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dc.contributor.authorConnor, Thomas
dc.contributor.authorBañados, Eduardo
dc.contributor.authorStern, Daniel
dc.contributor.authorDecarli, Roberto
dc.contributor.authorSchindler, Jan-Torge
dc.contributor.authorFan, Xiaohui
dc.contributor.authorFarina, Emanuele Paolo
dc.contributor.authorMazzucchelli, Chiara
dc.contributor.authorMulchaey, John S.
dc.contributor.authorWalter, Fabian
dc.date.accessioned2020-02-04T19:06:32Z
dc.date.available2020-02-04T19:06:32Z
dc.date.issued2019-12-18
dc.identifier.citationThomas Connor et al 2019 ApJ 887 171en_US
dc.identifier.issn0004-637X
dc.identifier.doi10.3847/1538-4357/ab5585
dc.identifier.urihttp://hdl.handle.net/10150/636902
dc.description.abstractQuasars 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.en_US
dc.description.sponsorshipSTSCI/NASAen_US
dc.language.isoenen_US
dc.publisherIOP PUBLISHING LTDen_US
dc.rightsCopyright © 2019. The American Astronomical Society. All rights reserved.en_US
dc.rights.urihttp://iopscience.iop.org/info/page/text-and-data-mining
dc.titleX-Ray Observations of a z ∼ 6.2 Quasar/Galaxy Mergeren_US
dc.typeArticleen_US
dc.contributor.departmentUniv Arizona, Steward Observen_US
dc.identifier.journalASTROPHYSICAL JOURNALen_US
dc.description.collectioninformationThis 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.en_US
dc.eprint.versionFinal published versionen_US
dc.source.journaltitleThe Astrophysical Journal
dc.source.volume887
dc.source.issue2
dc.source.beginpage171
refterms.dateFOA2020-02-04T19:06:33Z


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