Extragalactic abstracts - IRSA - California Institute of Technology

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Spitzer_Approved_Extragalactic Mar 25, 10 16:24 Page 411/742 Spitzer Space Telescope − General Observer Proposal #40553 Cadenced IRAC Monitoring of Infrared−Variable AGNs Principal Investigator: Matthew Ashby Institution: Harvard−Smithsonian Astrophysical Observatory Technical Contact: Matthew Ashby, Harvard−SAO Co−Investigators: Joseph Hora, Harvard−Smithsonian Astrophysical Observatory Jason Surace, Spitzer Science Center/CalTech Howard Smith, Harvard−Smithsonian Astrophysical Observatory Jessica Krick, Spitzer Science Center/CalTech Science Category: AGN/quasars/radio galaxies Observing Modes: IracMap Hours Approved: 10.0 Abstract: We have analyzed IRAC imaging data from 87 Spitzer visits to a very well−studied field, the IRAC Dark Calibration Field (IRAC−CF) near the north ecliptic pole. With this extensive dataset we have already identified a unique sample of 40 infrared−variable galaxies which we are now working to characterize with respect to variability amplitudes and timescales, panchromatic SEDs, and host morphologies, among other quantities. Unfortunately, we have found that the continual change in the spacecraft roll angle means that our sources are typically observed for at most six months at a time by each IRAC FOV in succession −− in other words, the visibility windows are exactly out of phase. Thus the existing data, despite the fact that they extend over more than three years starting in 2003 December, present large, unavoidable gaps that frustrate the time−delay analysis we wish to perform on exactly the timescales known to be common in active galaxies. Such an analysis, especially for a sizable, unbiased sample such as we now have, holds unique promise for measuring the colors and temperatures of infrared−varying AGN, and will have much to say about the underlying physical models of the infrared AGN emission. Accordingly we ask for just 10 h to gather IRAC photometry in the gaps that would otherwise accrue in Cycle 4. Spitzer_Approved_Extragalactic Printed_by_SSC Mar 25, 10 16:24 Page 412/742 Spitzer Space Telescope − General Observer Proposal #50201 Cadenced IRAC Monitoring of Infrared−Variable AGNs, Part II Principal Investigator: Matthew Ashby Institution: Harvard−Smithsonian Astrophysical Observatory Technical Contact: Matthew Ashby, Harvard−SAO Co−Investigators: Joseph Hora, Harvard−Smithsonian CfA Morgan Fouesneau, University of Strasbourg, France Jessica Krick, Spitzer Science Center/CalTech Jason Surace, Spitzer Science Center/CalTech Howard Smith, Harvard−Smithsonian CfA Science Category: AGN/quasars/radio galaxies Observing Modes: IracMap Hours Approved: 8.0 Abstract: We have analyzed IRAC imaging data from all 97 Spitzer visits to a very well−studied field, the IRAC Dark Calibration Field (IRAC−CF) near the north ecliptic pole. With this extensive dataset we have already identified a unique sample of 30 IR−variable galaxies which we are now working to characterize with respect to variability amplitudes and timescales, panchromatic SEDs, and host morphologies, among other quantities. Unfortunately, the continual change in spacecraft roll angle means that our sources are typically observed for at most six months at a time by each IRAC FOV in succession −− in other words, the visibility windows are exactly out of phase. Thus the existing data, despite the fact that they extend over more than four years, present large, unavoidable gaps that frustrate the time−delay analysis we wish to perform on exactly the timescales known to be common in active galaxies. This has only changed beginning in 2007 July: since that time cadenced IRAC observations have been carried out in synchrony with the IRAC−CF dark−calibration observations as part of our approved Cycle−4 program (PID 40553). Here we are proposing to continue this successful AGN monitoring campaign until the end of the cryogenic mission. The resulting timelines (covering 1500 days thus far and expected to run ultimately to some 2200+ days), will be a unique legacy of the Spitzer mission. This dataset, especially for the sizable, unbiased AGN sample we now have, holds unique promise for measuring the colors and temperatures of IR−varying AGN, and will have much to say about the underlying physical models of the infrared AGN emission. Accordingly we ask for just 8 h to gather IRAC photometry in the temporal gaps that would otherwise accrue in Cycle 5. Thursday March 25, 2010 xgal_covers.txt 206/371
