An 800-million-solar-mass black hole in a significantly neutral Universe at a redshift of 7.5

  title={An 800-million-solar-mass black hole in a significantly neutral Universe at a redshift of 7.5},
  author={Eduardo Ba{\~n}ados and Bram P. Venemans and Chiara Mazzucchelli and Emanuele Paolo Farina and Fabian Walter and Feige Wang and Roberto Decarli and Daniel Stern and Xiaohui Fan and Frederick B. Davies and Joseph F. Hennawi and Robert A. Simcoe and Monica L. Turner and Hans-Walter Rix and Jinyi Yang and Daniel D. Kelson and Gwen C. Rudie and Jack M. Winters},
Quasars are the most luminous non-transient objects known and as a result they enable studies of the Universe at the earliest cosmic epochs. Despite extensive efforts, however, the quasar ULAS J1120 + 0641 at redshift z = 7.09 has remained the only one known at z > 7 for more than half a decade. Here we report observations of the quasar ULAS J134208.10 + 092838.61 (hereafter J1342 + 0928) at redshift z = 7.54. This quasar has a bolometric luminosity of 4 × 1013 times the luminosity of the Sun… 
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