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Distribution of the disrupted satellite galaxies as a function of metallicity
Lu, Y; Cheng, KS; Deng, LC; Zheng, XZ
2002-07-01
Source PublicationASTRONOMY & ASTROPHYSICS
Volume389Issue:2Pages:387-392
AbstractRecent observations show that some dwarf satellite galaxies fall into the gravitational well of the Galaxy while being disrupted by the tidal force. As a consequence, the Galactic halo suffers contamination from this process, the stellar populations of the tidal disrupted satellites make an additional contribution and alter the intrinsic metallicity distribution of the halo stars. The distribution of this kind of disrupted satellite galaxy as a function of metallicity is investigated in this paper. The model is limited to one class of dwarf spherical satellite galaxy, that is assumed to have similar abundance patterns to the Galactic field halo stars. We discuss their distributions through the links between minor merger processes in the history of the Galaxy and the observed distribution of metal-poor field halo stars. The upper limit of 35% of the metal-poor halo field stars was established by merging of this kind of satellite galaxy with characteristic mass M-sat, and adopting the mass-metallicity relation among dwarf spheroidal galaxy, the distribution of the disrupted satellite galaxy as a function of metallicity is derived to reproduce the observed metallicity distribution of the extremely metal-poor halo field stars in the Galaxy. The problem of missing metal-free halo stars in the Galaxy is explained in this model as well.
KeywordGalaxies : Halos Evolution Abundance Interactions
DOI10.1051/0004-6361:20020617
Indexed BySCI
Language英语
WOS IDWOS:000176817200009
Citation statistics
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/8496
Collection光学天文研究部
Affiliation1.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
2.Univ Hong Kong, Dept Phys, Hong Kong, Hong Kong, Peoples R China
Recommended Citation
GB/T 7714
Lu, Y,Cheng, KS,Deng, LC,et al. Distribution of the disrupted satellite galaxies as a function of metallicity[J]. ASTRONOMY & ASTROPHYSICS,2002,389(2):387-392.
APA Lu, Y,Cheng, KS,Deng, LC,&Zheng, XZ.(2002).Distribution of the disrupted satellite galaxies as a function of metallicity.ASTRONOMY & ASTROPHYSICS,389(2),387-392.
MLA Lu, Y,et al."Distribution of the disrupted satellite galaxies as a function of metallicity".ASTRONOMY & ASTROPHYSICS 389.2(2002):387-392.
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