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Long-term evolution of spheroidal galaxies with locally isotropic velocity distribution
Fu, YN; Sun, YS
1998-10-01
Source PublicationCHINESE ASTRONOMY AND ASTROPHYSICS
ISSN0275-1062
Volume22Issue:4Pages:429-441
AbstractThe 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.
KeywordCelestial Mechanics Galactic Dynamics Galactic Oscillation
Subject AreaAstronomy & Astrophysics
WOS HeadingsScience & Technology ; Physical Sciences
WOS KeywordCOLLISIONLESS STELLAR-SYSTEMS ; UNDAMPED OSCILLATIONS ; GALACTIC DISK
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000082336900008
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/8339
Collection历算和天文参考系研究团组
Affiliation1.Nanjing Univ, Dept Astron, Nanjing 210008, Peoples R China
2.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Peoples R China
Recommended Citation
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.
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