Black hole demographics from the M•-σ relation

被引:334
作者
Merritt, D [1 ]
Ferrarese, L [1 ]
机构
[1] Rutgers State Univ, Dept Phys & Astron, New Brunswick, NJ 08854 USA
关键词
galaxies : active; galaxies : fundamental parameters; galaxies : kinematics and dynamics;
D O I
10.1046/j.1365-8711.2001.04165.x
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We analyse 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-., using the tight empirical correlation between M-. and bulge stellar velocity dispersion. The frequency function N[log(M.Mbulge)] is reasonably well described as a Gaussian with < log(M.Mbulge)> approximate to -2.90 and standard deviation similar to0.45; the implied mean ratio of black hole mass to bulge mass is a factor of similar to5 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 similar to 5x10(5) M-. Mpc(3), consistent with that inferred from high-redshift (z similar to2) active galactic nuclei.
引用
收藏
页码:L30 / L34
页数:5
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