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ON THE SPATIAL DISTRIBUTION AND THE ORIGIN OF HYPERVELOCITY STARS
Lu, Youjun1; Zhang, Fupeng1; Yu, Qingjuan2
2010-02-01
Source PublicationASTROPHYSICAL JOURNAL
Volume709Issue:2Pages:1356-1361
AbstractHypervelocity stars (HVSs) escaping away from the Galactic halo are dynamical products of interactions of stars with the massive black hole(s) (MBH) in the Galactic Center (GC). They are mainly B-type stars with their progenitors unknown. OB stars are also populated in the GC, with many being hosted in a clockwise-rotating young stellar (CWS) disk within half a parsec from the MBH and their formation remaining puzzles. In this paper, we demonstrate that HVSs can well memorize the injecting directions of their progenitors using both analytical arguments and numerical simulations, i.e., the ejecting direction of an HVS is almost anti-parallel to the injecting direction of its progenitor. Therefore, the spatial distribution of HVSs maps the spatial distribution of the parent population of their progenitors directly. We also find that almost all the discovered HVSs are spatially consistent with being located on two thin disk planes. The orientation of one plane is consistent with that of the (inner) CWS disk, which suggests that most of the HVSs originate from the CWS disk or a previously existed disk-like stellar structure with an orientation similar to it. The rest of HVSs may be correlated with the plane of the northern arm of the mini-spiral in the GC or the plane defined by the outer warped part of the CWS disk. Our results not only support the GC origin of HVSs but also imply that the central disk (or the disk structure with a similar orientation) should persist or be frequently rejuvenated over the past 200 Myr, which adds a new challenge to the stellar disk formation and provides insights to the longstanding problem of gas fueling into MBHs.
KeywordBlack Hole Physics Galaxy: Center Galaxy: Halo Galaxy: Kinematics And Dynamics Galaxy: Structure
DOI10.1088/0004-637X/709/2/1356
Indexed BySCI
Language英语
WOS IDWOS:000273579800063
Citation statistics
Cited Times:31[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/7712
Collection星系宇宙学研究部
Affiliation1.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
2.Peking Univ, Kavli Inst Astron & Astrophys, Beijing 100871, Peoples R China
Recommended Citation
GB/T 7714
Lu, Youjun,Zhang, Fupeng,Yu, Qingjuan. ON THE SPATIAL DISTRIBUTION AND THE ORIGIN OF HYPERVELOCITY STARS[J]. ASTROPHYSICAL JOURNAL,2010,709(2):1356-1361.
APA Lu, Youjun,Zhang, Fupeng,&Yu, Qingjuan.(2010).ON THE SPATIAL DISTRIBUTION AND THE ORIGIN OF HYPERVELOCITY STARS.ASTROPHYSICAL JOURNAL,709(2),1356-1361.
MLA Lu, Youjun,et al."ON THE SPATIAL DISTRIBUTION AND THE ORIGIN OF HYPERVELOCITY STARS".ASTROPHYSICAL JOURNAL 709.2(2010):1356-1361.
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