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  1. OA@INAF
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  3. 1 CONTRIBUTI IN RIVISTE (Journal articles)
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Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12386/28572
Title: X-Ray Observations of a z ∼ 6.2 Quasar/Galaxy Merger
Authors: Connor, Thomas
Bañados, Eduardo
Stern, Daniel
DECARLI, ROBERTO 
Schindler, Jan-Torge
Fan, Xiaohui
Farina, Emanuele Paolo
Mazzucchelli, Chiara
Mulchaey, John S.
Walter, Fabian
Issue Date: 2019
Journal: THE ASTROPHYSICAL JOURNAL 
Number: 887
Issue: 2
First Page: 171
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}<SUB>-8.6</SUB><SUP>+9.6</SUP> net counts, we find that PSO J308.0416-21.2339 is powerful ({L}<SUB>X</SUB>={2.31}<SUB>-0.76</SUB><SUP>+1.14</SUP>× {10}<SUP>45</SUP> {erg} {{{s}}}<SUP>-1</SUP> {cm}}<SUP>-2</SUP> in rest-frame 2.0-10.0 keV) yet soft (spectral power-law index {{Γ }}={2.39}<SUB>-0.36</SUB><SUP>+0.37</SUP> and optical-to-X-ray slope α <SUB>OX</SUB> = -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.
URI: http://hdl.handle.net/20.500.12386/28572
URL: https://iopscience.iop.org/article/10.3847/1538-4357/ab5585
ISSN: 0004-637X
DOI: 10.3847/1538-4357/ab5585
Bibcode ADS: 2019ApJ...887..171C
Fulltext: open
Appears in Collections:1.01 Articoli in rivista

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