Extragalactic abstracts - IRSA - California Institute of Technology

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Spitzer_Approved_Extragalactic Mar 25, 10 16:24 Page 499/742 Spitzer Space Telescope − General Observer Proposal #30779 Contribution of Dust Emission to the Spectral Energy Distribution of Gamma−Ray Bright Blazars Principal Investigator: Alan Marscher Institution: Institute for Astrophysical Research Technical Contact: Alan Marscher, Institute for Astrophysical Research Co−Investigators: Svetlana Jorstad, Institute for Astrophysical Research, BU USA Science Category: AGN/quasars/radio galaxies Observing Modes: IracMap IrsStare MipsPhot Hours Approved: 12.3 Abstract: A number of blazars have very high gamma−ray to IR apparent luminosity ratios, in some cases exceeding 100. While this might be the result of extreme relativistic beaming of inverse−Compton scattered radiation, the success of this model relies on the presence of a compact torus of hot dust surrounding the central engine. We propose to observe four gamma−ray bright blazars with MIPS, IRS, and IRAC in order to measure the spectral energy distribution in an effort to reveal thermal emission components from dust tori. Because the IR continuum is variable, we need two complete sets of SST observations, one in each of two visibility periods, in order to measure and subtract the time−variable, nonthermal component using an established procedure. Further subtraction of a quasi−steady synchrotron component, if present, will reveal the presence of graybody humps or silicate emission features corresponding to hot or cool dust. Spitzer_Approved_Extragalactic Printed_by_SSC Mar 25, 10 16:24 Page 500/742 Spitzer Space Telescope − Archive Research Proposal #3205 Resolution−Enhanced (HiRes) Imaging of the FLS Galactic and Extragalactic Components Principal Investigator: Kenneth Marsh Institution: Jet Propulsion Laboratory Technical Contact: Kenneth Marsh, Jet Propulsion Laboratory Co−Investigators: Thangasamy Velusamy, Jet Propulsion Laboratory Chas Beichman, Jet Propulsion Laboratory David Frayer, Jet Propulsion Laboratory Peter Martin, Jet Propulsion Laboratory George Rieke, University of Arizona Daniel Stern, Jet Propulsion Laboratory Science Category: AGN/quasars/radio galaxies Dollars Approved: 115000.0 Abstract: We propose to process all of the galactic and extragalactic images of the First Look Survey (FLS) using the ‘‘HiRes" resolution−enhancement procedure, which will increase the spatial resolution of Spizer data by a factor of between two and three over that obtainable in a standard mosaiced image. The product of this effort will be a catalog of mosaiced and resolution−enhanced images, to be released to the astronomical community at the earliest possible date. The release will include the HiRes software tool itself. As an additional task, we will undertake an analysis of the resolution−enhanced image set in order to evaluate statistically the spatial and spectral properties of the confusion in the various representative regions, and extract physical information from spatially resolved sources which will include circumstellar disks and prestellar cores. The value of HiRes for optimizing the resolution of survey data has been proven in the case of IRAS, as a result of which the scientific return of that survey was greatly increased. Similar rewards will result from its application to Spitzer data, and in particular, it will strengthen the stated goals of the FLS. We request $125K for this effort. Thursday March 25, 2010 xgal_covers.txt 250/371
Spitzer_Approved_Extragalactic Mar 25, 10 16:24 Page 501/742 Spitzer Space Telescope − General Observer Proposal #30634 Two Types of Type−2? Principal Investigator: Alejo Martinez−Sansigre Institution: Oxford University Technical Contact: Alejo Martinez−Sansigre, Oxford University Co−Investigators: Steve Rawlings, Oxford University Lacy Mark, Spitzer Science Center Chris Simpson, Durham University Chris Willott, Herzerg Institure of Astrophysics Jarvis Matt, Oxford University Francine Marleau, Spitzer Science Center Dario Fadda, Spitzer Science Center Science Category: AGN/quasars/radio galaxies Observing Modes: IrsStare Hours Approved: 22.8 Abstract: We propose to use the Spitzer IRS instrument to test the hypothesis that there are two distinct types of Type−2 (obscured) QSO: the first in which the nucleus is obscured at optical wavelengths by an organized torus; and the second, in which the nucleus is obscured by more distributed dust in an associated starburst. We will target a complete sample of Type−2 QSOs at z = 1.4−2 from the Spitzer First−Look Survey which, from optical spectroscopy, split into objects with high excitation, narrow−emission lines (torus−obscured QSOs?) and objects with totally blank optical spectra (starburst−obscured QSOs?). The IRS spectra will be sensitive to the the ‘Silicate Break’ (and PAH features) and therefore identify and provide redshifts for any starburst−obscured QSOs, whereas QSOs in which there is a clear view of hot dust in the torus, will have relatively featureless mid−IR spectra, except for the silicate absorption feature. Spitzer_Approved_Extragalactic Printed_by_SSC Mar 25, 10 16:24 Page 502/742 Spitzer Space Telescope − General Observer Proposal #40517 Infrared SEDs and dust emission from z > 5 quasars. Part I. Probing the hottest dust with Spitzer. Principal Investigator: Klaus Meisenheimer Institution: Max−Planck−Institut fuer Astronomie Technical Contact: Helmut Dannerbauer, Max−Planck−Institut fuer Astronomie Co−Investigators: Helmut Dannerbauer, MPIA Fabian Walter, MPIA Xiaohui Fan, University of Arizona Linhua Jiang, University of Arizona Oliver Krause, MPIA Ulrich Klaas, MPIA Science Category: AGN/quasars/radio galaxies Observing Modes: IracMap MipsPhot Hours Approved: 71.1 Abstract: As part of a comprehensive multi−wavelength project to determine the Spectral Energy Distributions (SEDs) of all known quasars at z > 5, we propose Spitzer photometry in the four IRAC bands and the MIPS 24 um band. These observations are the necessary short wavelengths complement to our Herschel guaranteed time Key Project, which will measure the Far−IR SED of 77 quasars at z > 5 in the range 70 to 170 um (PACS) and 240 to 520 um (SPIRE). In addition, our target list contains 17 radio−loud quasars and galaxies at z > 3.5. The combined Spitzer plus Herschel photometry will characterize the overall Mid− to Far−infrared SEDs of a large sample of quasars at the highest redshifts in great detail and thus provide a data base of huge legacy value. We selected all those targets for this Spitzer proposal for which IRAC and MIPS photometry are neither observed nor scheduled. The proposed observations will cover rest−frame wavelengths between 0.5 and 4 um which will allow us to detect the hottest dust as an excess of the measured 24 um flux (above the UV−optical continuum as derived from the IRAC bands and NIR photometry). Our observations will enlarge the present samples of z > 5 quasars with Mid−IR photometry by a factor of 4. This will allow us to determine the frequency of peculiar (dust−free ?) objects detected in previous studies and to carry out statistical investigations of the relation between UV−optical spectrum from the accretion disk and the emission from the hottest part of the dust torus. Thursday March 25, 2010 xgal_covers.txt 251/371
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