Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005hia....13..386f&link_type=abstract
In: Highlights of Astronomy, Vol. 13, as presented at the XXVth General Assembly of the IAU - 2003 [Sydney, Australia, 13 - 26 J
Astronomy and Astrophysics
Astronomy
Dense Stellar Systems
Scientific paper
We propose a possible way of forming massive black holes (MBHs) from stellar mass black holes (SBHs) through intermediate mass black holes (IMBHs).
We assume that the SBHs can be formed from massive stars. Although this is possible it was thought to be difficult that SBHs merge into massive black holes.
When SBHs have to be born in a star cluster they concentrate in the center of the cluster. After concentration they cannot grow through merging since they are ejected the from the cluster due to sling shots.
When the star cluster is enough large and the potential of the center of the cluster is enough deep to enclose SBHs the SBHs cannot concentrate into the center for the largeness of the cluster.
The situation seems a dead end for SBHs born in star clusters. However the discovery of an IMBH in a star cluster in M82 suggests that there is a possible way to form a MBH from SBHs through IMBHs.
Here we show that it is possible for the IMBHs born in star clusters to merge and to form a MBH from the point of view of dynamical evolution of star clusters in a host galaxy.
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