Spitzer_Approved_Extragalactic Mar 25, 10 16:24 Page 413/742 Spitzer Space Telescope − General Observer Proposal #30119 Infrared Emission from the Smallest Active Galaxies Principal Investigator: Aaron Barth Institution: University of California, Irvine Technical Contact: Aaron Barth, University of California, Irvine Co−Investigators: Jenny Greene, Harvard−Smithsonian Center for Astrophysics Luis Ho, Observatories of the Carnegie Institution of Washi Science Category: AGN/quasars/radio galaxies Observing Modes: IrsStare Hours Approved: 26.1 Abstract: Virtually all of our current knowledge of black hole demographics, both in nearby inactive galaxies and in AGNs, comes from observations of black holes with masses between a few million and a few billion solar masses in host galaxies with stellar velocity dispersions between about 70 and 400 km/sec. Searching for smaller black holes in low−mass galaxies can yield important clues to the origin and early evolution of supermassive black holes, and AGN surveys are the best available way to identify such objects. Using the Sloan Digital Sky Survey, we have identified 19 Seyfert 1 galaxies with black hole mass below 10^6 solar masses (Greene & Ho 2004), and 20 Seyfert 2 galaxies having stellar velocity dispersions smaller than 70 km/sec as determined by new Keck observations. These AGN samples offer a unique opportunity to study the very early growth stages of black holes and their host galaxies. Spitzer observations of mid−infrared emission will be the best available calorimeter of the energetics of these tiny AGNs. Our primary goal is to determine the infrared contribution to the bolometric luminosities, which will be a key to understanding the black hole accretion rates. From the infrared spectral shapes we will constrain the dust temperatures and search for silicate features in emission or absorption that may indicate the presence of an obscuring torus, and which will help to determine whether the Type 1 and Type 2 objects differ primarily as a result of our viewing angle, as in classic AGN unified models. PAH features and narrow emission lines will be used to diagnose the relative contributions of AGN and star formation to the infrared luminosity. To accomplish these goals, we request IRS staring−mode spectroscopy in the SL2, SL1, LL2, and LL1 settings for our Sloan−selected sample of 19 Seyfert 1s and 20 Seyfert 2s, as well as NGC 4395 and POX 52, which are the prototypical nearby examples of Seyfert nuclei in dwarf host galaxies. Spitzer_Approved_Extragalactic Printed_by_SSC Mar 25, 10 16:24 Page 414/742 Spitzer Space Telescope − General Observer Proposal #20719 IRS Spectroscopy of 3CR Radio Galaxies Principal Investigator: Stefi Baum Institution: Rochester Institute of Technology Technical Contact: Stefi Baum, Rochester Institute of Technology Co−Investigators: Catherine Buchanan, Rochester Institute of Technology Christopher O’Dea, Rochester Institute of Technology David Axon, Rochester Institute of Technology Jack Gallimore, Bucknell University Andrew Robinson, Rochester Institute of Technology William Sparks, Space Telescope Science Institute Eric Perlman, University of Maryland, Baltimore County Alice Quillen, University of Rochester David Floyd, Space Telescope Science Institute Science Category: AGN/quasars/radio galaxies Observing Modes: IrsMap Hours Approved: 17.0 Abstract: Radio galaxies are among the largest and most powerful objects in the universe and, due to their interaction with their environment, are excellent objects to study the role of nuclear activity in galaxy evolution. However the interaction between radio−emitting active nuclei and their host galaxies on parsec scales is poorly understood. This is complicated by our lack of understanding of the relation between different classes of radio galaxy, defined by radio and optical properties. We propose to obtain IRS spectra of a sample of nearby radio galaxies in order to address fundamental questions about the nature of radio galaxies and their interaction with their environment. Low−resolution spectral maps of the central few kiloparsecs of these galaxies will enable us to probe the dusty central regions surrounding the active nucleus in these objects and to compare the classes of FRI and FRII radio galaxies. The IRS observations proposed here will be used along with archival IRAC and MIPS photometry to model the mid− to far−infrared spectral energy distributions (SEDs) of nearby radio galaxies. These SEDs will be compared with the IR SEDs of radio−quiet Seyfert galaxies, being obtained in a current Spitzer program, in order to understand how the interaction between an active nucleus and its host galaxy scales with host type, mass, and luminosity, black hole mass, and radio power. Thursday March 25, 2010 xgal_covers.txt 207/371
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Extragalactic abstracts - IRSA - California Institute of Technology

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