Black Hole Demographics from the M(BH)-sigma Relation

Details Black Hole Demographics from the M(BH)-sigma Relation Black Hole Demographics from the M(BH)-sigma Relation

2000-09-05

arxiv.org/abs/astro-ph/0009076v3

Mon.Not.Roy.Astron.Soc. 320 (2001) L30

Astronomy and Astrophysics

Astrophysics

12 Latex pages, 4 postscript figures

Scientific paper

10.1046/j.1365-8711.2001.04165.x

We analyze a sample of 32 galaxies for which a dynamical estimate of the mass of the hot stellar component, M_bulge, is available. For each of these galaxies, we calculate the mass of the central black hole, M_BH, using the tight empirical correlation between M_BH and the bulge stellar velocity dispersion. The frequency function N(log M_BH/M_bulge) is reasonably well described as a Gaussian with ~ -2.90 and standard deviation 0.45; the implied mean ratio of black hole to bulge mass is a factor 5 smaller than generally quoted in the literature. We present marginal evidence for a lower, average black-hole mass fraction in more massive galaxies. The total mass density in black holes in the local Universe is estimated to be 5 x 10^5 solar masses per cubic megaparsec, consistent with that inferred from high redshift (z ~ 2) AGNs.

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