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Metal abundance and kinematical properties of the M81 globular cluster system
Ma, Jun1,2; Wu, Zhen-Yu1; Zhang, Tian-Meng1; Wang, Song1,3; Fan, Zhou1; Wu, Jiang-Hua4; Zou, Hu1; Du, Cui-Hua5; Zhou, Xu1; Yuan, Qi-Rong6
2013-04-01
发表期刊RESEARCH IN ASTRONOMY AND ASTROPHYSICS
卷号13期号:4页码:399-410
摘要We present metal abundance properties of 144 globular clusters associated with M81. These globulars represent the largest globular cluster sample in M81 till now. Our main results are: the distribution of metallicities is bimodal, with metallicity peaks at [Fe/H] approximate to -1.51 and -0.58, and the metal-poor globular clusters tend to be less spatially concentrated than the metal-rich ones; the metal-rich globular clusters in M81 do not demonstrate a centrally concentrated spatial distribution like the metal-rich ones in M31 do; like our Galaxy and M31, the globular clusters in M81 have a small radial metallicity gradient. These results are consistent with those obtained from a small sample of M81 globular clusters. In addition, this paper shows that there is evidence that a strong rotation of the M81 globular cluster system around the minor axis exists, and that rotation is present in the metal-rich globular cluster subsample, but themetal-poor globular cluster subsample shows no evidence of rotation. The most significant difference between the rotation of the metal-rich and metal-poor globular clusters occurs at intermediate projected galactocentric radii. Our results confirm the conclusion of Schroder et al. that M81's metal-rich globular clusters at intermediate projected radii are associated with a thick disk of M81.
关键词Galaxies: Individual (M81) Galaxies: Star Clusters Globular Clusters: General
DOI10.1088/1674-4527/13/4/003
收录类别SCI
语种英语
WOS记录号WOS:000316788000003
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文献类型期刊论文
条目标识符http://ir.bao.ac.cn/handle/114a11/8901
专题光学天文研究部
作者单位1.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
2.Chinese Acad Sci, Natl Astron Observ, Key Lab Opt Astron, Beijing 100012, Peoples R China
3.Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China
4.Beijing Normal Univ, Dept Astron, Beijing 100875, Peoples R China
5.Chinese Acad Sci, Grad Univ, Coll Phys Sci, Beijing 100049, Peoples R China
6.Nanjing Normal Univ, Dept Phys, Nanjing 210046, Jiangsu, Peoples R China
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Ma, Jun,Wu, Zhen-Yu,Zhang, Tian-Meng,et al. Metal abundance and kinematical properties of the M81 globular cluster system[J]. RESEARCH IN ASTRONOMY AND ASTROPHYSICS,2013,13(4):399-410.
APA Ma, Jun.,Wu, Zhen-Yu.,Zhang, Tian-Meng.,Wang, Song.,Fan, Zhou.,...&Yuan, Qi-Rong.(2013).Metal abundance and kinematical properties of the M81 globular cluster system.RESEARCH IN ASTRONOMY AND ASTROPHYSICS,13(4),399-410.
MLA Ma, Jun,et al."Metal abundance and kinematical properties of the M81 globular cluster system".RESEARCH IN ASTRONOMY AND ASTROPHYSICS 13.4(2013):399-410.
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