Hypervelocity Stars. II. The Bound Population | Zendy

Warren R. Brown | Zendy; Margaret J. Geller | Zendy; Scott J. Kenyon | Zendy; Michael J. Kurtz | Zendy; Benjamin C. Bromley | Zendy

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Hypervelocity Stars. II. The Bound Population

Author(s) -

Warren R. Brown,

Margaret J. Geller,

Scott J. Kenyon,

Michael J. Kurtz,

Benjamin C. Bromley

Publication year - 2007

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/513595

Subject(s) - hypervelocity , physics , milky way , galactic center , astrophysics , stars , sky , astronomy , galactic halo , population , black hole (networking) , galaxy , halo , computer network , routing protocol , demography , routing (electronic design automation) , sociology , computer science , link state routing protocol

Hypervelocity stars (HVSs) are stars ejected completely out of the Milky Wayby three-body interactions with the massive black hole in the Galactic center.We describe 643 new spectroscopic observations from our targeted survey forHVSs. We find a significant (3.5 sigma) excess of B-type stars with largevelocities +27510 kpc that are most plausiblyexplained as a new class of HVSs: stars ejected from the Galactic center onbound orbits. If a Galactic center ejection origin is correct, the distributionof HVSs on the sky should be anisotropic for a survey complete to a fixedlimiting apparent magnitude. The unbound HVSs in our survey have a marginallyanisotropic distribution on the sky, consistent with the Galactic centerejection picture.Comment: 8 pages, accepted to Ap

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