Application of three-body stability to globular clusters - I. The stability radius

	Application of three-body stability to globular clusters - I. The stability radius
	Kennedy, Gareth F.1,2
刊名	MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
	2014-11-11
卷号	444 期号:4 页码:3328-3339
关键词	gravitation methods: analytical globular clusters: general
英文摘要	The tidal radius is commonly determined analytically by equating the tidal field of the galaxy to the gravitational potential of the cluster. Stars crossing this radius can move from orbiting the cluster centre to independently orbiting the galaxy. In this paper, the stability radius of a globular cluster is estimated using a novel approach from the theoretical standpoint of the general three-body problem. This is achieved by an analytical formula for the transition radius between stable and unstable orbits in a globular cluster. A stability analysis, outlined by Mardling, is used here to predict the occurrence of unstable stellar orbits in the outermost region of a globular cluster in a distant orbit around a galaxy. It is found that the eccentricity of the cluster-galaxy orbit has a far more significant effect on the stability radius of globular clusters than previous theoretical results of the tidal radius have found. A simple analytical formula is given for determining the transition between stable and unstable orbits, which is analogous to the tidal radius for a globular cluster. The stability radius estimate is interior to tidal radius estimates and gives the innermost region from which stars can random walk to their eventual escape from the cluster. The time-scale for this random walk process is also estimated using numerical three-body scattering experiments.
收录类别	SCI
语种	英语
WOS记录号	WOS:000343400100024
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/6377]
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, Beijing 100012, Peoples R China 2.Monash Univ, Monash Ctr Astrophys, Clayton, Vic 3800, Australia
推荐引用方式 GB/T 7714	Kennedy, Gareth F.. Application of three-body stability to globular clusters - I. The stability radius[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2014,444(4):3328-3339.
APA	Kennedy, Gareth F..(2014).Application of three-body stability to globular clusters - I. The stability radius.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,444(4),3328-3339.
MLA	Kennedy, Gareth F.."Application of three-body stability to globular clusters - I. The stability radius".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 444.4(2014):3328-3339.