SCYON Abstract

Received on December 5 2006

The core radius of a star cluster containing a massive black hole

AuthorsDouglas C. Heggie (1), Piet Hut (2), Shin Mineshige (3), Jun Makino (4), and Holger Baumgardt (5)
Affiliation
(1) University of Edinburgh, UK
(2) Princeton University, USA
(3) University of Kyoto, Japan
(4) National Observatory of Japan
(5) Bonn University, Germany
Submitted toPublication of the ASJ
Contactd.c.heggie@ed.ac.uk
URLhttp://arxiv.org/abs/astro-ph/0611950
Links

Abstract

We present a theoretical framework which establishes how the core radius of a star cluster varies with the mass of an assumed central black hole. Our result is that the ratio of core to half-mass radius varies as the 3/4 power of the ratio of the black hole to cluster mass. The theory compares favourably with a number of simulations of this problem, which extend to black hole masses of order 10% of the cluster mass. Though strictly limited as yet to clusters with stars of equal mass, our conclusion strengthens the view that clusters with large core radii are the most promising candidates in which to find a massive black hole.