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    X-Rays from the Redshift 7.54 Quasar ULAS J1342+0928

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    Bañados_2018_ApJL_856_L25.pdf
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    Author
    Bañados, Eduardo cc
    Connor, Thomas
    Stern, Daniel
    Mulchaey, John
    Fan, Xiaohui cc
    Decarli, R. cc
    Farina, Emanuele P.
    Mazzucchelli, C. cc
    Venemans, B. P. cc
    Walter, Fabian cc
    Wang, Feige cc
    Yang, Jinyi
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    Affiliation
    Univ Arizona, Steward Observ
    Issue Date
    2018-03-27
    Keywords
    cosmology: observations
    early universe
    quasars: individual (ULAS J134208.10+092838.61)
    
    Metadata
    Show full item record
    Publisher
    IOP PUBLISHING LTD
    Citation
    Eduardo Bañados et al 2018 ApJL 856 L25
    Journal
    ASTROPHYSICAL JOURNAL LETTERS
    Rights
    © 2018. 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
    We present a 45 ks Chandra observation of the quasar ULAS J1342+0928 at z=7.54. We detect 14.0(-3.7)(+4.8) counts from the quasar in the observed-frame energy range 0.5-7.0 keV (6 sigma detection), representing the most distant non-transient astronomical source identified in X-rays to date. The present data are sufficient only to infer rough constraints on the spectral parameters. We find an X-ray hardness ratio of HR = -0.51(-0.28)(+0.26) between the 0.5-2.0 keV and 2.0-7.0 keV ranges and derive a power-law photon index of Gamma= 1.95(-0.53)(+0.55). Assuming a typical value for high-redshift quasars of Gamma = 1.9, ULAS J1342+0928 has a 2-10 keV rest-frame X-ray luminosity of L2-10 = 11.6(-3.5)(+4.3) x 10(44) erg s(-1). Its X-ray-to-optical power-law slope is alpha(OX) = -1.67(-0.10)(+0.16), consistent with the general trend indicating that the X-ray emission in the most bolometrically powerful quasars is weaker relative to their optical emission.
    ISSN
    2041-8213
    DOI
    10.3847/2041-8213/aab61e
    Version
    Final published version
    Sponsors
    ERC
    Additional Links
    http://stacks.iop.org/2041-8205/856/i=2/a=L25?key=crossref.c101bca1f8631b517583400166e8265c
    ae974a485f413a2113503eed53cd6c53
    10.3847/2041-8213/aab61e
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    UA Faculty Publications

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