Extragalactic abstracts - IRSA - California Institute of Technology

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Spitzer_Approved_Extragalactic Mar 25, 10 16:24 Page 407/742 Spitzer Space Telescope − General Observer Proposal #50818 Discovering Compton−thick AGN over the Widest XMM−Newton Field Principal Investigator: David Alexander Institution: Durham University Technical Contact: David Alexander, Durham University Co−Investigators: Jonathan Gelbord, Durham University Martin Ward, Durham University Andrew Goulding, Durham University Science Category: AGN/quasars/radio galaxies Observing Modes: IrsStare MipsPhot Hours Approved: 23.2 Abstract: Deep X−ray surveys have identified large numbers of AGNs in a relatively obscuration−independent manner. However, there is considerable evidence that >50% of luminous AGNs remain undetected, most of which will be heavily obscured by Compton−thick material. We have used the widest XMM−Newton survey (the Serendipity Survey) to select AGNs in the SDSS that have luminous [OIII] emission but are X−ray undetected down to faint limits, implying ~two orders of magniude of extinction (i.e., likely to be Compton thick). Here we propose for Spitzer−IRS low−resolution spectroscopy and MIPS~24um and 70um observations of 15 objects to measure the dust−reradiated emission from AGN and star−formation components, to confirm if they are Compton−thick AGNs. The sample probes regions of the z−L_AGN plane (z~0.1−0.2; L_X, abs~3x10^41−3x10^43 erg/s) that are not well sampled by deeper narrow−field X−ray surveys. Spitzer_Approved_Extragalactic Printed_by_SSC Mar 25, 10 16:24 Page 408/742 Spitzer Space Telescope − General Observer Proposal #20525 Which FR−I Radio Galaxies Host Broad−Line Radio Galaxies or Quasars? Principal Investigator: Robert Antonucci Institution: University of California, Santa Barbara Technical Contact: David Whysong, National Radio Astronomy Observatory Co−Investigators: David Whysong, University of California, Santa Barbara Pat Ogle, NASA Jet Propulsion Laboratory Makoto Kishimoto, University of Edinburgh Science Category: AGN/quasars/radio galaxies Observing Modes: IrsStare Hours Approved: 40.1 Abstract: According to the simplest Unified Model, all radio galaxies contain hidden quasars surrounded by opaque dusty tori. In that case all radio galaxies should produce strong reprocessed IR emission from the obscuring tori. We’ve shown with Keck mid−IR imaging and the first of our Cycle 1 data on FR II radio galaxies that this is false: while all of the most luminous FR IIs have hidden broad line radio galaxies or quasars, only SOME of the FR IIs at lower luminosity have them! Here we propose to test the FR Is in a similar way. Contrary to popular belief, many of those DO have visible or hidden broad−line nuclei. By identifying which are which, we can infer the probably energy source for each. If a hidden broad line radio galaxy, most of the power is though to come from accretion and most of their luminosity is radiative; otherwise by default probably most of the power comes from black hole rotation and emerges in the form of the the kinetic luminosity of the radio jet. This difference is likely to be manifest in the detailed radio source properties. We will also look for AGN narrow emission lines, and compare our spectra with dusty torus models. Thursday March 25, 2010 xgal_covers.txt 204/371
Spitzer_Approved_Extragalactic Mar 25, 10 16:24 Page 409/742 Spitzer Space Telescope − General Observer Proposal #3624 Unified Models and Power Sources in Radio−Loud AGN Principal Investigator: Robert Antonucci Institution: University of California, Santa Barbara Technical Contact: David Whysong, National Radio Astronomy Observatory Co−Investigators: Patrick Ogle, NASA / JPL David Whysong, University of California, Santa Barbara Science Category: AGN/quasars/radio galaxies Observing Modes: IrsStare Hours Approved: 27.0 Abstract: We propose a simple observational program that will test the unification hypothesis for quasars and FR−II radio galaxies, constrain models of the dusty torus, and determine if the AGN are powered by thermal accretion or a non−thermal (probably rotational) mechanism. Spitzer is uniquely capable of carrying out this investigation with its unprecedented sensitivity. It has been shown directly by optical spectropolarimetry that many of the most powerful FR−II radio galaxies contain quasars hidden by opaque dusty tori; there is substantial statistical evidence that this is true for most or all of them. At somewhat lower powers the situation is not yet clear. Our work and that of others suggests that only a subset of radio galaxies have hidden quasars. We seek to establish this one way or the other and to determine which radio galaxies do or do not have hidden quasars. Spitzer data will also clarify whether statistical anomolies associated with the identification of radio galaxies with quasars can be understood as effects of a large population of physically smaller radio galaxies that lack hidden quasars. This would limit and define the applicability of the Unified Model. For theory, it would determine whether there are black−hole powered sources with just kinetic luminosity and without significant radiative accretion luminosity . Such non−thermal AGN would then have to be attributed to tapping rotational energy. We will also examine and compare the other observational properties of the two types of radio galaxies (hidden quasar or not), providing insight into the physics of the two types of power (accretion and rotation). Spitzer_Approved_Extragalactic Printed_by_SSC Mar 25, 10 16:24 Page 410/742 Spitzer Space Telescope − General Observer Proposal #50795 Non−thermal infrared emission − a unique window on radio galaxy lobes Principal Investigator: Robert Antonucci Institution: University of California, Santa Barbara Technical Contact: Robert Antonucci, UC Santa Barbara Co−Investigators: Lawrence Rudnick, UMN Christian Leipski, UCSB Science Category: AGN/quasars/radio galaxies Observing Modes: IracMap Hours Approved: 7.7 Abstract: Powerful radio galaxies play an essential role in the dynamics and thermodynamics of the intracluster medium. Fundamental questions exist, however, about their energy budget − how much energy is transferred and how they apparently distribute it uniformly. High sensitivity Spitzer observations offer a unique and critical tool for probing the energetics of lobes of radio galaxies and the physics of the relativistic particle acceleration process. The work on e.g. M87 has already shown that the energy going into particle acceleration may seriously affect the amount available for heating the external medium. In this last cold cycle, it is critical to establish whether this is a common phenomenon in radio galaxy lobes, spanning a range of morphologies as in our targets, or whether this is simply another special feature of M87. In order to achieve this goal we here propose to obtain deep IRAC observations of six radio galaxies with exceptionally bright and highly structured radio lobes. Thursday March 25, 2010 xgal_covers.txt 205/371
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Extragalactic abstracts - IRSA - California Institute of Technology

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