Extragalactic abstracts - IRSA - California Institute of Technology

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Spitzer_Approved_Extragalactic Mar 25, 10 16:24 Page 543/742 Spitzer Space Telescope − General Observer Proposal #20808 Spitzer Imaging of Spectroscopically−Confirmed, X−ray−Luminous, Obscured AGN Principal Investigator: Daniel Stern Institution: JPL/Caltech Technical Contact: Daniel Stern, JPL/Caltech Co−Investigators: Megan Eckart, Caltech Fiona Harrison, Caltech David Helfand, Columbia Science Category: AGN/quasars/radio galaxies Observing Modes: IracMap MipsPhot Hours Approved: 15.0 Abstract: We request 18.2 hours of IRAC and MIPS imaging to investige the mid−IR properties of spectroscopically−confirmed hard X−ray sources from five moderately−deep (50 − 200 ks) Chandra fields. These sources, identified in the SEXSI (Serendipitous Extragalactic X−ray Source Identification) survey, include (1) 14 X−ray luminous, narrow−lined quasars, typical of the class of object which dominates the X−ray background beyond 5 keV, and yet remained largely unidentified prior to the launch of Chandra and XMM−Newton; (2) 31 X−ray bright, optically−normal galaxies, sources which appear inactive at optical wavelengths but reveal the presence of an active nucleus at X−ray energies; and (3) 44 optically−faint X−ray sources which lack spectroscopic classification currently and are likely to be either high−redshift, or heavily−obscured. We will investigate the mid−IR properties of these obscured AGN, comparing them to a control sample of 25 broad−lined X−ray luminous AGN in the same fields. This survey will also allow investigation of the X−ray properties of mid−IR−selected AGN. Spitzer_Approved_Extragalactic Printed_by_SSC Mar 25, 10 16:24 Page 544/742 Spitzer Space Telescope − General Observer Proposal #30515 Compact Symmetric Objects: A New Class of "Buried" AGN? Principal Investigator: John Stocke Institution: University of Colorado Technical Contact: John Stocke, University of Colorado Co−Investigators: Jeremy Darling, University of Colorado Eric Perlman, University of Maryland, Baltimore County Fred Hearty, University of Colorado Science Category: AGN/quasars/radio galaxies Observing Modes: IrsPeakupImage IrsStare Hours Approved: 7.8 Abstract: We propose to obtain mid−IR spectra with Spitzer/IRS to search for highly obscured (a.k.a. "buried") AGN in an unusual type of powerful radio galaxy called "Compact Symmetric Objects" (CSOs). Evidence from VLBI radio imaging of CSOs strongly suggest that these sources are very young radio galaxies (500−3000 years old) which will eventually become large−scale powerful AGN. Thus, we are viewing the nuclear regions of these galaxies at the time of the "birth" of these AGN. While there is substantial multi−wavelength evidence for considerable nuclear gas in CSOs, near−IR images obtained by us using HST/NICMOS show no strong evidence for extremely large extinctions since the nuclear regions of these CSOs show normal elliptical galaxy profiles at H−band. But no AGN point source is seen. Either CSOs are "naked AGN" with no nuclear non−thermal continuum or reprocessed line emission or these AGN are so extincted as to be visible only in the mid−IR. We seek to test these two hypotheses and thus to determine whether gas accretion powers CSOs or whether CSOs (and all radio−loud AGN by extension) require a different type of energy source like Black Hole spin energy. Thursday March 25, 2010 xgal_covers.txt 272/371
Spitzer_Approved_Extragalactic Mar 25, 10 16:24 Page 545/742 Spitzer Space Telescope − General Observer Proposal #50591 Witnessing the Birth of Radio Galaxies: Spitzer Spectroscopy of Nearby Compact Symmetric Objects Principal Investigator: John Stocke Institution: University of Colorado Technical Contact: John Stocke, University of Colorado Co−Investigators: Kyle Willett, University of Colorado Jeremy Darling, University of Colorado Eric Perlman, Florida Institute of Technology Science Category: AGN/quasars/radio galaxies Observing Modes: IrsStare IrsPeakupImage Hours Approved: 20.0 Abstract: We propose to obtain mid−IR spectra with the IRS to search for highly obscured (a.k.a. "buried") AGN in an unusual type of powerful radio galaxies called "Compact Symmetric Objects" (CSOs) and to determine whether they show any evidence for accreting gas. Evidence from VLBI proper motion studies finds that CSOs are very young AGN (500−3000 years old) which will eventually become large−scale powerful radio galaxies (similar to "mini−Cygnus As"). Thus, we are viewing the nuclear regions of these galaxies at the time of the "birth" of these AGN. While there is substantial multi−wavelength evidence for modest amounts of nuclear gas and dust in CSOs, near−IR HST images and ground−based spectra show no evidence for extremely large dust extinction, on−going mergers, or reprocessed line and continuum emission indicative of an accretion disk. Rather, the nuclear regions of CSOs show normal elliptical galaxy profiles at H−band with no evidence for an AGN point source. It is thus probable that either CSOs are "naked AGN" with no nuclear non−thermal continuum or reprocessed line emission, or that the AGN are so heavily extincted that the accreting gas is visible only in the mid−infrared. Our Cycle 3 IRS observations of a small subsample of CSOs show considerable diversity in their mid−infrared spectra; some resemble modestly starbursting galaxies, while others are akin to PG quasars. Tellingly, NONE of the five low−redshift CSOs previously observed with the IRS show confirmed [NeV] detections, suggesting that CSOs as a class lack accreting nuclear gas (a 2.5 sigma result based upon 5 objects), despite their recent launch of luminous, non−thermal radio jets. We propose to observe the remaining four z < 0.1 CSOs to determine whether they are powered by gas accretion or whether CSOs (and by extension, all radio−loud AGN) require a different type of energy source such as black hole spin. Spitzer_Approved_Extragalactic Printed_by_SSC Mar 25, 10 16:24 Page 546/742 Spitzer Space Telescope − General Observer Proposal #20466 Galaxies with Old Stellar Populations in Radio Source Fields at z ~ 3.8 Principal Investigator: Alan Stockton Institution: University of Hawaii Technical Contact: Alan Stockton, University of Hawaii Co−Investigators: Elizabeth McGrath, Institute for Astronomy, University of Hawaii Gabriela Canalizo, University of California at Riverside Science Category: AGN/quasars/radio galaxies Observing Modes: IracMap Hours Approved: 15.7 Abstract: There is persuasive evidence that powerful radio sources are signposts for strongly overdense regions in the early universe. It is in such regions that the processes of galaxy formation and evolution are expected to have proceeded most rapidly, and thus in which we will find the earliest massive galaxies to have formed in the universe. We have been identifying and determining morphologies for galaxies comprising essentially pure old stellar populations at redshifts of 1.5 and 2.5, with the surprising result that, for the three of these galaxies for which we have been able to obtain high−resolution images from adaptive−optics imaging, all are dominated by massive disks of old stars. In two of these, any bulge component accounts for
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