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    Dust-deficient Palomar-Green Quasars and the Diversity of AGN Intrinsic IR Emission

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    Author
    Lyu, Jianwei cc
    Rieke, George H. cc
    Shi, Yong cc
    Affiliation
    Univ Arizona, Steward Observ
    Issue Date
    2017-02-01
    Keywords
    galaxies: active
    infrared: galaxies
    quasars: general
    
    Metadata
    Show full item record
    Publisher
    IOP PUBLISHING LTD
    Citation
    Dust-deficient Palomar-Green Quasars and the Diversity of AGN Intrinsic IR Emission 2017, 835 (2):257 The Astrophysical Journal
    Journal
    The Astrophysical Journal
    Rights
    © 2017. The American Astronomical Society. All rights reserved.
    Collection Information
    This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.
    Abstract
    To elucidate the intrinsic broadband infrared (IR) emission properties of active galactic nuclei (AGNs), we analyze the spectral energy distributions (SEDs) of 87 z less than or similar to 0.5 Palomar-Green (PG) quasars. While the Elvis AGN template with a moderate far-IR correction can reasonably match the SEDs of the AGN components in similar to 60% of the sample (and is superior to alternatives such as that by Assef), it fails on two quasar populations: (1) hot-dustdeficient (HDD) quasars that show very weak emission thoroughly from the near-IR to the far-IR, and (2) warm-dust- deficient (WDD) quasars that have similar hot dust emission as normal quasars but are relatively faint in the mid-and far-IR. After building composite AGN templates for these dust-deficient quasars, we successfully fit the 0.3-500 mu m SEDs of the PG sample with the appropriate AGN template, an infrared template of a star-forming galaxy, and a host galaxy stellar template. 20 HDD and 12 WDD quasars are identified from the SED decomposition, including seven ambiguous cases. Compared with normal quasars, the HDD quasars have AGNs with relatively low Eddington ratios and the fraction of WDD quasars increases with AGN luminosity. Moreover, both the HDD and WDD quasar populations show relatively stronger mid-IR silicate emission. Virtually identical SED properties are also found in some quasars from z = 0.5 to 6. We propose a conceptual model to demonstrate that the observed dust deficiency of quasars can result from a change of structures of the circumnuclear tori that can occur at any cosmic epoch.
    ISSN
    1538-4357
    DOI
    10.3847/1538-4357/835/2/257
    Version
    Final published version
    Sponsors
    NASA [NNX13AD82G, 1255094]; National Aeronautics and Space Administration; National Science Foundation
    Additional Links
    http://stacks.iop.org/0004-637X/835/i=2/a=257?key=crossref.b1bf0f6391b402e5b312a70eec7361d8
    ae974a485f413a2113503eed53cd6c53
    10.3847/1538-4357/835/2/257
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    UA Faculty Publications

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