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Hypervelocity Stars II. The Bound Population | | Warren R. Brown
; Margaret J. Geller
; Scott J. Kenyon
; Michael J. Kurtz
; Benjamin C. Bromley
; | | Date: |
21 Jan 2007 | | Abstract: | 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 +275<v_rf<450 km/s and distances d>10 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. | | Source: | arXiv, astro-ph/0701600 | | Services: | Forum | Review | PDF | Favorites | |
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