Star-disc interaction in galactic nuclei: orbits and rates of accreted stars
文献类型：期刊论文
| 作者 | Kennedy, Gareth F.1,2 ; Meiron, Yohai1,2,3; Shukirgaliyev, Bekdaulet4,5,7; Panamarev, Taras4,5,7; Berczik, Peter1,2,5,6; Just, Andreas5; Spurzem, Rainer1,2,3,5
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| 刊名 | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
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| 出版日期 | 2016-07-21 |
| 卷号 | 460期号:1页码:240-255 |
| 关键词 | accretion accretion discs methods: numerical celestial mechanics galaxies: active galaxies: nuclei |
| 英文摘要 | We examine the effect of an accretion disc on the orbits of stars in the central star cluster surrounding a central massive black hole by performing a suite of 39 high-accuracy direct N-body simulations using state-of-the art software and accelerator hardware, with particle numbers up to 128k. The primary focus is on the accretion rate of stars by the black hole (equivalent to their tidal disruption rate for black holes in the small to medium mass range) and the eccentricity distribution of these stars. Our simulations vary not only the particle number, but disc model (two models examined), spatial resolution at the centre (characterized by the numerical accretion radius) and softening length. The large parameter range and physically realistic modelling allow us for the first time to confidently extrapolate these results to real galactic centres. While in a real galactic centre both particle number and accretion radius differ by a few orders of magnitude from our models, which are constrained by numerical capability, we find that the stellar accretion rate converges for models with N a parts per thousand yen 32k. The eccentricity distribution of accreted stars, however, does not converge. We find that there are two competing effects at work when improving the resolution: larger particle number leads to a smaller fraction of stars accreted on nearly circular orbits, while higher spatial resolution increases this fraction. We scale our simulations to some nearby galaxies and find that the expected boost in stellar accretion (or tidal disruption, which could be observed as X-ray flares) in the presence of a gas disc is about a factor of 10. Even with this boost, the accretion of mass from stars is still a factor of similar to 100 slower than the accretion of gas from the disc. Thus, it seems accretion of stars is not a major contributor to black hole mass growth. |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000379835200015 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/5290]  |
| 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 China, 20A Datun Rd, Beijing 100012, Peoples R China 2.Chinese Acad Sci, Key Lab Computat Astrophys, 20A Datun Rd, Beijing 100012, Peoples R China 3.Peking Univ, Kavli Inst Astron & Astrophys, 5 Yiheyuan Rd, Beijing 100871, Peoples R China 4.Fesenkov Astrophys Inst, Observ 23, Alma Ata 050020, Kazakhstan 5.Heidelberg Univ, Zentrum Astron, Astron Rechen Inst, Monchhofstr 12-14, D-69120 Heidelberg, Germany 6.Natl Acad Sci Ukraine, Main Astron Observ, 27 Akad Zabolotnoho St, UA-03680 Kiev, Ukraine 7.Univ Heidelberg IMPRS HD, Int Max Planck Res Sch Astron, Cosm Phys, Heidelberg, Germany |
| 推荐引用方式 GB/T 7714 | Kennedy, Gareth F.,Meiron, Yohai,Shukirgaliyev, Bekdaulet,et al. Star-disc interaction in galactic nuclei: orbits and rates of accreted stars[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2016,460(1):240-255. |
| APA | Kennedy, Gareth F..,Meiron, Yohai.,Shukirgaliyev, Bekdaulet.,Panamarev, Taras.,Berczik, Peter.,...&Spurzem, Rainer.(2016).Star-disc interaction in galactic nuclei: orbits and rates of accreted stars.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,460(1),240-255. |
| MLA | Kennedy, Gareth F.,et al."Star-disc interaction in galactic nuclei: orbits and rates of accreted stars".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 460.1(2016):240-255. |
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