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    The Accretion History of AGNs. I. Supermassive Black Hole Population Synthesis Model

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    Tasnim_Ananna_2019.pdf (2.253Mb)
    Issue Date
    2019-02-05
    Author
    Tasnim Ananna, Tonima
    Treister, Ezequiel
    Urry, C. Megan
    Ricci, C.
    Kirkpatrick, Allison
    LaMassa, Stephanie
    Buchner, Johannes
    Civano, Francesca
    Tremmel, Michael
    Marchesi, Stefano
    Publisher
    American Astronomical Society
    Type
    Article
    Article Version
    Scholarly/refereed, publisher version
    Rights
    © 2019. The American Astronomical Society. All rights reserved.
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    Abstract
    As matter accretes onto the central supermassive black holes in active galactic nuclei (AGNs), X-rays are emitted. We present a population synthesis model that accounts for the summed X-ray emission from growing black holes; modulo the efficiency of converting mass to X-rays, this is effectively a record of the accreted mass. We need this population synthesis model to reproduce observed constraints from X-ray surveys: the X-ray number counts, the observed fraction of Compton-thick AGNs [log (N H/cm−2) > 24], and the spectrum of the cosmic X-ray background (CXB), after accounting for selection biases. Over the past decade, X-ray surveys by XMM-Newton, Chandra, NuSTAR, and Swift-BAT have provided greatly improved observational constraints. We find that no existing X-ray luminosity function (XLF) consistently reproduces all these observations. We take the uncertainty in AGN spectra into account and use a neural network to compute an XLF that fits all observed constraints, including observed Compton-thick number counts and fractions. This new population synthesis model suggests that, intrinsically, 50% ± 9% (56% ± 7%) of all AGNs within z sime 0.1 (1.0) are Compton-thick.
    URI
    http://hdl.handle.net/1808/31011
    DOI
    https://doi.org/10.3847/1538-4357/aafb77
    Collections
    • Physics & Astronomy Scholarly Works [1713]
    Citation
    Tonima Tasnim Ananna et al 2019 ApJ 871 240

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    Contact KU ScholarWorks
    785-864-8983
    KU Libraries
    1425 Jayhawk Blvd
    Lawrence, KS 66045
    785-864-8983

    KU Libraries
    1425 Jayhawk Blvd
    Lawrence, KS 66045
    Image Credits
     

     

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