Extragalactic abstracts - IRSA - California Institute of Technology

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Spitzer_Approved_Extragalactic Mar 25, 10 16:24 Page 423/742 Spitzer Space Telescope − General Observer Proposal #20623 The bolometric output of luminous obscured AGN Principal Investigator: Andrea Comastri Institution: INAF−Bologna, Italy Technical Contact: Andrea Comastri, INAF−Bologna, Italy Co−Investigators: Cristian Vignali, Dipartimento di Astronomia, Bologna, Italy Francesca Pozzi, INAF− Bologna, Italy Francesca Civano, Dipartimento di Astronomia, Bologna, Italy Lucia Pozzetti, INAF−Bologna, Italy Marco Mignoli, INAF−Bologna, Italy Carlotta Gruppioni, INAF−Bologna, Italy Marcella Brusa, Max−Planck−Institut für extraterrestrische Physik, Fabrizio Fiore, INAF−Roma, Italy Paolo Ciliegi, INAF−Bologna, Italy Roberto Maiolino, INAF−Arcetri, Italy Giovanni Zamorani, INAF−Bologna, Italy Science Category: AGN/quasars/radio galaxies Observing Modes: IracMap MipsPhot Hours Approved: 44.9 Abstract: We propose Spitzer observations with both IRAC and MIPS of a well defined sample of hard X−ray selected obscured AGN serendipitously discovered by XMM−Newton in the 2−10 keV band. The key scientific issues we plan to address with the proposed broad−band infrared observations are: (a) A solid estimate of the bolometric luminosity of accretion−powered, obscured sources and of the correlations between hard X−ray properties (luminosity, obscuration, spectral slope) and infrared spectral energy distribution. (b) To recover the nuclear spectral energy distribution of those AGN for which the presence of supermassive black hole is inferred from the X−ray emission but which remains elusive from observations at optical−UV and near−infrared wavelengths. (c) A probe of the physical status of the dense circumnuclear matter responsible of the X−ray obscuration and dust reprocessed infrared emission by comparison with the AGN unified model predictions. The proposed sample, selected from a shallow, large area, hard X−ray survey (HELLAS2XMM), contains the most luminous members of the population of highly obscured AGN responsible for the X−ray background. It is thus well suited for a pilot Spitzer program (40 hours) which will allow us to investigate the so far poorly known spectral energy distribution of luminous, obscured Type II quasars in the mid−and far−infrared domains. Spitzer_Approved_Extragalactic Printed_by_SSC Mar 25, 10 16:24 Page 424/742 Spitzer Space Telescope − Archive Research Proposal #20680 Studying the Populations of Radio Sources in the Bootes Deep Field Principal Investigator: Steve Croft Institution: LLNL Technical Contact: Steve Croft, University of California, Davis Co−Investigators: Wil van Breugel, LLNL Wim de Vries, UC Davis Adam Stanford, UC Davis Science Category: AGN/quasars/radio galaxies Dollars Approved: 50000.0 Abstract: Our very deep low−frequency (325 MHz) radio observations of the Bootes deep field provide an excellent opportunity to study the evolution of the most distant and powerful radio galaxies, in addition to examining the "normal" radio galaxies which make up the bulk of the radio population at more moderate redshifts. Many previous studies have focussed on the most extreme objects, and we wish to put these studies into context by carrying out a census of the radio population over a range in radio spectral index down to sub−mJy radio flux levels. The release into the archive this semester of the IRAC and MIPS data in this field make this project tractable and timely. By extracting SED information from the Spitzer data, combined with data from the NOAO Deep Wide Field Survey and radio flux and radio "color" (spectral index) information, we can understand the different populations of AGN and starburst galaxies and connections between them. By measuring correlation functions we can understand their clustering and their interrelationships with their environments. The Spitzer data will allow us to fit IR luminosity functions for the radio sources, and in conjunction with other statistical tools, to determine the evolution of these objects. And comparison with other studies of this field will enable us to tell how the various populations of radio sources are related to other types of object. The Spitzer, NDWFS and 1.4 GHz radio data on this field already provide a tantalising opportunity to discover the connections between the IR, optical and radio populations; the addition of our low−frequency radio data provides a key discriminator which will enable us to understand these populations more fully. Thursday March 25, 2010 xgal_covers.txt 212/371
Spitzer_Approved_Extragalactic Mar 25, 10 16:24 Page 425/742 Spitzer Space Telescope − Directors Discretionary Time Proposal #469 Joint Spitzer and AGILE observations of the blazar 3C 454.3 Principal Investigator: Immacolata Donnarumma Institution: INAF, ISAF−Rome Technical Contact: Immacolata Donnarumma, INAF, ISAF−Rome Co−Investigators: Filippo D’Ammando, INAF−IASF Rome Science Category: AGN/Quasars/Radio Galaxies Observing Modes: IrsStare Hours Approved: 0.8 Abstract: We require SPITZER IRAC and MIPS observations for multifrequency follow−up of the blazar 3C 454.3. During the last three days AGILE is revealing a strong activity in the gamma−rays band. Joint Spitzer and AGILE observations offers the unprecedented great opportunity to study the correlated variability in the low and high energy peaks. This will contribute to improve the understanding of the structure of the inner jet, the origin of the seed photons for the IC process and then discriminating the different emission models in the red blazars during their high gamma−rays activity. The AGILE Team is going to activate a similar ToO to Swift, while a monitoring in the optical energy band is occurring thanks to WEBT. Therefore Spitzer observation of this blazar will give a unique and extraordinary opportunity to investigate its electromagnetic emission on a wide energy range in its strong flaring activity and then to determine its Spectral Energy Distribution. SSC Note: IRS SL/LL observations were approved for this ToO program. Spitzer_Approved_Extragalactic Printed_by_SSC Mar 25, 10 16:24 Page 426/742 Spitzer Space Telescope − General Observer Proposal #3348 Probing jet physics with the TeV blazar PKS 2155−304 Principal Investigator: Guillaume Dubus Institution: Ecole Polytechnique Technical Contact: Guillaume Dubus, Ecole Polytechnique Co−Investigators: Berrie Giebels, Laboratoire Leprince−Ringuet Stefan Wagner, Landessternwarte Heidelberg Science Category: AGN/quasars/radio galaxies Observing Modes: MipsPhot Hours Approved: 8.8 Abstract: Blazars offer unique opportunities to understand the physics of relativistic jets. TeV emission from the blazar PKS 2155−304 has been detected in every single pointing of the newly built HESS array of Cherenkov telescopes in 2002−3. Our goal is to understand this new regime of low−level TeV emission which could not until now be studied for lack of sensitivity. We propose to obtain IR and TeV observations of the blazar PKS 2155−304. Spitzer observations between 24−160 microns would offer precious constraints on the synchrotron emission from the bulk of the non−thermal distribution of particles. The ability of Spitzer to obtain precise photometry would enable the first measurements of IR variability, providing insights into the acceleration and cooling timescales. Thursday March 25, 2010 xgal_covers.txt 213/371
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