SEGUE-2 LIMITS ON METAL-RICH OLD-POPULATION HYPERVELOCITY STARS IN THE GALACTIC HALO

被引:29
作者
Kollmeier, Juna A. [1 ]
Gould, Andrew [2 ]
Rockosi, Constance [3 ]
Beers, Timothy C. [4 ,5 ]
Knapp, Gillian [6 ]
Johnson, Jennifer A. [2 ]
Morrison, Heather [7 ]
Harding, Paul [7 ]
Lee, Young Sun [4 ,5 ]
Weaver, Benjamin A. [8 ]
机构
[1] Observ Carnegie Inst Washington, Pasadena, CA 91101 USA
[2] Ohio State Univ, Columbus, OH 43210 USA
[3] Univ Calif Santa Cruz, Dept Astron & Astrophys, Santa Cruz, CA 95064 USA
[4] Michigan State Univ, Dept Phys & Astron, CSCE, E Lansing, MI 48824 USA
[5] Michigan State Univ, JINA, E Lansing, MI 48824 USA
[6] Princeton Univ, Dept Astrophys Sci, Princeton, NJ 08544 USA
[7] Case Western Reserve Univ, Dept Astron, Cleveland, OH 44106 USA
[8] NYU, Ctr Cosmol & Particle Phys, New York, NY 10003 USA
基金
美国国家科学基金会;
关键词
Galaxy: center; Galaxy: halo; Galaxy: kinematics and dynamics; Galaxy: stellar content; stars: luminosity function; mass function; DIGITAL SKY SURVEY; PROPER-MOTION CATALOG; INITIAL MASS FUNCTION; BINARY BLACK-HOLE; DATA RELEASE; SPATIAL-DISTRIBUTION; OPEN CLUSTERS; USNO-B; EJECTION; VELOCITY;
D O I
10.1088/0004-637X/723/1/812
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
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.
引用
收藏
页码:812 / 817
页数:6
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