| Abstract: | We estimate the value of the spin of the supermassive black hole (SMBH) of the high‐redshift quasar ULAS J112001.48 +064124.3 using new observational data for its mass, bolometric luminosity, and X‐ray spectrum. We show that, assuming equilibrium between the magnetic and the accretion gas pressures at the event horizon radius, the spin of the SMBH is negative. This result implies that the SMBH in this quasar is rotating retrograde with respect to the accretion disk. (© 2015 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim) |
