NAOC Open IR  > 光学天文研究部
Spectroscopic study of globular clusters in the halo of M31 with the Xinglong 2.16 m telescope
Fan, Zhou; Huang, Ya-Fang; Li, Jin-Zeng; Zhou, Xu; Ma, Jun; Wu, Hong; Zhang, Tian-Meng; Zhao, Yong-Heng
2011-11-01
发表期刊RESEARCH IN ASTRONOMY AND ASTROPHYSICS
卷号11期号:11页码:1298-1310
摘要We present spectroscopic observations for 11 confirmed globular clusters (GCs) of M31 with the OMR spectrograph on the 2.16m telescope at the Xinglong site of National Astronomical Observatories, Chinese Academy of Sciences. Nine of our sample clusters are located in the halo of M31 and the most remote one is out to a projected radius of 78.75 kpc from the galactic center. For all our sample clusters, we measured the Lick absorption-line indices and radial velocities. It is noted that most GCs in our sample are distinct from the HI rotation curve of galaxy M31, especially for B514, MCGC5, H12 and B517, suggesting that most of our sample clusters do not have a kinematic association with the star-forming young disk of the galaxy. We separately fitted the absorption line indices from the updated stellar population model of Thomas et al. with two different tracks of Cassisi and Padova, by applying the chi(2) - minimization method. The fitting results show that all our sample clusters are older than 10 Gyr, and metal-poor (-2.38 <= [Fe/H] <= -0.91 dex). After merging the spectroscopic metallicity of our work with the previously published ones, we extended the cluster sample out to a projected radius of 117 kpc from the galaxy's center. We found the metallicity gradient exists for all the confirmed clusters with a slope of -0.028 +/- 0.001 dex kpc(-1). However, the slope turns out to be -0.018 +/- 0.001 dex kpc(-1) for all the halo clusters, which is much shallower. If we only consider the outer halo clusters with r(p) > 25 kpc, the slope becomes -0.010 +/- 0.002 dex kpc(-1) and if one cluster G001 is excluded from the outer halo sample, the slope is -0.004 +/- 0.002 dex kpc(-1). Thus, we conclude that the metallicity gradient for M31's outer halo clusters is not significant, which agrees well with previous findings.
关键词Galaxies: Individual (M31) Galaxies: Star Clusters Globular Clusters: General Star Clusters: General
收录类别SCI
语种英语
WOS记录号WOS:000297441300005
引用统计
被引频次:5[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.bao.ac.cn/handle/114a11/8032
专题光学天文研究部
作者单位Chinese Acad Sci, Natl Astron Observ, Key Lab Opt Astron, Beijing 100012, Peoples R China
推荐引用方式
GB/T 7714
Fan, Zhou,Huang, Ya-Fang,Li, Jin-Zeng,et al. Spectroscopic study of globular clusters in the halo of M31 with the Xinglong 2.16 m telescope[J]. RESEARCH IN ASTRONOMY AND ASTROPHYSICS,2011,11(11):1298-1310.
APA Fan, Zhou.,Huang, Ya-Fang.,Li, Jin-Zeng.,Zhou, Xu.,Ma, Jun.,...&Zhao, Yong-Heng.(2011).Spectroscopic study of globular clusters in the halo of M31 with the Xinglong 2.16 m telescope.RESEARCH IN ASTRONOMY AND ASTROPHYSICS,11(11),1298-1310.
MLA Fan, Zhou,et al."Spectroscopic study of globular clusters in the halo of M31 with the Xinglong 2.16 m telescope".RESEARCH IN ASTRONOMY AND ASTROPHYSICS 11.11(2011):1298-1310.
条目包含的文件
条目无相关文件。
个性服务
推荐该条目
保存到收藏夹
查看访问统计
导出为Endnote文件
谷歌学术
谷歌学术中相似的文章
[Fan, Zhou]的文章
[Huang, Ya-Fang]的文章
[Li, Jin-Zeng]的文章
百度学术
百度学术中相似的文章
[Fan, Zhou]的文章
[Huang, Ya-Fang]的文章
[Li, Jin-Zeng]的文章
必应学术
必应学术中相似的文章
[Fan, Zhou]的文章
[Huang, Ya-Fang]的文章
[Li, Jin-Zeng]的文章
相关权益政策
暂无数据
收藏/分享
所有评论 (0)
暂无评论
 

除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。