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Title:
The Cosmic Density of Massive Black Holes from Galaxy Velocity Dispersions
Authors:
Aller, M. C.; Richstone, D.
Affiliation:
AA(Department of Astronomy, University of Michigan, 830 Dennison Building, Ann Arbor, MI 48109; , ), AB(Department of Astronomy, University of Michigan, 830 Dennison Building, Ann Arbor, MI 48109; , )
Publication:
The Astronomical Journal, Volume 124, Issue 6, pp. 3035-3041. (AJ Homepage)
Publication Date:
12/2002
Origin:
UCP
AJ Keywords:
Galaxies: General, Galaxies: Nuclei
DOI:
10.1086/344484
Bibliographic Code:
2002AJ....124.3035A

Abstract

Supermassive black holes are thought to be relics of quasars, and their numbers and masses are therefore related to the quasar luminosity function and its evolution with redshift. We have used the relationship between black hole mass and bulge velocity dispersion (the M•-σ relation) to make an improved estimate of the mass density and mass spectrum of supermassive black holes. Uncertainties in the M•-σ relation have little effect on the mass density. We find a mass density of (4.8+/-1.6)h2×105 Msolar Mpc-3. Some of the variance in published density estimates comes from the use of different values of the Hubble constant.
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