Extragalactic abstracts - IRSA - California Institute of Technology

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Spitzer_Approved_Extragalactic Mar 25, 10 16:24 Page 523/742 Spitzer Space Telescope − Guaranteed Time Observer Proposal #40385 An Unusual Type of AGN: A Challenge to the Unification Model Principal Investigator: George Rieke Institution: University of Arizona Technical Contact: Yong Shi, University of Arizona Co−Investigators: Jennifer Donley, University of Arizona Dean Hines, Space Science Institute Jane Rigby, Carnegie Observatories Paul Smith, University of Arizona Yong Shi, University of Arizona Science Category: AGN/quasars/radio galaxies Observing Modes: IracMap IrsStare MipsPhot Hours Approved: 2.1 Abstract: We propose to obtain the IR spectral energy distributions (SEDs) of a small sample of unusual AGN−−optically type 1.8/2 objects with little X−ray obscuration. Their extreme properties relative to the current unification model of AGN are our best means to refine the model and may identify exceptions that would strongly modify our overall view of the subject. There are various possibilities for the origin of this type of AGN: (1) they do not harbor broad line regions, which also implies that the torus does not exist or does not obscure our direct view of the nucleus if it is present; (2) dust survives in the broad line regions of these objects to obscure the broad line regions but not the X−rays; (3) the torus is very clumpy, permitting X−rays to pass but blocking the broad line regions. Spitzer data will test the above possibilities and provide information to improve the standard unification model. Spitzer_Approved_Extragalactic Printed_by_SSC Mar 25, 10 16:24 Page 524/742 Spitzer Space Telescope − Guaranteed Time Observer Proposal #40936 A Complete Sample of Seyfert Galaxies in the Local Universe Principal Investigator: George Rieke Institution: University of Arizona Technical Contact: Aleks Diamond−Stanic, University of Arizona Co−Investigators: Yong Shi, University of Arizona Jennifer Donley, University of Arizona Jane Rigby, Carnegie Institute Almudena Alonso−Herrero, CSIC, Spain Science Category: AGN/quasars/radio galaxies Observing Modes: IracMap IrsStare MipsPhot Hours Approved: 27.6 Abstract: We propose new Spitzer observations that will establish the infrared properties of a complete sample of Seyfert galaxies in the nearby Universe. Our sample, which includes all known B < 13.0 Seyferts in the Revised Shapley−Ames catalog, reduces biases found in other samples selected at optical/X−ray/IR wavelengths against type 2 and low−luminosity nuclei, and against AGN in edge−on host galaxies. These new observations, combined with existing archival data, will complete IRS low resolution, MIPS imaging at 24 microns, and IRAC imaging for the nuclei of the 91 Seyferts in the sample. With this data set, we will quantify on a firm statistical basis the differences between the infrared properties of type 1 and type 2 AGNs. We will also constrain the nature of the dust surrounding the central engine and identify trends as a function of luminosity and star−forming activity. The majority of these galaxy nuclei are also detected by Chandra or XMM Newton, and we plan to propose to get images of the remainder. Together with the existing optical data, it will be possible to extend this study across the electromagnetic spectrum. The sample lets us study the Seyfert phenomenon where it can best be studied − in the nearby Universe. Thursday March 25, 2010 xgal_covers.txt 262/371
Spitzer_Approved_Extragalactic Mar 25, 10 16:24 Page 525/742 Spitzer Space Telescope − Guaranteed Time Observer Proposal #50099 Mid−Infrared Variability of Radio−Loud AGN Principal Investigator: George Rieke Institution: The University of Arizona Technical Contact: Paul Smith, University of Arizona Co−Investigators: Paul Smith, University of Arizona Yong Shi, University of Arizona Jane Rigby, OCIW Dean Hines, Space Science Institute Gerry Neugebauer, University of Arizona Science Category: AGN/quasars/radio galaxies Observing Modes: MipsPhot Hours Approved: 0.2 Abstract: Initial results for our MIPS Cycle 4 GTO program to measure the flux variability of 142 low−redshift AGNs at 24 microns include the finding that radio−quiet objects are not variable at a level of >2% over a time scale of 1−3 years. Of the 30 radio−quiet objects observed so far at two epochs, none show evidence of variability despite the targets having being drawn from various optical, near−IR (2MASS), and IRAS samples. This result argues against nonthermal emission as a significant contributor to the IR flux for both types 1 and 2 radio−quiet AGN. In contrast, 11 of 27 radio−loud AGN varied by >5% in flux density at 24 microns. These objects include gamma−ray−detected flat−spectrum radio sources and Fanaroff−Riley types I and II radio galaxies. As expected, the gamma−ray detected AGN show the highest degree of variability (e.g., PKS 1510−089 was found to be more than a factor of 3 brighter two years after it was first observed with MIPS). Unexpectedly, however, little evidence for variability was found for the three X−ray selected BL Lac objects observed so far. We propose a third epoch of 24 micron flux density measurements for the radio−loud portion of the sample (57 objects). These observations will confirm marginal variability detections from the first two epochs and allow for a more robust comparison of the variability amplitudes for various classes of radio−loud AGN. Spitzer_Approved_Extragalactic Printed_by_SSC Mar 25, 10 16:24 Page 526/742 Spitzer Space Telescope − Guaranteed Time Observer Proposal #50138 X−ray Obscured Broad−Line AGN Principal Investigator: George Rieke Institution: The University of Arizona Technical Contact: Jennifer Donley, University of Arizona Co−Investigators: Yong Shi, University of Arizona Paul Smith, University of Arizona Science Category: AGN/quasars/radio galaxies Observing Modes: IracMap IrsStare MipsPhot IrsPeakupImage Hours Approved: 11.3 Abstract: While the vast majority of Type I AGN show little or no X−ray obscuration, approximately 10% are heavily obscured with X−ray column densities of N_H > 10^22 cm^−2. In addition to providing a unique and necessary test of the unified model, the study of these AGN has significant consequences for our understanding of the cosmic X−ray and infrared backgrounds, and therefore for the cosmic accretion and star−formation histories of the universe. A number of explanations have been proposed to explain the seemingly contradictory behavior of these X−ray obscured, broad−line AGN, including (1) dust sublimation near the central engine, (2) dust coagulation, (3) obscuration by clouds in the broad−line region, (4) column density variability, and (5) scattering of the broad emission lines off a reflecting medium. We therefore propose for MIPS and IRAC observations of the 11 sources in our sample of 13 for which this data is not yet available. In addition, we propose low−resolution IRS spectroscopy for the brightest 5 sources as well as 1 faint source with an exceptionally high column density, and IRS Peak−Up imaging at 16 microns for the remaining 7 sources. The MIPS, IRAC, and IRS Peak−Up photometry will allow us to test for the presence of hot dust, which may be in the process of being destroyed through dust sublimation. IRS spectroscopy will allow us to test for the presence of the 9.7 micron silicate feature, which should not be present if the dust distribution is dominated by large grains as predicted in some models, or which may be seen in emission if the broad−line region clouds are themselves responsible for the odd behavior of these AGN. In combination with polarimetric data and high−quality optical spectra from the Bok 90" telescope, these observations will provide us with the ideal dataset to test concretely for the first time the many potential explanations for the strange behavior of these unexpected AGN. Thursday March 25, 2010 xgal_covers.txt 263/371
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