Black Hole Masses of High-Redshift Quasars

Details Black Hole Masses of High-Redshift Quasars Black Hole Masses of High-Redshift Quasars

2004-07-16

arxiv.org/abs/astro-ph/0407325v1

Astronomy and Astrophysics

Astrophysics

4 pages with 2 figures, to appear in proceedings of Multiwavelength AGN Surveys, ed. R. Mujica and R. Maiolino (Singapore: Wor

Scientific paper

Black-hole masses of distant quasars cannot be measured directly, but can be estimated to within a factor 3 to 5 using scaling relationships involving the quasar luminosity and broad-line width. Why such relationships are reasonable is summarized. The results of applying scaling relationships to data of quasars at a range of redshifts (z <= 6.3) are presented. Luminous quasars typically have masses of order 1 billion solar masses even at the highest redshifts. The fact that such massive black holes appear as early as at z ~ 6 indicate that black holes form very early or build up mass very fast.

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