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    X-Ray Observations of a z ∼ 6.2 Quasar/Galaxy Merger

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    Connor_2019_ApJ_887_171.pdf
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    Final Published Version
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    Author
    Connor, Thomas
    Bañados, Eduardo cc
    Stern, Daniel cc
    Decarli, Roberto
    Schindler, Jan-Torge
    Fan, Xiaohui
    Farina, Emanuele Paolo
    Mazzucchelli, Chiara
    Mulchaey, John S.
    Walter, Fabian cc
    Affiliation
    Univ Arizona, Steward Observ
    Issue Date
    2019-12-18
    
    Metadata
    Show full item record
    Publisher
    IOP PUBLISHING LTD
    Citation
    Thomas Connor et al 2019 ApJ 887 171
    Journal
    ASTROPHYSICAL JOURNAL
    Rights
    Copyright © 2019. 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
    Quasars at early redshifts (z > 6) with companion galaxies offer unique insights into the growth and evolution of the first supermassive black holes. Here, we report on a 150 ks Chandra observation of PSO.J308.0416-21.2339, a z = 6.23 quasar with a merging companion galaxy identified in [C II] and rest-frame UV emission. With 72.3(-8.6)(+9.6) net counts, we find that PSO.J308.0416-21.2339 is powerful (L-X = 2.31(-0.76)(+1.14) x 10(45) erg s(-1) cm(-2) in rest-frame 2.0-10.0 keV) yet soft (spectral power-law index Gamma = 2.39(-0.36)(+0.37) and optical-to-X-ray slope alpha(OX) = -1.41 +/- 0.11). In addition, we detect three hard-energy photons 2 ''.0 to the west of the main quasar, cospatial with the brightest UV emission of the merging companion. As no soft-energy photons are detected in the same area, this is potentially indicative of a highly obscured source. With conservative assumptions, and accounting for both background fluctuations and the extended wings of the quasar's emission, these photons only have a probability P = 0.021 of happening by chance. If confirmed by deeper observations, this system is the first high-redshift quasar and companion individually detected in X-rays and is likely a dual active galactic nucleus.
    ISSN
    0004-637X
    DOI
    10.3847/1538-4357/ab5585
    Version
    Final published version
    Sponsors
    STSCI/NASA
    ae974a485f413a2113503eed53cd6c53
    10.3847/1538-4357/ab5585
    Scopus Count
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    UA Faculty Publications

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