The DOI matches its Crossref record; 33 of the 33 references it cites were found in a registry or an index.
Ejection of Hypervelocity Stars by the (Binary) Black Hole in the Galactic Center
Open accessAbstract
We study three processes that eject hypervelocity (>10 3 km s -1 ) stars from the Galactic center: (1) close encounters of two single stars, (2) tidal breakup of binary stars by the central black hole, as originally proposed by Hills, and (3) three-body interactions between a star and a binary black hole (BBH). Mechanism 1 expels hypervelocity stars to the solar radius, R 0 = 8 kpc, at a negligible rate, ~10 -11 yr -1 . Mechanism 2 expels hypervelocity stars at a rate ~10 -5 (η/0.1) yr -1 , where η is the fraction of stars in binaries with semimajor axis a b ≲ 0.3 AU. For solar mass stars, the corresponding number of hypervelocity stars within the solar radius is ~60(η/0.1)( a b /0.1 AU) 1/2 . For mechanism 3, Sgr A* is assumed to be one component of a BBH. We constrain the allowed parameter space (semimajor axis, mass ratio) of the BBH. In the allowed region (for example, a semimajor axis of 0.5 × 10 -3 pc and a mass ratio of 0.01), the rate of ejection of hypervelocity stars can be as large as ~10 -4 yr -1 , and the expected number of hypervelocity stars within the solar radius can be as large as ~10 3 . Hypervelocity stars may be detectable by the next generation of large-scale optical surveys.
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Cites
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Cited by
The Galactic Center massive black hole and nuclear star cluster
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GIANT GAMMA-RAY BUBBLES FROM FERMI-LAT: ACTIVE GALACTIC NUCLEUS ACTIVITY OR BIPOLAR GALACTIC WIND?
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LAMOST Experiment for Galactic Understanding and Exploration (LEGUE) — The survey's science plan
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Metadata
- Authors
- Yu, Q., & Tremaine, S.
- Venue
- The Astrophysical Journal
- Publisher
- American Astronomical Society
- Published
- 2003-12-20
- Volume
- 599
- Issue
- 2
- Pages
- 1129-1138
- ISSN
- 0004-637X (ISSN-L)
- 1538-4357
- OpenAlex
- W2153555990
- Cited by
- 408
- References
- 33
- FWCI
- 9.47
- Type
- journal article
- Language
- en
- Open access
- bronze
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