Chandrasekhar's dynamical friction and non-extensive statistics

doi:10.1088/1475-7516/2016/05/021

	Chandrasekhar's dynamical friction and non-extensive statistics
	Silva, J. M.1; Lima, J. A. S.2; de Souza, R. E.2; Del Popolo, A.3,4,5; Le Delliou, Morgan 6; Lee, Xi-Guo 7
刊名	JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
	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.
资助项目	FAPESP Agency ; FAPESP (Brazilian Research Agency) ; CNPq (Brazilian Research Agency) ; PNPD/CAPES[20132029]
WOS关键词	SUPERMASSIVE BLACK-HOLES ; DWARF SPHEROIDAL GALAXY ; DARK-MATTER ; GRAVITATIONAL-FIELD ; GASEOUS MEDIUM ; CLUSTERS ; SYSTEMS ; FLUCTUATIONS ; SATELLITE ; CORE
WOS研究方向	Astronomy & Astrophysics ; Physics
语种	英语
出版者	IOP PUBLISHING LTD
WOS记录号	WOS:000378041500022
资助机构	FAPESP Agency ; FAPESP (Brazilian Research Agency) ; CNPq (Brazilian Research Agency) ; PNPD/CAPES
内容类型	期刊论文
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.