Extragalactic abstracts - IRSA - California Institute of Technology

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Spitzer_Approved_Extragalactic Mar 25, 10 16:24 Page 615/742 Spitzer Space Telescope − General Observer Proposal #30455 Mixing It Up : Gas, Stars, Starbirth, and AGN in a Supercluster at z = 0.9 Principal Investigator: Lori Lubin Institution: University of California Technical Contact: Lori Lubin, University of California Co−Investigators: Christopher Fassnacht, UC Davis Roy Gal, University of Virginia Gordon Squires, SSC/Caltech Mark Lacy, SSC/Caltech Lin Yan, SSC/Caltech John McKean, Max Planck Institut fuer Radioastronomie Bonn Science Category: galaxy clusters and groups Observing Modes: IracMap MipsScan Hours Approved: 29.6 Abstract: We propose a joint Spitzer/HST program to map the best−studied large scale structure at high redshift −− a massive twelve−cluster supercluster at z = 0.9 which extends 15 Mpc x 100 Mpc. Because clusters are actively forming at this redshift, and significant evolution has already been observed in their galaxy populations, this survey will provide the crucial link between large scale structure and galaxy−scale physics. The supercluster is already the subject of a multi−faceted program including (1) deep r’i’z’K imaging from the Palomar 5−m to measure optical/near−IR colors, (2) spectroscopy with DEIMOS on the Keck 10−m to measure stellar content, [OII] equivalent widths, and internal velocities for over 330 supercluster members, (3) high−angular−resolution Chandra and VLA observations to study the starburst and AGN populations, and (4) an 80 ksec XMM observation to quantify the cluster gas properties and the amount of diffuse emission from the low−density filaments. The proposed 3.6−24 micron mapping is an essential complement to this program because it provides more accurate measures of stellar mass, star formation rate, and nuclear/starburst activity across the entire structure. The ACS observations will provide equal detail on galaxy structural properties and morphology. Together, the deep mid−infrared observations and the high−angular−resolution HST imagery (along with our coordinated ground and space−based data) will allow us to measure the stellar mass function, stellar population ages, and star formation rates over the full range of environmental densities; use galaxy morphology to determine what type of galaxies host AGN and which physical processes are responsible for gas−fueling events; quantify the IR/radio/X−ray correlations at z = 0.9; and determine the effect of large scale structure on the stellar and gas content of galaxies in the high−redshift Universe. Spitzer_Approved_Extragalactic Printed_by_SSC Mar 25, 10 16:24 Page 616/742 Spitzer Space Telescope − General Observer Proposal #50096 Unveiling a Population of Hidden AGN in Clusters of Galaxies Principal Investigator: Paul Martini Institution: Ohio State University Technical Contact: Paul Martini, Ohio State University Co−Investigators: John Mulchaey, OCIW Daniel Kelson, OCIW Science Category: galaxy clusters and groups(low−z) Observing Modes: IracMap MipsPhot Hours Approved: 18.0 Abstract: We have conducted an X−ray and visible−wavelength study of eight clusters of galaxies and measured an unexpectedly high AGN fraction of 5 percent, or approximately five times higher than previous estimates. However, these AGN classifications remain uncertain because all but four are based on X−ray luminosity and flux ratios as the galaxies lack the classical, visible−wavelength emission−lines characteristic of AGN. We propose Spitzer IRAC and 24micron MIPS photometry of our AGN candidates to determine if they are genuine AGN based on evidence for hot dust emission in the infrared. We will also use these observations to determine if these AGN lack visible−wavelength emission lines because they are intrinsically optically dull, or if they are heavily obscured. A previously hidden AGN population in clusters of galaxies has many interesting implications for AGN fueling, feedback, and black hole growth in rich environments, while the nature of these X−ray bright but optically normal galaxies make them cluster analogs of the faint field AGN uncovered with Spitzer and Chandra. Thursday March 25, 2010 xgal_covers.txt 308/371
Spitzer_Approved_Extragalactic Mar 25, 10 16:24 Page 617/742 Spitzer Space Telescope − General Observer Proposal #20345 Starbursts and Supercavities in Clusters of Galaxies Principal Investigator: Brian McNamara Institution: Ohio University Technical Contact: Brian McNamara, Ohio University Co−Investigators: Robert O’Connell, University of Virginia Michael Wise, MIT Megan Donahue, Michigan State University Mark Voit, Michigan State University Paul Nulsen, CfA Science Category: galaxy clusters and groups Observing Modes: IrsStare Hours Approved: 25.7 Abstract: Evidence is mounting that AGN feedback injects significant energy into the massive hot atmospheres of large elliptical galaxies, groups, and clusters of galaxies. This inhibits accretion and limits the star formation that would otherwise occur in cooling flows. We propose to investigate this feedback process using Spitzer/IRS mid−IR spectral maps of six well studied cooling flow clusters. The maps will be used to obtain accurate measures of the star formation rate, dust distribution and AGN activity. These will be compared to measures of feedback power from shocks and relativistic−jet cavities in the X−ray emitting gas and the state of the hot gas in the vicinity of the AGN. Our prime target, MS0735.6+7421, has a pair of supergiant cavities and shocks that have deposited 6e61 erg into the surrounding gas. The central supermassive black hole grew in mass by roughly 1/3 during this outburst. The basic mechanisms of cooling and energy feedback which can be studied in the mid−IR in these systems are relevant to a wide range of galaxy astrophysics. Spitzer_Approved_Extragalactic Printed_by_SSC Mar 25, 10 16:24 Page 618/742 Spitzer Space Telescope − General Observer Proposal #50292 A Complete Census of Star−formation/AGN Activity in a z=0.14 ‘‘Proto−cluster’’ Principal Investigator: Glenn Morrison Institution: University of Hawaii Technical Contact: Glenn Morrison, University of Hawaii Co−Investigators: Neal Miller, NRAO/JHU Min Yun, UMass Frazer Owen, NRAO David Frayer, NHSC−Caltech Stephane Arnouts, CFHT Mark Dickinson, NOAO William Keel, UAlabama Chris Miller, CTIO Science Category: galaxy clusters and groups(low−z) Observing Modes: IracMap MipsScan Hours Approved: 24.8 Abstract: We propose deep, wide−field IRAC/MIPS 24um and 70um observations of one of the richest, developing filamentary−type clusters in the nearby universe for the purpose for measuring galaxy activity (AGN/star−formation;SF) down to M*+3 with SF rates >1M_solar/yr. Given the rapid progression of ‘‘downsizing’’ since z
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Extragalactic abstracts - IRSA - California Institute of Technology

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