The Cosmic Density of Massive Black Holes from Galaxy Velocity Dispersions

Details The Cosmic Density of Massive Black Holes from Galaxy Velocity Dispersions The Cosmic Density of Massive Black Holes from Galaxy Velocity Dispersions

2002-10-25

arxiv.org/abs/astro-ph/0210573v1

Astronomy and Astrophysics

Astrophysics

To appear in the December 2002 issue of The Astronomical Journal

Scientific paper

10.1086/344484

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_bullet - sigma relation) to make an improved estimate of the mass density and mass spectrum of supermassive black holes. Uncertainties in the M_bullet - sigma relation have little effect on the mass density. We find a mass density of (4.8 +/- 1.6) h^2 x 10^5 M_sun 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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