Extragalactic abstracts - IRSA - California Institute of Technology

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Spitzer_Approved_Extragalactic Mar 25, 10 16:24 Page 551/742 Spitzer Space Telescope − General Observer Proposal #3237 Mid−infrared properties, excitation mechanisms and AGN content of LINERs −− An IRS survey Principal Investigator: Eckhard Sturm Institution: Max−Planck−Institute for Extraterrestrial Physics Technical Contact: Eckhard Sturm, MPE Co−Investigators: Sylvain Veilleux, UMD Reinhard Genzel, MPE and UCB Dieter Lutz, MPE Alessandra Contursi, MPE Matt Lehnert, MPE Linda Tacconi, MPE Dave Sanders, IfA Steve Lord, IPAC Joe Mazzarella, IPAC Amiel Sternberg, TAU Dan Maoz, TAU Science Category: AGN/quasars/radio galaxies Observing Modes: IrsStare Hours Approved: 37.9 Abstract: Low−Ionization Nuclear Emission−Line Region galaxies (LINERs) are a constituent in a major fraction of large galaxies, but their nature and their relation to AGN is still a puzzle. We propose to perform low and high resolution IRS spectroscopy of a medium−sized sample (37 objects) of nearby LINERs. In recent years, we have developed and refined spectroscopic mid−IR diagnostic tools based on ISO data and analysis. We will apply these tools to a sample consisting of both classical nuclear LINERs and extended, non−nuclear LINERs, in order to study the roles played by star formation, AGN, and shocks (interaction−driven or wind−driven) in exciting the gas. This will provide new clues as to which LINERs are AGN powered, and how these AGN LINERs differ from more luminous Seyfert galaxies. The fraction of LINERs that is AGN−powered, and the accretion mode in these low−luminosity objects, are important for a number of major issues in extragalactic astronomy, including the contribution of AGNs to the cosmic infrared background, the growth history of central black holes, and the relation of central accreting black holes to galaxy formation and evolution. We will also search for differences in the mid−infrared spectra of nuclear and non−nuclear LINERs in nearby galaxies. In higher redshift galaxies, non−nuclear LINER emission may be more important than locally because of the greater frequency of galaxy interactions, but nuclear and non−nuclear LINERs will be difficult to distinguish, due to limitations in spatial resolution. Our project will therefore provide the community with a fundamental IR data set for future studies of the more distant LINER population. Spitzer_Approved_Extragalactic Printed_by_SSC Mar 25, 10 16:24 Page 552/742 Spitzer Space Telescope − General Observer Proposal #30222 70 Micron MIPS and Chandra ACIS−I Imaging of the IRAC Dark Field: Infrared AGN Principal Investigator: Jason Surace Institution: Spitzer Science Center Technical Contact: Jason Surace, Spitzer Science Center Co−Investigators: David Frayer, Spitzer Science Center/Caltech Mark Lacy, Spitzer Science Center/Caltech Matthew Ashby, Harvard Smithsonian Center for Astrophysics Lin Yan, Spitzer Science Center/Caltech Science Category: AGN/quasars/radio galaxies Observing Modes: MipsPhot Hours Approved: 25.5 Abstract: Using data taken for the calibration the Infrared Array Camera on−board Spitzer, we have been able to discover a population of objects with mid−infrared variability on months−timescales and whose colors are characteristic of active galactic nuclei (AGN) at significantly high redshift. We request 25.5 hours of imaging at 70 microns with MIPS and 100 ksec of x−ray imaging with ACIS of the IRAC Dark Field. The 70 micron data are needed to provide a photometric data point near the peak of the spectral energy distribution, allowing an accurate determination of the spectral shape and bolometric luminosity. These are known to correlate locally with the nature of the energy source and will help provide a discriminant between AGN−like and starburst−like systems. The x−ray imaging provides an additional measure of the strength of AGN activity and the degree of obscuration to the energy source. This is an extragalactic field 15 arcminutes in diameter near the north ecliptic pole, and is the dark current calibration target for IRAC. Because it is observed frequently as part of routine operations, the field is now similar in size and depth to the infrared component of the GOODS program, and is confusion−limited in the mid−infrared. More importantly, due to the periodicity of the observations, the Spitzer data are sensitive to variability on week timescales, ultimately spanning a baseline of five to seven years. This cannot be achieved with an ordinary science GO program, and this is the only mid−infrared dataset that will have this capability at this depth for the foreseeable future. In the past year we have acquired deep multiband optical and near−IR imaging from the ground, and will soon acquire deep high spatial resolution HST imaging. All HST/Spitzer data in the field is publicly available, and the requested MIPS and Chandra data will add to this unique dataset. Thursday March 25, 2010 xgal_covers.txt 276/371
