Dynamical friction of massive objects in galactic centres
文献类型：期刊论文
| 作者 | Just, A.1; Khan, F. M.1,2; Berczik, P.1,3,4 ; Ernst, A.1; Spurzem, R.1,3,5
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| 刊名 | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
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| 出版日期 | 2011-02-01 |
| 卷号 | 411期号:1页码:653-674 |
| 关键词 | black hole physics stars: kinematics and dynamics Galaxy: centre Galaxy: nucleus galaxies: kinematics and dynamics galaxies: nuclei |
| 英文摘要 | Dynamical friction leads to an orbital decay of massive objects like young compact star clusters or massive black holes in central regions of galaxies. The dynamical friction force can be well approximated by Chandrasekhar's standard formula, but recent investigations show that corrections to the Coulomb logarithm are necessary. With a large set of N-body simulations we show that the improved formula for the Coulomb logarithm fits the orbital decay very well for circular and eccentric orbits. The local scalelength of the background density distribution serves as the maximum impact parameter for a wide range of power-law indices of -1 ... -5. For each type of code the numerical resolution must be compared to the effective minimum impact parameter in order to determine the Coulomb logarithm. We also quantify the correction factors by using self-consistent velocity distribution functions instead of the standard Maxwellian often used. These factors enter directly the decay time-scale and cover a range of 0.5 ... 3 for typical orbits. The new Coulomb logarithm combined with self-consistent velocity distribution functions in the Chandrasekhar formula provides a significant improvement of orbital decay times with correction up to one order of magnitude compared to the standard case. We suggest the general use of the improved formula in parameter studies as well as in special applications. |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000286525600070 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/7918]  |
| 专题 | 国家天文台_星系宇宙学研究部 |
| 作者单位 | 1.Heidelberg Univ, Zentrum Astron, Astron Rechen Inst, D-69120 Heidelberg, Germany 2.Govt Coll Univ, Dept Phys, Lahore 54000, Pakistan 3.Chinese Acad Sci, NAOC, Beijing 100012, Peoples R China 4.NASU, MAO, UA-03680 Kiev, Ukraine 5.Peking Univ, Kavli Inst Astron & Astrophys, Beijing, Peoples R China |
| 推荐引用方式 GB/T 7714 | Just, A.,Khan, F. M.,Berczik, P.,et al. Dynamical friction of massive objects in galactic centres[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2011,411(1):653-674. |
| APA | Just, A.,Khan, F. M.,Berczik, P.,Ernst, A.,&Spurzem, R..(2011).Dynamical friction of massive objects in galactic centres.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,411(1),653-674. |
| MLA | Just, A.,et al."Dynamical friction of massive objects in galactic centres".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 411.1(2011):653-674. |
入库方式： OAI收割
来源：国家天文台
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