Extragalactic abstracts - IRSA - California Institute of Technology

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Spitzer_Approved_Extragalactic Mar 25, 10 16:24 Page 451/742 Spitzer Space Telescope − General Observer Proposal #50763 Testing the Unified Model with a Complete Sample of Hard X−ray Selected AGN Principal Investigator: William Forman Institution: Smithsonian Astrophysical Observatory Technical Contact: William Forman, Harvard−SAO Co−Investigators: Christine Jones, SAO Varoujan Gorjian, JPL Andrew Fabian, IOA Michael Werner, JPL Ryan Hickox, SAO Sergey Sazonov, MPA Eugene Churazov, MPA/IKI Steve Willner, SAO Jiasheng Huang, SAO Qiusheng Gu, Nanjing University Science Category: AGN/quasars/radio galaxies Observing Modes: IracMap IrsMap MipsPhot Hours Approved: 13.0 Abstract: The hard X−ray (17−60 keV) INTEGRAL survey provides, for the first time, a nearly unbiased, complete sample of 69 emission line AGN selected directly by their accretion luminosity almost unaffected by absorption. By combining the hard X−ray selection with infrared observations of the re−radiated emission that originates in the geometrically thick torus, we can probe the physics of the re−radiation and the structure of the torus by investigating the details of the correlation between X−ray and mid−IR luminosities. New IRS, IRAC, and MIPS observations, combined with Spitzer archival data, will yield a complete data set for all 69 INTEGRAL AGN. With this sample, we will test the unified model by comparing the 17−60 keV band luminosity with that of the mid−infrared (MIR), test the Spitzer IR color−color selection of AGN using an unbiased X−ray selected AGN sample, test the optical R−band −− MIR separation of absorbed and unabsorbed AGNs, study the relation between silicate emission/absorption and AGN X−ray properties including luminosity and absorption, and derive a ‘‘representative’’ SED (and dispersion) for AGN of modest luminosity suitable for use beyond the local universe. Because our sample has well−defined statistical properties, we will measure the total energy release by AGNs (except for the contribution of extremely Compton thick sources) and therefore the total growth rate of supermassive black holes in the local Universe. Spitzer_Approved_Extragalactic Printed_by_SSC Mar 25, 10 16:24 Page 452/742 Spitzer Space Telescope − Directors Discretionary Time Proposal #1097 Measuring the Far Infrared Spectral Energy Distributions of a Complete Sample of Broad Absorption Line Quasars Principal Investigator: Sarah Gallagher Institution: UCLA Technical Contact: Sarah Gallagher, UCLA Science Category: AGN/quasars/radio galaxies Observing Modes: MipsPhot Hours Approved: 12.8 Abstract: Is the Broad Absorption Line (BAL) Quasar phenomenon an effect of evolution or orientation? The answer has significant implications for understanding the connection between the growth of supermassive black holes and their host galaxies; BAL outflows are likely to be an important mechanism for regulating black hole accretion. To address this issue, this program will measure the far infrared spectral energy distributions of a complete sample of BAL quasars drawn from the Large Bright Quasar Survey. These data, in conjunction with information from other wavelength regimes, are crucial for accurately constraining the star formation rates, bolometric luminosities, and accretion rates in BAL quasars. Comparing these fundamental physical properties to those of non−BAL quasars will enable a full investigation into the evolution versus orientation explanation for the BAL wind. Thursday March 25, 2010 xgal_covers.txt 226/371
Spitzer_Approved_Extragalactic Mar 25, 10 16:24 Page 453/742 Spitzer Space Telescope − Theoretical Research Proposal #30086 Illuminating the Dusty Wind: 3D Modeling of Quasar Silicate Emission Principal Investigator: Sarah Gallagher Institution: UCLA Technical Contact: Sarah Gallagher, UCLA Co−Investigators: John Everett, Canadian Institute for Theoretical Astrophysics Dean Hines, Space Science Institute Science Category: AGN/quasars/radio galaxies Dollars Approved: 70729.0 Abstract: The so−called ‘dusty torus’, an obscuring medium surrounding the black hole accretion disk, is an essential component of the Unified Model for Active Galactic Nuclei (AGNs) invoked to explain the diversity of AGN phenomenology. One promising source for the dusty torus is a dynamical wind from the accretion disk driven by both magnetic and radiative forces. At large (> 1 pc) radii in the wind, dust is not sublimated by the central continuum and will survive in the outflow. Such a model can naturally account for the large covering factor of the obscuring medium, which is otherwise difficult to explain. We propose to explore and constrain the geometry and dynamics of obscuration in quasars (the most luminous AGNs) by building dynamical and 3D Monte Carlo radiative transfer models of such dusty outflows. By testing simulated spectra from our models directly against silicate emission features in Spitzer IRS data of quasars known to host outflows (those with broad absorption lines), we will investigate the physics of the obscuring medium in this population. We plan to explore the parameter space of inputs such as continuum luminosity, spectral energy distribution, column density, and grain properties to determine what drives the observed trends in silicate emission; a library of simulated spectra will be provided to the community. Finally, these models will enable us to measure the mass outflow rate in these winds, an essential parameter for determining the kinetic luminosities of quasar winds, and thus their impact on their host galaxies. Spitzer_Approved_Extragalactic Printed_by_SSC Mar 25, 10 16:24 Page 454/742 Spitzer Space Telescope − General Observer Proposal #3421 Dust in the Wind: Mid−Infrared Spectroscopy of Broad Absorption Line Quasars Principal Investigator: Sarah Gallagher Institution: UCLA Technical Contact: Sarah Gallagher, UCLA Co−Investigators: Francisca Kemper, UCLA Dean Hines, Space Science Institute Michael Brotherton, University of Wyoming Science Category: AGN/quasars/radio galaxies Observing Modes: IrsStare Hours Approved: 7.6 Abstract: We propose to obtain high signal−to−noise ratio spectra of an exploratory sample of mid−infrared bright Broad Absorption Line (BAL) quasars. Though small in number, our carefully selected sample of 8 BAL quasars includes objects covering a wide range of BAL properties including outflow velocities and absorption depths with examples of both high and low ionization absorption. Furthermore, the objects have a wide range of UV continuum slopes allowing us to more directly assess the correlation of mid−infrared properties with the intrinsic ionizing continuum. Our proposed observations will enable us to constrain the overall dust content and distribution around the nucleus as well as more detailed constraints on the dust content within and along the line−of−sight to the wind. In particular, the details of the 9.7 micron silicate feature will constrain the opacity, grain size, and crystalline fraction of the dust. Combined with the larger photometric surveys being conducted by the Spitzer GTO teams, our detailed investigation will provide the first comprehensive picture of the dusty structures in BAL quasars. These results can then be compared directly with similar structures inferred in non−BAL quasars, further elucidating the nature of quasars and accretion−driven power in general. Thursday March 25, 2010 xgal_covers.txt 227/371
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