Hypervelocity Stars II. The Bound Population

Details Hypervelocity Stars II. The Bound Population Hypervelocity Stars II. The Bound Population

2007-01-21

arxiv.org/abs/astro-ph/0701600v1

Astrophys.J.660:311-318,2007

Astronomy and Astrophysics

Astrophysics

8 pages, accepted to ApJ

Scientific paper

10.1086/513595

Hypervelocity stars (HVSs) are stars ejected completely out of the Milky Way by three-body interactions with the massive black hole in the Galactic center. We describe 643 new spectroscopic observations from our targeted survey for HVSs. We find a significant (3.5 sigma) excess of B-type stars with large velocities +27510 kpc that are most plausibly explained as a new class of HVSs: stars ejected from the Galactic center on bound orbits. If a Galactic center ejection origin is correct, the distribution of HVSs on the sky should be anisotropic for a survey complete to a fixed limiting apparent magnitude. The unbound HVSs in our survey have a marginally anisotropic distribution on the sky, consistent with the Galactic center ejection picture.

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