Gravitational wave burst produced by merging of central black holes of galaxies

Details Gravitational wave burst produced by merging of central black holes of galaxies Gravitational wave burst produced by merging of central black holes of galaxies

Sep 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...396l..61f&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 396, no. 2, Sept. 10, 1992, p. L61-L63.

Astronomy and Astrophysics

Astronomy

17

Black Holes (Astronomy), Extraterrestrial Radiation, Galactic Evolution, Gravitational Waves, Elliptical Galaxies, Interacting Galaxies, Many Body Problem, Orbital Mechanics

Scientific paper

When galaxies merge, the central black holes rapidly sink toward the center of the system and make a binary. It is found that this black hole binary merges within less than or approximately equal to 10 exp 9 yr. This merging of black holes produces an intense burst of the gravitational wave. The nature of these gravitational wave bursts, is investigated, and it is found that the dimensionless amplitude at the earth is as high as 10 exp -15 if black holes with massesof 10 exp 8 solar masses merge at the distance of 2 Gpc. The mean time between bursts is about 2 yr if the elliptical galaxies are the merger remnants of galaxies having central black holes. It is found that dynamical friction makes the orbit highly eccentric. The lifetime of a binary with a highly eccentric orbit is much shorter than that of a binary with a circular orbit, because the emission of the gravitational wave is much stronger for shorter periastron distance.

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