Hypervelocity binary stars: smoking gun of massive binary black holes

Details Hypervelocity binary stars: smoking gun of massive binary black holes Hypervelocity binary stars: smoking gun of massive binary black holes

2007-07-12

arxiv.org/abs/0707.1872v2

Astrophys.J.666:L89-L92,2007

Astronomy and Astrophysics

Astrophysics

5 pages, 3 figures, shortened version, ApJL in press

Scientific paper

10.1086/521708

The hypervelocity stars recently found in the Galactic halo are expelled from the Galactic center through interactions between binary stars and the central massive black hole or between single stars and a hypothetical massive binary black hole. In this paper, we demonstrate that binary stars can be ejected out of the Galactic center with velocities up to 10^3 km/s, while preserving their integrity, through interactions with a massive binary black hole. Binary stars are unlikely to attain such high velocities via scattering by a single massive black hole or through any other mechanisms. Based on the above theoretical prediction, we propose a search for binary systems among the hypervelocity stars. Discovery of hypervelocity binary stars, even one, is a definitive evidence of the existence of a massive binary black hole in the Galactic center.

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