ULTRAMASSIVE BLACK HOLE COALESCENCE
文献类型：期刊论文
| 作者 | Khan, Fazeel Mahmood1; Holley-Bockelmann, Kelly2,3; Berczik, Peter4,5,6
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| 刊名 | ASTROPHYSICAL JOURNAL
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| 出版日期 | 2015-01-10 |
| 卷号 | 798期号:2 |
| 关键词 | black hole physics galaxies: kinematics and dynamics Galaxy: center |
| 英文摘要 | Although supermassive black holes (SMBHs) correlate well with their host galaxies, there is an emerging view that outliers exist. Henize 2-10, NGC 4889, and NGC 1277 are examples of SMBHs at least an order of magnitude more massive than their host galaxy suggests. The dynamical effects of such ultramassive central black holes is unclear. Here, we perform direct N-body simulations of mergers of galactic nuclei where one black hole is ultramassive to study the evolution of the remnant and the black hole dynamics in this extreme regime. We find that the merger remnant is axisymmetric near the center, while near the large SMBH influence radius, the galaxy is triaxial. The SMBH separation shrinks rapidly due to dynamical friction, and quickly forms a binary black hole; if we scale our model to the most massive estimate for the NGC 1277 black hole, for example, the timescale for the SMBH separation to shrink from nearly a kiloparsec to less than a parsec is roughly 10 Myr. By the time the SMBHs form a hard binary, gravitational wave emission dominates, and the black holes coalesce in a mere few Myr. Curiously, these extremely massive binaries appear to nearly bypass the three-body scattering evolutionary phase. Our study suggests that in this extreme case, SMBH coalescence is governed by dynamical friction followed nearly directly by gravitational wave emission, resulting in a rapid and efficient SMBH coalescence timescale. We discuss the implications for gravitational wave event rates and hypervelocity star production. |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000350853700038 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/5730]  |
| 专题 | 国家天文台_星系宇宙学研究部 |
| 作者单位 | 1.Inst Space Technol, Dept Space Sci, Islamabad, Pakistan 2.Vanderbilt Univ, Dept Phys & Astron, Nashville, TN 37235 USA 3.Fisk Univ, Dept Phys, Nashville, TN USA 4.Chinese Acad Sci, Natl Astron Observ China, Beijing 100012, Peoples R China 5.Heidelberg Univ, Astron Rechen Inst, Zentrum Astron, D-69120 Heidelberg, Germany 6.Natl Acad Sci Ukraine, Main Astron Observ, UA-03680 Kiev, Ukraine |
| 推荐引用方式 GB/T 7714 | Khan, Fazeel Mahmood,Holley-Bockelmann, Kelly,Berczik, Peter. ULTRAMASSIVE BLACK HOLE COALESCENCE[J]. ASTROPHYSICAL JOURNAL,2015,798(2). |
| APA | Khan, Fazeel Mahmood,Holley-Bockelmann, Kelly,&Berczik, Peter.(2015).ULTRAMASSIVE BLACK HOLE COALESCENCE.ASTROPHYSICAL JOURNAL,798(2). |
| MLA | Khan, Fazeel Mahmood,et al."ULTRAMASSIVE BLACK HOLE COALESCENCE".ASTROPHYSICAL JOURNAL 798.2(2015). |
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来源：国家天文台
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