Journal
ASTROPHYSICAL JOURNAL
Volume 723, Issue 1, Pages 812-817Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/723/1/812
Keywords
Galaxy: center; Galaxy: halo; Galaxy: kinematics and dynamics; Galaxy: stellar content; stars: luminosity function, mass function
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Funding
- NSF [PHY-0551164, AST-0757888, AST-0098435]
- US National Science Foundation [PHY 02-16783, PHY 08-22648]
- Alfred P. Sloan Foundation
- US Department of Energy
- Division Of Astronomical Sciences
- Direct For Mathematical & Physical Scien [0757888] Funding Source: National Science Foundation
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We present new limits on the ejection of metal-rich old-population hypervelocity stars (HVSs) from the Galactic center (GC) as probed by the SEGUE-2 survey. Our limits are a factor of 3-10 more stringent than previously reported, depending on stellar type. Compared to the known population of B-star ejectees, there can be no more than 30 times more metal-rich old-population F/G stars ejected from the GC. Because B stars comprise a tiny fraction of a normal stellar population, this places significant limits on the combination of the GC mass function and the ejection mechanism for HVSs. In the presence of a normal GC mass function, our results require an ejection mechanism that is about 5.5 times more efficient at ejecting B stars compared to low-mass F/G stars.
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