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

Xue-Bing Wu, Feige Wang, Xiaohui Fan +10

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 ($10^9{M}_{\odot }$). T…