Very extreme mass-ratio bursts in the Galaxy and neighbouring galaxies in relation to space-borne detectors. (arXiv:2004.04016v2 [gr-qc] UPDATED)
<a href="http://arxiv.org/find/gr-qc/1/au:+Han_W/0/1/0/all/0/1">Wen-Biao Han</a>, <a href="http://arxiv.org/find/gr-qc/1/au:+Zhong_X/0/1/0/all/0/1">Xing-Yu Zhong</a>, <a href="http://arxiv.org/find/gr-qc/1/au:+Chen_X/0/1/0/all/0/1">Xian Chen</a>, <a href="http://arxiv.org/find/gr-qc/1/au:+Xin_S/0/1/0/all/0/1">Shuo Xin</a>
Two recent paperscitep{xmri1, xmri2} revealed that in our Galaxy there are
very extreme-mass-ratio inspirals composed by brown dwarfs and the supermassive
black hole at the center of the Galaxy. The event rates estimated in these
papers are very considerable for future space-borne detectors. In addition,
there are plunge events during the formation of inspiraling orbits. In this
work, we calculate the gravitational waves from compact objects (brown dwarf,
primordial black hole and etc.) plunging into or being scattered by the central
supermassive black hole. We find that for space-borne detectors the
signal-to-noise ratios of these bursts are quite high. The event rates are
estimated as $sim$ $0.01 {rm{yr}^{-1}}$ for the Galaxy. If we are lucky, this
kind of very extreme-mass-ratio bursts will offer a unique chance to reveal the
nearest supermassive black hole and nuclei dynamics. The event rate can be as
large as 4 $sim$ 8 ${rm yr^{-1}}$ in 10 Mpc, and because the signal is strong
enough for observations by space-borne detectors, we have a good chance of
being able to probe the nature of neighboring black holes.
Two recent paperscitep{xmri1, xmri2} revealed that in our Galaxy there are
very extreme-mass-ratio inspirals composed by brown dwarfs and the supermassive
black hole at the center of the Galaxy. The event rates estimated in these
papers are very considerable for future space-borne detectors. In addition,
there are plunge events during the formation of inspiraling orbits. In this
work, we calculate the gravitational waves from compact objects (brown dwarf,
primordial black hole and etc.) plunging into or being scattered by the central
supermassive black hole. We find that for space-borne detectors the
signal-to-noise ratios of these bursts are quite high. The event rates are
estimated as $sim$ $0.01 {rm{yr}^{-1}}$ for the Galaxy. If we are lucky, this
kind of very extreme-mass-ratio bursts will offer a unique chance to reveal the
nearest supermassive black hole and nuclei dynamics. The event rate can be as
large as 4 $sim$ 8 ${rm yr^{-1}}$ in 10 Mpc, and because the signal is strong
enough for observations by space-borne detectors, we have a good chance of
being able to probe the nature of neighboring black holes.
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