The Fate of Former Companions to Hypervelocity Stars Originating at the Galactic Center

Details The Fate of Former Companions to Hypervelocity Stars Originating at the Galactic Center The Fate of Former Companions to Hypervelocity Stars Originating at the Galactic Center

2005-10-19

arxiv.org/abs/astro-ph/0510574v2

Mon.Not.Roy.Astron.Soc.368:221-225,2006

Astronomy and Astrophysics

Astrophysics

Accepted for publication in MNRAS

Scientific paper

10.1111/j.1365-2966.2006.10091.x

The hypervelocity star SDSS J090745.0+024507 in the halo of the Milky Way galaxy (Brown et al. 2005) most likely originated from the breakup of a binary star system by the central black hole, SgrA* (Hills 1988). We examine the fate of former binary companions to similar hypervelocity stars (HVSs) by simulating 600 different binary orbits around SgrA* with a direct N-body integration code. For some orbital parameters, the binary breakup process leads to HVSs with ejection velocities that are almost an order of magnitude larger than the velocity observed for SDSS J090745.0+024507. The former companion stars populate highly eccentric orbits which resemble the observed orbits for some of the stars nearest to SgrA*.

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