METAL-POOR HYPERVELOCITY STAR CANDIDATES FROM THE SLOAN DIGITAL SKY SURVEY

METAL-POOR HYPERVELOCITY STAR CANDIDATES FROM THE SLOAN DIGITAL SKY SURVEY
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斯隆数字天空调查中的贫金属超高速恒星候选者

DOI:
10.1088/2041-8205/744/2/l24
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发表时间:
2011-12
影响因子:
7.9
通讯作者:
Zuo, Fang
Zuo, Fang
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Li, Yinbi;Luo, Ali;Zhao, Gang;Lu, Youjun;Ren, Juanjuan;Zuo, Fang

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超高速恒星被认为是通过(双星)与中心大质量黑洞的动力学相互作用从银河系中心(GC)弹射出来的。在这封信中,我们报告了从斯隆数字巡天第7号数据发布的37万颗恒星中选出的13颗贫金属F型超高速星星候选者。通过对这些恒星运动学的详细分析,我们发现其中7颗可能是从GC或银河系盘中弹射出来的,4颗既不是来自GC也不是来自银河系盘,另外2颗可能是从银河系盘或其他区域中弹射出来的。那些不太可能起源于GC或银河系盘的候选者可以用其他机制来解释,比如银河系矮星系在银河系势中的潮汐破裂,或者与M31或M32中心的大质量黑洞的引力相互作用。
Hypervelocity stars are believed to be ejected out from the Galactic center (GC) through dynamical interactions of (binary) stars with the central massive black hole(s). In this Letter, we report 13 metal-poor F-type hypervelocity star candidates selected from 370,000 stars of the data release 7 of the Sloan Digital Sky Survey. With a detailed analysis of the kinematics of these stars, we find that seven of them were likely ejected from the GC or the Galactic disk, four neither originated from the GC nor the Galactic disk, and the other two were possibly ejected from either the Galactic disk or other regions. Those candidates that unlikely originated from the GC or the Galactic disk may be explained by other mechanisms, like the tidal disruption of the Milky Way's dwarf galaxies in the Galactic potential, or the gravitational interactions with a massive black hole at the center of M31 or M32.
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发表时间: 2006-03
期刊: The Astrophysical Journal
影响因子: --
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