Origin of the S stars in the galactic center

Lockmann, Ulf, Baumgardt, Holger and Kroupa, Pavel (2008) Origin of the S stars in the galactic center. Astrophysical Journal Letters, 683 2: L151-L154. doi:10.1086/591734

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Author Lockmann, Ulf
Baumgardt, Holger
Kroupa, Pavel
Title Origin of the S stars in the galactic center
Journal name Astrophysical Journal Letters   Check publisher's open access policy
ISSN 2041-8205
Publication date 2008-08
Sub-type Article (original research)
DOI 10.1086/591734
Open Access Status File (Publisher version)
Volume 683
Issue 2
Start page L151
End page L154
Total pages 4
Place of publication Bristol, United Kingdom
Publisher Institute of Physics Publishing
Language eng
Formatted abstract
Over the last 15 years, around a hundred very young stars have been observed in the central parsec of our Galaxy. While the presence of young stars forming one or two stellar disks at ≈0.1 pc from the supermassive black hole (SMBH) can be understood through star formation in accretion disks, the origin of the S stars observed a factor of 10 closer to the SMBH has remained a major puzzle. Here we show the S stars to be a natural consequence of dynamical interaction of two stellar disks at larger radii. Due to precession and Kozai interaction, individual stars achieve extremely high eccentricities at random orientation. Stellar binaries on such eccentric orbits are disrupted due to close passages near the SMBH, leaving behind a single S star on a much tighter orbit. The remaining star may be ejected from the vicinity of the SMBH, thus simultaneously providing an explanation for the observed hypervelocity stars in the Milky Way halo.
Keyword Black hole physics
Galaxy : center
Methods : n-body simulations
Stellar dynamics
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mathematics and Physics
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Citation counts: TR Web of Science Citation Count  Cited 35 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 36 times in Scopus Article | Citations
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