Time scales and tidal effects in minor mergers

	Time scales and tidal effects in minor mergers
	Lu, Y; Wei, JY
刊名	CHINESE JOURNAL OF ASTRONOMY AND ASTROPHYSICS
	2003-10-01
卷号	3 期号:5 页码:395-409
关键词	cosmology : dark matter galaxies : kinematics and dynamics galaxies : structure galaxies : interactions numerical methods
英文摘要	We use controlled N-body simulation to investigate the dynamical processes (dynamical friction, tidal truncation, etc.) involved in the merging of small satellites into bigger halos. We confirm the validity of some analytic formulae proposed earlier based on simple arguments. For rigid satellites represented by softened point masses, the merging time scale depends on both the orbital shape and concentration of the satellite. The dependence on orbital ellipticity is roughly a power law, as suggested by Lacey & Cole, and the dependence on satellite concentration is similar to that proposed by White. When merging satellites are represented by non-rigid objects, Tidal effects must be considered. We found that material beyond the tidal radius are stripped off. The decrease in the satellite mass might mean an increase in the merging time scale, but in fact, the merging time is decreased, because the stripped-off material carries away a proportionately larger amount of of orbital energy and angular momentum.
收录类别	SCI
语种	英语
WOS记录号	WOS:000186358900002
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/8417]
专题	国家天文台_空间科学研究部
作者单位	Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
推荐引用方式 GB/T 7714	Lu, Y,Wei, JY. Time scales and tidal effects in minor mergers[J]. CHINESE JOURNAL OF ASTRONOMY AND ASTROPHYSICS,2003,3(5):395-409.
APA	Lu, Y,&Wei, JY.(2003).Time scales and tidal effects in minor mergers.CHINESE JOURNAL OF ASTRONOMY AND ASTROPHYSICS,3(5),395-409.
MLA	Lu, Y,et al."Time scales and tidal effects in minor mergers".CHINESE JOURNAL OF ASTRONOMY AND ASTROPHYSICS 3.5(2003):395-409.