| Abstract: |
To date, over 70 quasars at redshift greater than 5.7 has been discovered. The existence of billion solar mass black holes at such early universe indicates a rapid growth of supermasive black holes (SMBHs) in the early universe and presents challenges on the theory of the formation and growths of SMBHs. Here we report the discovery of the first ten billion solar mass BHs at redshift 6.3 with SDSS, 2MASS and WISE photometric data. It's luminosity is about ten times higher than an average SDSS z~6 quasars and seven times higher than the most distant quasars at redshift 7.1. This ultra-luminous quasar with a 10 billion solar mass BH at z > 6 provides a unique laboratory to the study of the mass assembly and galaxy formation around the most massive BHs in the early Universe. |