Gravitational waves from stars orbiting the Sagittarius A* black hole

被引:78
作者
Freitag, M [1 ]
机构
[1] CALTECH, Pasadena, CA 91125 USA
基金
美国国家航空航天局;
关键词
black hole physics; Galaxy : nucleus; gravitational waves; stellar dynamics; MONTE-CARLO CODE; CLUSTER SIMULATIONS; MASS; CAPTURE; MILKY;
D O I
10.1086/367813
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
One of the main astrophysical processes leading to strong emission of gravitational waves to be detected by the future space-borne interferometer Laser Interferometer Space Antenna (LISA) is the capture of a compact star by a black hole with a mass of a few million solar masses in the center of a galaxy. In previous studies, main-sequence stars were thought not to contribute because they suffer from early tidal disruption. Here we show that according to our simulations of the stellar dynamics of the Sgr A* cluster, there must be one to a few low-mass main-sequence stars sufficiently bound to the central Galactic black hole to be conspicuous sources in LISA observations. The probability that a white dwarf may be detectable is lower than 0.5, and in spite of mass segregation, detection of a captured neutron star or stellar black hole in the center of the Milky Way is highly unlikely.
引用
收藏
页码:L21 / L24
页数:4
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