http://arxiv.org/abs/2005.06868
From near-infrared spectroscopic measurements of the MgII emission line doublet, we estimate the black hole (BH) mass of the quasar, SMSS J215728.21-360215.1, as being (3.4 +/- 0.6) x 10^10 M_sun and refine the redshift of the quasar to be z=4.692. SMSS J2157 is the most luminous known quasar, yet its Eddington ratio is only ~0.4. Thus, the high luminosity of quasar is a consequence of its extremely large BH — one of the most massive BHs at z > 4.
C. Onken, F. Bian, X. Fan, et. al.
Fri, 15 May 20
39/65
Comments: 7 pages, 3 figures. Submitted to MNRAS