIC DIFFUSE EMISSION AND SURVEYS

Proposal Number: 14900635

Title: Assessing the WHIM detection towards Mkn421

PI Name: Yair Krongold

We propose a TOO program to re-observe Mkn421 in high flux state, with the HRCS-LETG for 170 ks to study the two WHIM filaments suggested towards this source. This will settle a controversy on the presence of WHIM filaments along this line of sight. The data will allow us to measure with unprecedented accuracy the physical properties of these systems (if confirmed), including their metalicities (with HST-COS calibration data). This will give important clues on the contribution of the WHIM to the ``missing baryons.'' There is only one possibility out of 10 that this program can be triggered making this is a relatively inexpensive program (only 17 ks of effective time). We were awarded TOO time for this program in the past but the source never reached flux levels high enough to trigger.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time
11:04:27.30	+38:12:31.80	Mkn 421	HRC-S	LETG	170

Subject Category: EXTRAGALACTIC DIFFUSE EMISSION AND SURVEYS

Proposal Number: 14900703

Title: Studying Giant Filamentary Lobes of Centaurus A

PI Name: Yasuyuki Tanaka

Radio source Centaurus A is the closest active galaxy in the Universe (3.7 Mpc). It is surrounded by poorly known giant radio lobes extending for about 600 kpc in the N-S direction. Here we propose Chandra follow-up of four regions in the Southern and Northern lobes where Suzaku time was allocated. We also propose joint Chandra-Suzaku observation toward interacting filamentary region where ASCA found a hint of X-ray emission. The primary goal of the project is to study the filamentary structure of the lobe in X-rays, in the broader context of particle acceleration and energy dissipation processes taking place in inhomogeneous and multi-phase plasma. The obtained results are guaranteed to improve our knowledge regarding not only the Centaurus A, but all jetted active galaxies.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time
13:23:28.00	-45:09:05.00	Cen A Southern Lobe 1	ACIS-I	NONE	20
13:21:34.50	-45:08:09.00	Cen A Southern Lobe 2	ACIS-I	NONE	20
13:25:52.20	-38:56:14.60	Cen A Northern Lobe 1	ACIS-I	NONE	20
13:27:08.40	-39:45:47.10	Cen A Northern Lobe 2	ACIS-I	NONE	20
13:24:38.20	-39:18:46.70	Cen A Northern Lobe 3	ACIS-I	NONE	20

Subject Category: EXTRAGALACTIC DIFFUSE EMISSION AND SURVEYS

Proposal Number: 14900848

Title: Mapping Galaxy Groups and the Hot WHIM in Shapley Supercluster Filaments with Chandra and Suzaku

PI Name: Marie Machacek

29% of the baryon density measured at high redshift are unaccounted for at the present epoch. Since a persistent deficit would challenge our current understanding of the thermodynamics of structure formation and the effects of shocks and galactic outflows on the surrounding gas, resolving this deficit is critical for understanding low-redshift cosmology and galaxy formation. Simulations suggest these baryons emit soft X-rays and should reside along low density filaments in the cosmic web, the WHIM. We propose to combine Chandra ACIS-I with Suzaku XIS observations for 3 large scale filaments in the Shapley Supercluster, the largest overdensity of galaxies and clusters in the z < 0.1 Universe,to identify galaxy groups in these filaments and search for X-ray emission from the WHIM.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time
13:25:48.00	-31:35:41.00	Shapley A	ACIS-I	NONE	20
13:26:28.00	-31:54:06.00	Shapley B	ACIS-I	NONE	20
13:28:21.00	-31:01:56.00	Shapley C	ACIS-I	NONE	20

Subject Category: EXTRAGALACTIC DIFFUSE EMISSION AND SURVEYS

Proposal Number: 14900904

Title: The COSMOS Legacy Survey

PI Name: Francesca Civano

We propose the COSMOS-Legacy Survey covering the entire 1.7deg2 COSMOS/HST area to a uniform depth of ~160ks, expanding the current deep C-COSMOS area by a factor 3, with 56x50 ks pointings for a total of 2.8 Ms. This area and depth proposed are designed to detect~40 z>4, and ~4 z>5 Large Scale Structures on >15' scales, connecting luminous Chandra quasars (among over 200 z>3 quasars) and sub-mm galaxies, a method already proven in C-COSMOS. The area/depth combination also probes mini-quasars at z>7 using anistotropies of the unresolved XRB and the masses of the DM halos hosting X-ray AGN up to z~3 via autocorrelation functions on ~30' scales. Large programs with SCUBA2, NuSTAR, Subaru and Keck over the COSMOS field will identify and get redshifts for all COSMOS-Legacy sources.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time
10:00:29.90	+02:12:40.00	COSMOS Legacy	ACIS-I	NONE	2800

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