ON THE EXISTENCE OF PULSARS IN THE VICINITY OF THE MASSIVE BLACK HOLE IN THE GALACTIC CENTER
文献类型：期刊论文
| 作者 | Zhang, Fupeng1,2; Lu, Youjun1 ; Yu, Qingjuan2
|
| 刊名 | ASTROPHYSICAL JOURNAL
 |
| 出版日期 | 2014-04-01 |
| 卷号 | 784期号:2 |
| 关键词 | black hole physics Galaxy: center Galaxy: kinematics and dynamics pulsars: general |
| 英文摘要 | Pulsars, if existing and detectable in the immediate vicinity of the massive black hole (MBH) in the Galactic center (GC), may be used as a superb tool to probe both the environment and the metric of the central MBH. The recent discovery of a magnetized pulsar in the GC suggests that many more pulsars should exist near the MBH. In this paper, we estimate the number and the orbital distribution of pulsars in the vicinity of the MBH in the GC by assuming that the pulsar progenitors, similar to the GC S-stars, were captured to orbits tightly bound to the MBH through the tidal breakup of stellar binaries. We use the current observations on both the GC S-stars and the hypervelocity stars to calibrate the injection rate(s) of and the dynamical model(s) for the stellar binaries. By including the relaxation processes, supernova kicks, and gravitational wave radiation in our simulations, we estimate that similar to 97-190 (9-14) pulsars may presently orbit the central MBH with semimajor axes <= 4000AU (<= 1000AU), which is compatible with the current observational constraints on the number of the GC pulsars. The semimajor axis and the pericenter distance of the pulsar closest to the central MBH are probably in the range of similar to 120-460AU and similar to 2-230AU, respectively. Future telescopes, such as the Square Kilometer Array, may be able to detect a significant number of pulsars with semimajor axis smaller than a few thousand AU in the GC. Long-term monitoring of these pulsars would be helpful in constraining both the environment and the metric of the central MBH. Our preferred model also results in about ten hyperfast pulsars with velocity greater than or similar to 1500 km s(-1) moving away from the Milky Way. |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000335519400021 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/6621]  |
| 专题 | 国家天文台_星系宇宙学研究部 |
| 作者单位 | 1.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China 2.Peking Univ, Kavli Inst Astron & Astrophys, Beijing 100871, Peoples R China |
| 推荐引用方式 GB/T 7714 | Zhang, Fupeng,Lu, Youjun,Yu, Qingjuan. ON THE EXISTENCE OF PULSARS IN THE VICINITY OF THE MASSIVE BLACK HOLE IN THE GALACTIC CENTER[J]. ASTROPHYSICAL JOURNAL,2014,784(2). |
| APA | Zhang, Fupeng,Lu, Youjun,&Yu, Qingjuan.(2014).ON THE EXISTENCE OF PULSARS IN THE VICINITY OF THE MASSIVE BLACK HOLE IN THE GALACTIC CENTER.ASTROPHYSICAL JOURNAL,784(2). |
| MLA | Zhang, Fupeng,et al."ON THE EXISTENCE OF PULSARS IN THE VICINITY OF THE MASSIVE BLACK HOLE IN THE GALACTIC CENTER".ASTROPHYSICAL JOURNAL 784.2(2014). |
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来源：国家天文台
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