- [*] Intermediate-Mass Black Holes: Formation and
- van der Marel R.P.
- BAAS, 33, 2, 858, 2001 (AAS Meeting 198, 50.06)
- © 2001. The American Astronomical Society.
All Rights Reserved.
Astronomers have long believed that black holes naturally form in the
Universe in two mass ranges. Stellar-mass black holes form when a
heavy star collapses under its own weight in a supernova explosion,
and have been identified in X-ray binaries. Super-massive black holes
probably form as a byproduct of galaxy formation, and are found in the
centers of galaxies where they sometimes generate prodigious activity.
However, black holes could have formed in the Universe in different
mass ranges. Intermediate mass black holes of 10^2-10^5 solar masses
are an especially interesting possibility, in particular since they
may account for the intermediate luminosity X-ray objects that have
recently been identified in nearby galaxies. I will review the
possible formation mechanisms and observational constraints on such
black holes, including the following issues: (a) formation through
stellar evolution; (b) formation during galaxy formation; (c)
primordial black hole formation; (d) constraints from microlensing;
(e) intermediate mass black holes as dark halo constituents; and (f)
intermediate mass black hole formation in stellar clusters.
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Last modified June 15, 2001.
Roeland van der Marel,