Chandrasekhar's dynamical friction and non-extensive statistics
文献类型：期刊论文
| 作者 | Silva, J. M.1; Lima, J. A. S.2; de Souza, R. E.2; Del Popolo, A.3,4,5; Le Delliou, Morgan6; Lee, Xi-Guo7 |
| 刊名 | JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
 |
| 出版日期 | 2016-05-01 |
| 页码 | 18 |
| 关键词 | dwarfs galaxies galaxy dynamics |
| ISSN号 | 1475-7516 |
| DOI | 10.1088/1475-7516/2016/05/021 |
| 英文摘要 | The motion of a point like object of mass M passing through the background potential of massive collisionless particles ern << M) suffers a steady deceleration named dynamical friction. In his classical work, Chandrasekhar assumed a Maxwellian velocity distribution in the halo and neglected the self gravity of the wake induced by the gravitational focusing of the mass M. In this paper, by relaxing the validity of the Maxwellian distribution due to the presence of long range forces, we derive an analytical formula for the dynamical friction in the context of the q-nonextensive kinetic theory. In the extensive limiting case (q - 1), the classical Gaussian Chandrasekhar result is recovered. As an application, the dynamical friction timescale for Globular Clusters spiraling to the galactic center is explicitly obtained. Our results suggest that the problem concerning the large timescale as derived by numerical N-body simulations or semi-analytical models can be understood as a departure from the standard extensive Maxwellian regime as measured by the Tsallis nonextensive q-parameter. |
| WOS关键词 | SUPERMASSIVE BLACK-HOLES ; DWARF SPHEROIDAL GALAXY ; DARK-MATTER ; GRAVITATIONAL-FIELD ; GASEOUS MEDIUM ; CLUSTERS ; SYSTEMS ; FLUCTUATIONS ; SATELLITE ; CORE |
| 资助项目 | FAPESP Agency ; FAPESP (Brazilian Research Agency) ; CNPq (Brazilian Research Agency) ; PNPD/CAPES[20132029] |
| WOS研究方向 | Astronomy & Astrophysics ; Physics |
| 语种 | 英语 |
| WOS记录号 | WOS:000378041500022 |
| 出版者 | IOP PUBLISHING LTD |
| 资助机构 | FAPESP Agency ; FAPESP (Brazilian Research Agency) ; CNPq (Brazilian Research Agency) ; PNPD/CAPES |
| 源URL | [http://119.78.100.186/handle/113462/43931]  |
| 专题 | 中国科学院近代物理研究所 |
| 通讯作者 | Silva, J. M. |
| 作者单位 | 1.Univ Fed Campina Grande, Ctr Formacao Professores, Cajazeiras, PB, Brazil 2.Univ Sao Paulo, Inst Astron Geofis & Ciencias Atmosfericas, BR-05508900 Sao Paulo, SP, Brazil 3.Univ Catania, Dipartimento Fis & Astron, Viale Andrea Doria 6, I-95125 Catania, Italy 4.Ist Nazl Fis Nucl, Sez Catania, Via S Sofia 64, I-95123 Catania, Italy 5.Univ Fed Rio Grande do Norte, Int Inst Phys, BR-59012970 Natal, RN, Brazil 6.Univ Estadual Sao Paulo IFT UNESP, Rua Dr Bento Teobaldo Ferraz 271,Bloco 2, BR-01140070 Sao Paulo, SP, Brazil 7.Chinese Acad Sci, Inst Modern Phys, POB 31, Lanzhou, Peoples R China |
| 推荐引用方式 GB/T 7714 | Silva, J. M.,Lima, J. A. S.,de Souza, R. E.,et al. Chandrasekhar's dynamical friction and non-extensive statistics[J]. JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS,2016:18. |
| APA | Silva, J. M.,Lima, J. A. S.,de Souza, R. E.,Del Popolo, A.,Le Delliou, Morgan,&Lee, Xi-Guo.(2016).Chandrasekhar's dynamical friction and non-extensive statistics.JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS,18. |
| MLA | Silva, J. M.,et al."Chandrasekhar's dynamical friction and non-extensive statistics".JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS (2016):18. |
入库方式： OAI收割
来源：近代物理研究所
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