Quantifying Departures from Equilibrium with the Spherical Jeans Equation

doi:10.3847/1538-4357/aa7205

	Quantifying Departures from Equilibrium with the Spherical Jeans Equation
	Evslin, Jarah 1,2; Del Popolo, Antonino 3,4,5
刊名	ASTROPHYSICAL JOURNAL
	2017-06-01
卷号	841 页码:14
关键词	astrometry galaxies: kinematics and dynamics Local Group proper motions
ISSN号	0004-637X
DOI	10.3847/1538-4357/aa7205
英文摘要	Proper motions of collisionless, pointlike objects in a spherically symmetric system-for example, stars in a galaxy-can be used to test whether that system is in equilibrium, with no assumptions regarding isotropy. In particular, the fourth-order spherical Jeans equation yields expressions for two observable quantities characterizing the departure from equilibrium, both of which can be expressed in terms of time derivatives of first and third moments of the velocities. As illustrations, we compute these quantities for tracer distributions drawn from an exact equilibrium configuration, and also from near-equilibrium configurations generated using the N-body code GALIC.
资助项目	NSFC MianShang[11375201] ; Recruitment Program of High-end Foreign Experts ; CAS Key Research Program of Frontier Sciences[QYZDY-SSW-SLH006]
WOS关键词	DWARF SPHEROIDAL GALAXY ; COLD DARK-MATTER ; DENSITY PROFILE ; FORNAX DWARF ; WIDE-FIELD ; MILKY-WAY ; SHAPE ; ANNIHILATION ; DEGENERACY ; PARAMETERS
WOS研究方向	Astronomy & Astrophysics
语种	英语
出版者	IOP PUBLISHING LTD
WOS记录号	WOS:000402310800024
资助机构	NSFC MianShang ; Recruitment Program of High-end Foreign Experts ; CAS Key Research Program of Frontier Sciences
内容类型	期刊论文
源URL	[http://119.78.100.186/handle/113462/24511]
专题	中国科学院近代物理研究所
通讯作者	Evslin, Jarah
作者单位	1.Chinese Acad Sci, Inst Modern Phys, NanChangLu 509, Lanzhou 730000, Peoples R China 2.Univ Chinese Acad Sci, YuQuanLu 19A, Beijing 100049, Peoples R China 3.Univ Catania, Dipartimento Fis & Astron, Viale Andrea Doria 6, I-95125 Catania, Italy 4.INFN, 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
推荐引用方式 GB/T 7714	Evslin, Jarah,Del Popolo, Antonino. Quantifying Departures from Equilibrium with the Spherical Jeans Equation[J]. ASTROPHYSICAL JOURNAL,2017,841:14.
APA	Evslin, Jarah,&Del Popolo, Antonino.(2017).Quantifying Departures from Equilibrium with the Spherical Jeans Equation.ASTROPHYSICAL JOURNAL,841,14.
MLA	Evslin, Jarah,et al."Quantifying Departures from Equilibrium with the Spherical Jeans Equation".ASTROPHYSICAL JOURNAL 841(2017):14.