Astronomy and Astrophysics – Astrophysics
Scientific paper
2002-01-04
Astrophys.J.576:899-907,2002
Astronomy and Astrophysics
Astrophysics
19 pages, ApJ in press
Scientific paper
10.1086/341798
We study the growth rate of stars via stellar collisions in dense star clusters, calibrating our analytic calculations with direct N-body simulations of up to 65536 stars, performed on the GRAPE family of special-purpose computers. We find that star clusters with initial half-mass relaxation times of about 25 Myr are dominated by stellar collisions, the first collisions occurring at or near the point of core collapse, which is driven by the segregation of the most massive stars to the cluster center, where they end up in hard binaries. The majority of collisions occur with the same star, resulting in the runaway growth of a supermassive object. This object can grow up to about 0.1% of the mass of the entire star cluster and could manifest itself as an intermediate-mass black hole (IMBH). The phase of runaway growth lasts until mass loss by stellar evolution arrests core collapse. Star clusters older than about 5 Myr and with present-day half-mass relaxation times less than 100 Myr are expected to contain an IMBH.
McMillan Steve L. W.
Portegies Zwart Simon. F.
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