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Massive Black Hole Binary Evolution

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Author(s): Merritt David | Milosavljević Miloš

Journal: Living Reviews in Relativity
ISSN 1433-8351

Volume: 8;
Start page: 8;
Date: 2005;
Original page

ABSTRACT
Coalescence of binary supermassive black holes (SBHs) would constitute the strongest sources of gravitational waves to be observed by LISA. While the formation of binary SBHs during galaxy mergers is almost inevitable, coalescence requires that the separation between binary components first drop by a few orders of magnitude, due presumably to interaction of the binary with stars and gas in a galactic nucleus. This article reviews the observational evidence for binary SBHs and discusses how they would evolve. No completely convincing case of a bound, binary SBH has yet been found, although a handful of systems (e.g. interacting galaxies; remnants of galaxy mergers) are now believed to contain two SBHs at projected separations of
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