Black hole demographics from the M(bh) - sigma relation - INSPIRE

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Black hole demographics from the M(bh) - sigma relation

Sep, 2000

12 pages

Published in:

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

e-Print:

astro-ph/0009076 [astro-ph]

DOI:

10.1046/j.1365-8711.2001.04165.x

Report number:

RUTGERS-ASTROPHYSICS-PREPRINT-SERIES-NO-282

View in:

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Abstract: (arXiv)

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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