Spectroscopic study of globular clusters in the halo of M31 with the Xinglong 2.16 m telescope
文献类型：期刊论文
| 作者 | Fan, Zhou ; Huang, Ya-Fang; Li, Jin-Zeng; Zhou, Xu; Ma, Jun; Wu, Hong; Zhang, Tian-Meng; Zhao, Yong-Heng
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| 刊名 | RESEARCH IN ASTRONOMY AND ASTROPHYSICS
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| 出版日期 | 2011-11-01 |
| 卷号 | 11期号:11页码:1298-1310 |
| 关键词 | galaxies: individual (M31) galaxies: star clusters globular clusters: general star clusters: general |
| 英文摘要 | 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. |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000297441300005 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/8032]  |
| 专题 | 国家天文台_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. |
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来源：国家天文台
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