An ultraluminous quasar with a twelve-billion-solar-mass black hole at redshift 6.30

  title={An ultraluminous quasar with a twelve-billion-solar-mass black hole at redshift 6.30},
  author={Xue-Bing Wu and Feige Wang and Xiaohui Fan and Weimin Yi and Wenwen Zuo and Fuyan Bian and Linhua Jiang and Ian D. McGreer and Ran Wang and Jinyi Yang and Qian Yang and David H. Thompson and Yuri Beletsky},
So far, roughly 40 quasars with redshifts greater than z = 6 have been discovered. Each quasar contains a black hole with a mass of about one billion solar masses (109 ). The existence of such black holes when the Universe was less than one billion years old presents substantial challenges to theories of the formation and growth of black holes and the coevolution of black holes and galaxies. Here we report the discovery of an ultraluminous quasar, SDSS J010013.02+280225.8, at redshift z = 6.30… 

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