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**Session 111 - Massive Black Holes and Dynamics of Galaxy Cores.**

*Oral session, Thursday, January 16*

*Harbour A, *

## [111.04] The demography of massive central black holes

*J. Magorrian, S. Tremaine (CITA), K. Gebhardt, D. Richstone (U. Michigan), S. Faber (UCO Lick Obs.)*
There are currently around 10 galaxies for which there
is strong evidence for a massive central black hole.
Kormendy amp; Richstone have
pointed out a striking correlation between galaxy and
BH mass, namely
M_bh\sim0.004M_gal.
An interesting question is whether this
correlation is due to a narrow ridge in the probability
distribution p(M_bh|M_gal), or whether it
is merely a selection effect.

We attempt to answer this question using a sample of 36
galaxies for which HST photometry and ground-based
kinematics are available. Each galaxy is assumed to be
axisymmetric, with an arbitrary inclination angle, and a
central BH of arbitrary mass. Moreover, each is assumed
to be well described by a two-integral DF. These
assumptions allow us to calculate the likelihood of the
sample given any p(M_bh|M_gal),
and thus to calculate bookmakers' odds for different
assumed forms for the latter.

**Program
listing for Thursday**