Extragalactic abstracts - IRSA - California Institute of Technology

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Spitzer_Approved_Extragalactic Mar 25, 10 16:24 Page 515/742 Spitzer Space Telescope − Guaranteed Time Observer Proposal #59 Starburst Activity in Nearby Galaxies Principal Investigator: George Rieke Institution: The University of Arizona Technical Contact: Chad Engelbracht, The University of Arizona Science Category: AGN/quasars/radio galaxies Observing Modes: IracMap IrsMap IrsStare MipsPhot MipsScan Hours Approved: 45.3 Abstract: This program combines MIPS and IRAC imaging and MIPS and IRS spectroscopy (where available) of a sample of nearby starburst galaxies, over a range of metallicity and luminosity that includes the lowest metallicity galaxies known. These galaxies are near enough that groundbased support data already exist for many of them and they are bright enough that observing them does not take much time (except for the lowest metallicity galaxies). These data will be combined with new groundbased data and data from the literature to constrain a suite of starburst models. The models will provide the age and intensity of the burst that is consistent with the observations over a broad range of wavelengths and could be used to predict the subsequent evolution of the galaxy properties. Furthermore, this extremely detailed study of a small sample of starburst galaxies would provide the insight required to interpret observations of more distant galaxies (such as in the cosmological surveys) where we may only have a few photometric data points. Spitzer_Approved_Extragalactic Printed_by_SSC Mar 25, 10 16:24 Page 516/742 Spitzer Space Telescope − Guaranteed Time Observer Proposal #61 Intrinsic Spectra of Hyperluminous Infrared Galaxies Principal Investigator: George Rieke Institution: The University of Arizona Technical Contact: Dean Hines, Space Science Institute Science Category: AGN/quasars/radio galaxies Observing Modes: IrsStare Hours Approved: 8.2 Abstract: We will use the low and high spectral resolution capabilities of the IRS aboard SIRTF to obtain high signal−to−noise mid−infrared spectra of a small sample of the most luminous Active Galactic Nuclei, which are characterized by their "warm" far−infrared spectral energy distributions as obtained by IRAS (the so called Hyperluminous Infrared Galaxies or HIGs). The sample consists of both Type 2 and Type 1 AGNs. The Type 1 objects present a relatively unobscured view of the central engine, and also have a polarized (scattered) component that is completely unobscured. The Type 2 objects have Type 1 polarized spectra, but this scattered light is highly extinguished indicating some obscuration even along the line of sight to the scattering region. The sample will allow us to compare the properties of the Type 1s and Type 2s, thus providing a check on the orientation and providing strong constraints on the geometry and internal structure of all four objects. Thursday March 25, 2010 xgal_covers.txt 258/371
Spitzer_Approved_Extragalactic Mar 25, 10 16:24 Page 517/742 Spitzer Space Telescope − Guaranteed Time Observer Proposal #82 The Far−IR Spectral Energy Distributions of Luminous Active Galactic Nuclei Principal Investigator: George Rieke Institution: The University of Arizona Technical Contact: Dean Hines, Space Science Institute Science Category: AGN/quasars/radio galaxies Observing Modes: IracMap IrsStare MipsPhot MipsSed Hours Approved: 88.2 Abstract: The Far−IR Spectral Energy Distributions of Luminous Active Galactic NucleiHines, G.Rieke, Neugebauer, LowBy obtaining accurate photometry in the three MIPS bands, we will address the relationship between different forms of luminous AGNs, the evolution of AGN properties with redshift, and which physical processes regulate the energy outputs. In particular, unification schemes posit that various types of AGN (e.g., QSO vs. Hyperluminous Infrared Galaxy) are fundamentally similar in nature, but appear to have diverse properties because they are viewed at different angles. These aspect angles accentuate or de−emphasize emission at various wavelengths and from various regions near the central engine. We concentrate on sub−sets of the most luminous 10−20 objects each drawn from complete catalogs with z
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Extragalactic abstracts - IRSA - California Institute of Technology

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