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

  title={Enhanced X-Ray Emission from the Most Radio-powerful Quasar in the Universe’s First Billion Years},
  author={Thomas Connor and Eduardo Ba{\~n}ados and Daniel Stern and Christopher L. Carilli and Andrew C. Fabian and Emmanuel Momjian and Sof{\'i}a Rojas-Ruiz and Roberto Decarli and Emanuele Paolo Farina and Chiara Mazzucchelli and Hannah P. Earnshaw},
  journal={The Astrophysical Journal},
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 Γ=1.99−0.28+0.29 , leading to an X-ray luminosity of L2–10=1.26−0.33+0.45×1045ergs−1 and an X-ray to UV brightness… 
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2018c, Natur, 553
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