Accepted Cycle 12 Observing Proposals

EXTRAGALACTIC DIFFUSE EMISSION & SURVEYS

Proposal Number	Subject Category	PI Name	Title
12900191	EXTRAGALACTIC DIFFUSE EMISSION AND SURVEYS	Smail	Testing inverse Compton heating in high-z galaxies
12900343	EXTRAGALACTIC DIFFUSE EMISSION AND SURVEYS	Nicastro	Securing a Detection of the Bulk of the Missing Baryons
12900486	EXTRAGALACTIC DIFFUSE EMISSION AND SURVEYS	Levan	The differing environments of dark gamma-ray bursts
12900533	EXTRAGALACTIC DIFFUSE EMISSION AND SURVEYS	Krongold	Assessing the WHIM detection towards Mkn421
12900589	EXTRAGALACTIC DIFFUSE EMISSION AND SURVEYS	Galeazzi	Properties of the Warm-Hot Intergalactic Medium Using X-ray/SZ Cross-Correlation
12900635	EXTRAGALACTIC DIFFUSE EMISSION AND SURVEYS	Wang	A CHandra survey of Extended Emission-line Regions in nearby Seyfert galaxies (CHEERS)
12900691	EXTRAGALACTIC DIFFUSE EMISSION AND SURVEYS	Krumpe	Filling the 15 micron Gap: Search for Compton-thick Accretion with Chandra and AKARI in the NEP Deep Field
12900781	EXTRAGALACTIC DIFFUSE EMISSION AND SURVEYS	Galeazzi	Properties of a WHIM Filament in the Shapley Supercluster

Subject Category: EXTRAGALACTIC DIFFUSE EMISSION AND SURVEYS

Proposal Number: 12900191

Title: Testing inverse Compton heating in high-z galaxies

PI Name: Ian Smail

Galaxy formation models require feedback to quench star formation in massive galaxies at high-z. Inverse Compton (IC) scattering by relativistic electrons in radio jets off the CMB or FIR photons from starbursts within the galaxies is one potential mechanism. Our Chandra observations of two radio galaxies at z=3.8 provide strong evidence for IC scattering and here we request time for 100-ks observations of two FIR-faint z=3.6 radio galaxies to determine the ubiquity of IC halos around massive galaxies and to distinguish between the CMB and starbursts as the origin of the seed photon field. These observations will test whether IC heating is an important mechanism for limiting the growth of the most massive galaxies at high z and determine its origin, necessary to understand its evolution.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time
21:44:07.50	+19:29:15.00	4C19.71	ACIS-I	NONE	100
12:45:38.30	+03:23:21.00	4C03.24	ACIS-I	NONE	100

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	+11:11:24.00	1ES 1553+113	HRC-S	LETG	500

Subject Category: EXTRAGALACTIC DIFFUSE EMISSION AND SURVEYS

Proposal Number: 12900486

Title: The differing environments of dark gamma-ray bursts

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 complete 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 dark GRBs originating in more luminous and (so far exclusively) merging galaxies. Our increased sample will allow us to make strong statistical statements as to these differences and so elucidate both the nature of dark GRBs, and the relationships between GRBs and both obscured and unobscured star formation.

Target Name	Det.	Grating	Exp.Time
DARK-GRB1	ACIS-S	NONE	15
DARK-GRB2	ACIS-S	NONE	15
DARK-GRB3	ACIS-S	NONE	15

Subject Category: EXTRAGALACTIC DIFFUSE EMISSION AND SURVEYS

Proposal Number: 12900533

Title: Assessing the WHIM detection towards Mkn421

PI Name: Yair Krongold

We propose a TOO program to re-observe Mkn421 in an exceptionally high flux state, with the Chandra HRCS-LETG for a total exposure time of 170 ks. This proposal will study, on a new spectrum, the two WHIM filaments suggested towards this source, and asses their actual statistical significance. This will settle a long-standing controversy on the presence of WHIM filaments along this short path-length (130 Mpc) line of sight. Moreover, doubling the S/N of the existing Chandra spectrum, will allow us to measure with unprecedented accuracy the physical properties of these systems (if confirmed), including their metalicities (with the addition of HST-COS calibration data). This in turn, will give important clues on the contribution of the WHIM to the ``missing baryons.''