Spitzer_Approved_Extragalactic Mar 25, 10 16:24 Page 553/742 Spitzer Space Telescope − Archive Research Proposal #30390 Mid−Infrared Variability from AGN in the IRAC Dark Field: Photometric Refinement, Discovery, and Characterization Principal Investigator: Jason Surace Institution: Spitzer Science Center Technical Contact: Jason Surace, Spitzer Science Center Co−Investigators: Varoujan Gorjian, JPL Mark Lacy, Spitzer Science Center/Caltech Lin Yan, Spitzer Science Center/Caltech Science Category: AGN/quasars/radio galaxies Dollars Approved: 46910.0 Abstract: We request archival funding to support an investigation into the mid−infrared variability of AGN discovered in the IRAC Dark Field. The requested funding is needed to refine the photometric accuracy of the IRAC calibration as a function of both array position and time, allowing detection of much smaller effects than could be achieved from the SSC pipeline data products. As part of this we propose to use more sophisticated search techniques to expand the range of detectable variability to smaller amplitudes and timescales than we have already found. This may also uncover supernova signatures and other periodic variations. The field itself is an extragalactic field 15 arcminutes in diameter near the north ecliptic pole, and is the dark current calibration target for IRAC. Because it is observed frequently as part of routine operations, it is now similar in size and depth to the infrared component of the GOODS program, and is confusion−limited in the mid−infrared. More importantly, due to the periodicity of the observations, the Spitzer data are sensitive to variability on week timescales, ultimately spanning a baseline of five to seven years, and are the only mid−infrared dataset that will have this capability at this depth for the foreseeable future. This work will have a significant impact on other studies both by producing a comprehensive look at variability in deep mid−IR surveys, and also through the development of advanced data reduction techniques that can be applied to other programs for the purpose of refining IRAC’s relative photometric accuracy. Spitzer_Approved_Extragalactic Printed_by_SSC Mar 25, 10 16:24 Page 554/742 Spitzer Space Telescope − General Observer Proposal #20233 The dominant heating mechanism for the cool dust in luminous AGN: deep MIPS photometry of a complete sample of 2Jy radio sources Principal Investigator: Clive Tadhunter Institution: University of Sheffield Technical Contact: Clive Tadhunter, University of Sheffield Co−Investigators: Raffaella Morganti, ASTRON Peter Barthel, University of Groningen Katherine Inskip, University of Sheffield Ilse van Bemmel, ESA/ST−ScI David Axon, Rochester Institute of Technology Rosa Gonzalez−Delgado, Instituto d’Astrofisica d’Andalucia Joanna Holt, University of Sheffield Javier Rodriguez Zaurin, University of Sheffield Science Category: AGN/quasars/radio galaxies Observing Modes: MipsPhot Hours Approved: 33.6 Abstract: Given its general importance for studies of star formation at all redshifts, the issue of the heating mechanism for the warm/cool dust in luminous AGN is one of the key problems in extragalactic astrophysics. We propose to address this issue by using the unique high sensitivity capability of the Spitzer to make a mid− to far−IR (MFIR) photometric survey of a complete sample of luminous 2Jy radio galaxies and radio−loud quasars at intermediate redshifts. Radio−loud AGN are ideal for a study of this type, because they have relatively clean selection criteria and it is possible to determine the luminosity, orientation and age of the AGN using the emission line and radio properties of the sources. Moreover, an important advantage of the 2Jy sample is that, unlike any other major sample of powerful radio sources, deep optical spectra exist for all the sample objects. These spectra provide both accurate emission line luminosities and information about the stellar populations −− crucial for investigating the link between starbursts and the MFIR properties. By correlating the MFIR, radio and optical properties of the objects in the sample we will determine: (a) the dominant heating mechanism for the dust at different MFIR wavelengths; (b) the extent to which the far−IR colours depend on orientation to the line of sight; and (c) the evolution of the far−IR properties with the ages of the radio sources. This will be the first deep MFIR survey of a substantial sample of luminous AGN for which complete information on the stellar populations, AGN and jet properties already exists. Thursday March 25, 2010 xgal_covers.txt 277/371
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Extragalactic abstracts - IRSA - California Institute of Technology

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