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Scientific paper
Jun 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aipc..575..119m&link_type=abstract
ASTROPHYSICAL SOURCES FOR GROUND-BASED GRAVITATIONAL WAVE DETECTORS. AIP Conference Proceedings, Volume 575, pp. 119-129 (2001)
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1
Spectroscopic Binaries, Close Binaries, Black Holes, Stellar Clusters And Associations, Relativity And Gravitation
Scientific paper
In star clusters, black holes become the most massive objects within a few tens of millions of years; dynamical relaxation then causes them to sink to the cluster core, where they form binaries. These black-hole binaries become more tightly bound by superelastic encounters with other cluster members, and are ultimately ejected from the cluster. The majority of escaping black-hole binaries have orbital periods short enough and eccentricities high enough that the emission of gravitational radiation causes them to coalesce within a few billion years. We predict a black hole merger rate of about 3×10-7 per year per cubic megaparsec. Young star clusters in galactic nuclei may also contribute significantly to this total, although their numbers are presently very uncertain. For the first-generation Laser Interferometer Gravitational-Wave Observatory (LIGO-I), this implies one or two detections during the first two years of operation. For LIGO-II, the rate rises to roughly 1 detection per day. .
McMillan Stephen L. W.
Portegies Zwart Simon. F.
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