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time
11:04:27.30	+38:12:32.00	Mkn421	HRC-S	LETG	170

Subject Category: EXTRAGALACTIC DIFFUSE EMISSION AND SURVEYS

Proposal Number: 12900589

Title: Properties of the Warm-Hot Intergalactic Medium Using X-ray/SZ Cross-Correlation

PI Name: Massimiliano Galeazzi

We propose to study the properties of the WHIM through the cross-correlations between X-ray data and Microwave background data from the Atacama Cosmology Telescope (ACT) due to the SZ effect. We will focus on a field that has been extensively investigated by ACT and with optical follow-ups and independent radio observations. The different dependence on electron density between X-ray emission and SZ effect will be used to characterize the density distribution of the WHIM. Chandra s high angular resolution, combined with the multi-wavelength approach is also invaluable to identify discrete sources in the field of view.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time
05:16:60.00	-52:00:00.00	Blanco Cosmological Survey	ACIS-S	NONE	150

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	-35:59:57.30	NGC 1386	ACIS-S	NONE	80
10:48:23.50	-25:09:43.40	NGC 3393	ACIS-S	NONE	70
12:25:46.80	+12:39:43.80	NGC 4388	ACIS-S	NONE	30
12:35:36.60	-39:54:33.40	NGC 4507	ACIS-S	NONE	45
06:15:36.40	+71:02:15.10	Mrk 3	ACIS-S	NONE	30
01:43:57.80	+02:21:00.00	Mrk 573	ACIS-S	NONE	80

Subject Category: EXTRAGALACTIC DIFFUSE EMISSION AND SURVEYS

Proposal Number: 12900691

Title: Filling the 15 micron Gap: Search for Compton-thick Accretion with Chandra and AKARI in the NEP Deep Field

PI Name: Mirko Krumpe

We propose a 3x4 grid of ACIS-I observations within the AKARI NEP Deep Field to search for Compton-thick (CT) AGN at z~1. This field has deep 2-24 micron imaging that includes coverage of the Spitzer gap at 9-20 microns. Together with spectroscopic and accurate photo-z from extensive optical follow-up programs, this has enabled us to efficiently identify AGNs at z~1 by their IR spectral energy distribution. The CXO data will allow us to classify these few hundred IR-selected AGN candidates into unabsorbed (type I), Compton-thin absorbed (type II), and CT AGNs. X-ray stacking of the CT AGNs will allow us to quantify their contribution to the X-ray background and accretion. We will verify the CT nature by testing for the expected reflection Fe feature in the rest-frame stacked spectra.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time
17:55:24.00	+66:33:33.00	AKARI-NEP-Deep Field	ACIS-I	NONE	250

Subject Category: EXTRAGALACTIC DIFFUSE EMISSION AND SURVEYS

Proposal Number: 12900781

Title: Properties of a WHIM Filament in the Shapley Supercluster

PI Name: Massimiliano Galeazzi

In a recent Suzaku search for a WHIM filament between A3556 and A3558 in the Shapley Supercluster we found evidence of a significant Ne IX emission and a stronger than usual power law emission, which is generally associate with unresolved point sources. However, the same strong component is not present in two control observations one less than 2 deg away, suggesting a filament origin. Unfortunately Suzaku does not allow any significant point source characterization. In this proposal we request a 10 ks follow-up of our Suzaku observation with Chandra s ACIS-S. This should identify and characterize more than half of the expected point source flux and allow an understanding of the origin of the excess emission, necessary to characterize any possible WHIM filament in the Suzaku observation.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time
13:25:31.70	-31:38:15.10	Shapley filament	ACIS-S	NONE	10

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