Long-term evolution of spheroidal galaxies with locally isotropic velocity distribution

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	Long-term evolution of spheroidal galaxies with locally isotropic velocity distribution
	Fu, YN; Sun, YS
刊名	CHINESE ASTRONOMY AND ASTROPHYSICS
	1998-10-01
卷号	22 期号:4 页码:429-441
关键词	celestial mechanics galactic dynamics galactic oscillation
ISSN号	0275-1062
英文摘要	The short-term evolution of spheroidal galaxies has been explored by S. Chandrasekhar et al. and G. S. Sunder et al. In this paper, we study their long-term evolution with Laskar's method of frequency analysis. The main new results are as follows: (1) There exists a unique equilibrium, which is spherically symmetric. This equilibrium has a critical linear stability. (2) Generally speaking, the semi-axes exhibit quasiperiodic or nearly quasi-periodic (in a time scale longer than a Hubble time) oscillations around the radius of the above-mentioned equilibrium, so the equilibrium is practically stable. (3) There are cases in which one of the semi-axes tends fast to zero while the other to some finite value. The limit state is generally planar rather than linear, i.e. it is the symmetric semi-axis that tends to zero. This implies that some disk galaxies may have originated from spheroidal pregalaxy material.
学科主题	Astronomy & Astrophysics
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	Astronomy & Astrophysics
关键词[WOS]	COLLISIONLESS STELLAR-SYSTEMS ; UNDAMPED OSCILLATIONS ; GALACTIC DISK
收录类别	SCI
语种	英语
WOS记录号	WOS:000082336900008
公开日期	2013-02-05
内容类型	期刊论文
源URL	[http://libir.pmo.ac.cn/handle/332002/8339]
专题	紫金山天文台_历算和天文参考系研究团组
作者单位	1.Nanjing Univ, Dept Astron, Nanjing 210008, Peoples R China 2.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Peoples R China
推荐引用方式 GB/T 7714	Fu, YN,Sun, YS. Long-term evolution of spheroidal galaxies with locally isotropic velocity distribution[J]. CHINESE ASTRONOMY AND ASTROPHYSICS,1998,22(4):429-441.
APA	Fu, YN,&Sun, YS.(1998).Long-term evolution of spheroidal galaxies with locally isotropic velocity distribution.CHINESE ASTRONOMY AND ASTROPHYSICS,22(4),429-441.
MLA	Fu, YN,et al."Long-term evolution of spheroidal galaxies with locally isotropic velocity distribution".CHINESE ASTRONOMY AND ASTROPHYSICS 22.4(1998):429-441.