Статья

Enhanced X-Ray Emission from the Most Radio-powerful Quasar in the Universe’s First Billion Years

Thomas ConnorJet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109, USA; [email protected]Eduardo BañadosMax Planck Institute for Astronomy, Königstuhl 17, D-69117 Heidelberg, GermanyDaniel SternJet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109, USA; [email protected]C. L. CarilliNational Radio Astronomy Observatory, P.O. Box O, Socorro, NM 87801, USAA. C. FabianInstitute of Astronomy, Madingley Road, Cambridge CB3 0HA, UKEmmanuel MomjianNational Radio Astronomy Observatory, P.O. Box O, Socorro, NM 87801, USASofía Rojas-RuizMax Planck Institute for Astronomy, Königstuhl 17, D-69117 Heidelberg, GermanyRoberto DecarliINAF—Osservatorio di Astrofisica e Scienza dello Spazio di Bologna, via Gobetti 93/3, I-40129, Bologna, ItalyEmanuele Paolo FarinaMax Planck Institut für Astrophysik, Karl–Schwarzschild–Straße 1, D-85748, Garching bei München, GermanyChiara MazzucchelliEuropean Southern Observatory, Alonso de Cordova 3107, Vitacura, Region Metropolitana, ChileHannah P. EarnshawCahill Center for Astronomy and Astrophysics, California Institute of Technology, Pasadena, CA 91125, USA

2021en

ABI

Аннотация

Abstract We present deep (265 ks) Chandra X-ray observations of PSO J352.4034−15.3373, a quasar at z = 5.831 that, with a radio-to-optical flux ratio of R > 1000, is one of the radio-loudest quasars in the early universe and is the only quasar with observed extended radio jets of kiloparsec scale at z ≳ 6. Modeling the X-ray spectrum of the quasar with a power law, we find a best fit of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mi mathvariant="normal">Γ</mml:mi> <mml:mo>=</mml:mo> <mml:msubsup> <mml:mrow> <mml:mn>1.99</mml:mn> </mml:mrow> <mml:mrow> <mml:mo>−</mml:mo> <mml:mn>0.28</mml:mn> </mml:mrow> <mml:mrow> <mml:mo>+</mml:mo> <mml:mn>0.29</mml:mn> </mml:mrow> </mml:msubsup> </mml:math> , leading to an X-ray luminosity of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:msub> <mml:mrow> <mml:mi>L</mml:mi> </mml:mrow> <mml:mrow> <mml:mn>2</mml:mn> <mml:mo>–</mml:mo> <mml:mn>10</mml:mn> </mml:mrow> </mml:msub> <mml:mo>=</mml:mo> <mml:msubsup> <mml:mrow> <mml:mn>1.26</mml:mn> </mml:mrow> <mml:mrow> <mml:mo>−</mml:mo> <mml:mn>0.33</mml:mn> </mml:mrow> <mml:mrow> <mml:mo>+</mml:mo> <mml:mn>0.45</mml:mn> </mml:mrow> </mml:msubsup> <mml:mo>×</mml:mo> <mml:msup> <mml:mrow> <mml:mn>10</mml:mn> </mml:mrow> <mml:mrow> <mml:mn>45</mml:mn> </mml:mrow> </mml:msup> <mml:mspace width="0.33em"/> <mml:mi>erg</mml:mi> <mml:mspace width="0.33em"/> <mml:msup> <mml:mrow> <mml:mi mathvariant="normal">s</mml:mi> </mml:mrow> <mml:mrow> <mml:mo>−</mml:mo> <mml:mn>1</mml:mn> </mml:mrow> </mml:msup> </mml:math> and an X-ray to UV brightness ratio of α OX = −1.45 ± −0.11. We identify a diffuse structure 50 kpc (∼8″) to the NW of the quasar along the jet axis that corresponds to a 3 σ enhancement in the angular density of emission and can be ruled out as a background fluctuation with a probability of P = 0.9985. While with few detected photons the spectral fit of the structure is uncertain, we find that it has a luminosity of L 2–10 ∼ 10 44 erg s −1 . These observations therefore potentially represent the most distant quasar jet yet seen in X-rays. We find no evidence for excess X-ray emission where the previously reported radio jets are seen (which have an overall linear extent of 0.″28), and a bright X-ray point source located along the jet axis to the SE is revealed by optical and NIR imaging to not be associated with the quasar.

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Идентификаторы

DOI: 10.3847/1538-4357/abe710

Цитирования и источники

Цитирований: 2Использованных источников: 0

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