Extragalactic abstracts - IRSA - California Institute of Technology

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Spitzer_Approved_Extragalactic Mar 25, 10 16:24 Page 455/742 Spitzer Space Telescope − General Observer Proposal #41021 Lower Luminosity AGNs at Cosmologically Interesting Redshifts: SEDs and Accretion Rates of z~0.36 Seyferts Principal Investigator: Sarah Gallagher Institution: UCLA Technical Contact: Sarah Gallager, UCLA Co−Investigators: Tommaso Treu, UC Santa Barbara Matthew Malkan, UCLA Jong−Hak Woo, UC Santa Barbara Science Category: AGN/Quasars/Radio Galaxies Observing Modes: IracMap MipsPhot Hours Approved: 11.0 Abstract: We propose a multiwavelength campaign to constrain the SEDs of Seyferts at z~0.36. This epoch, corresponding to a look back time of 4 Gyrs, is cosmologically interesting for studies of the coeval development of black holes and their host galaxy bulges. Our sample, comprising 24 Seyferts, has unprecedented high quality Keck spectroscopy and HST imaging already invested to extract host galaxy bulge properties, estimate black hole masses, and separate nuclear and host optical luminosities. To supplement and extend this successful program, we request 93 ks of Chandra time (to measure the shape and power of the AGN−only X−ray continuum),11 hrs each of Spitzer and Gemini (to constrain the dust temperature), and 7 orbits of HST (to determine the nuclear luminosity for the final 7 objects). Spitzer_Approved_Extragalactic Printed_by_SSC Mar 25, 10 16:24 Page 456/742 Spitzer Space Telescope − General Observer Proposal #50328 Seeing the Unseen: MIR Spectroscopic Constraints on Quasar Big Blue Bumps Principal Investigator: Sarah Gallagher Institution: UCLA Technical Contact: Sarah Gallagher, UCLA Co−Investigators: Karen Leighly, University of Oklahoma Gordon Richards, Drexel University Dean Hines, Space Science Institute Patrick Ogle, Spitzer Science Center Science Category: AGN/quasars/radio galaxies Observing Modes: IrsStare IrsPeakupImage Hours Approved: 31.7 Abstract: The IRS on Spitzer offers an exciting opportunity for detailed, mid−infrared spectroscopy of z~2 quasars for the first time. This epoch, sampling the peak of the quasar luminosity evolution, is particularly important for understanding the nature of quasar activity in the most massive galaxies. We aim to use this powerful tool to constrain the shape and power of the far−ultraviolet through soft−X−ray ionizing continuum of luminous quasars. Though these so−called ‘big blue bumps’ dominate the power of quasar spectral energy distributions, they are largely unobservable as a result of hydrogen opacity in the Universe. However, we can determine the properties of the big blue bump by studying emission lines from ions in the coronal line region that emit in the mid−infrared and are created by those same energetic and elusive photons. We propose deep, high quality IRS observations of 5 luminous quasars with a range of HeII emission properties to investigate the mid−infrared spectral region in depth and constrain the shape of the ionizing continuum in each quasar. In addition, these high S/N spectra will provide templates for interpreting lower resolution, lower S/N IRS spectra. Thursday March 25, 2010 xgal_covers.txt 228/371
Spitzer_Approved_Extragalactic Mar 25, 10 16:24 Page 457/742 Spitzer Space Telescope − Directors Discretionary Time Proposal #283 Relationship Between Black Hole Mass and Their Infrared Brightness to Synchrotron Radio Emission Ratio Principal Investigator: Varoujan Gorjian Institution: JPL Technical Contact: Varoujan Gorjian, JPL Co−Investigators: Mark Hofstadter, JPL Michelle Thaller, SSC Dave Maclaren, LCER Science Category: AGN/Quasars/Radio Galaxies Observing Modes: IracMap Hours Approved: 1.2 Abstract: The objective of this proposal is to see whether there is a correlation between the central black hole masses of nearby AGN and the ratio of their radio to infrared flux. Spitzer will image the AGN in the 3.6 to 8um range and that will be compared to data gathered by the GAVRT students in the S and X radio bands. Once the data is in hand a comparison can be made of the thermal processes generating the IR and the non−thermal processes generating the radio, and whether the ratio of the thermal to the non−thermal is related to the masses of the black holes. Spitzer_Approved_Extragalactic Printed_by_SSC Mar 25, 10 16:24 Page 458/742 Spitzer Space Telescope − General Observer Proposal #30572 Probing Parsec Scale Structure of Nearby Seyferts Using Variability Principal Investigator: Varoujan Gorjian Institution: JPL Technical Contact: Varoujan Gorjian, JPL Co−Investigators: Michael Werner, JPL Science Category: AGN/quasars/radio galaxies Observing Modes: IrsStare MipsPhot Hours Approved: 19.9 Abstract: Variability is one of the most powerful tools for studying the structure of unresolved objects. To search for mid−IR AGN variability, we propose to re−observe 42 nearby Seyfert galaxies with all IRS modules and MIPS at 24 microns. The sample was originally observed as part of a GTO program and covers a wide range of X−ray determined Hydrogen column density, and because the sources are so bright, very high signal to noise data was obtained in short exposures: 60s for the low resolution IRS mode, 120s for the high resolution IRS mode, and 92 seconds for the MIPS 24 micron imaging mode. This second epoch, which spans 1 to 3 years since the original observations, should allow for variability to be detected in the silicate emission features, the dust continuum, and the gas phase emission lines. Based on models of the dusty torus, the variable mid−IR emission should be occurring on parsec and sub−parsec scales, thus giving information about the dust distribution on those scales.. Thursday March 25, 2010 xgal_covers.txt 229/371
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Extragalactic abstracts - IRSA - California Institute of Technology

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