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
Source PublicationRESEARCH IN ASTRONOMY AND ASTROPHYSICS
Volume11Issue:11Pages:1298-1310
AbstractWe 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.
KeywordGalaxies: Individual (M31) Galaxies: Star Clusters Globular Clusters: General Star Clusters: General
Indexed BySCI
Language英语
WOS IDWOS:000297441300005
Citation statistics
Cited Times:6[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/8032
Collection光学天文研究部
AffiliationChinese Acad Sci, Natl Astron Observ, Key Lab Opt Astron, Beijing 100012, Peoples R China
Recommended Citation
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.
Files in This Item:
There are no files associated with this item.
Related Services
Recommend this item
Bookmark
Usage statistics
Export to Endnote
Google Scholar
Similar articles in Google Scholar
[Fan, Zhou]'s Articles
[Huang, Ya-Fang]'s Articles
[Li, Jin-Zeng]'s Articles
Baidu academic
Similar articles in Baidu academic
[Fan, Zhou]'s Articles
[Huang, Ya-Fang]'s Articles
[Li, Jin-Zeng]'s Articles
Bing Scholar
Similar articles in Bing Scholar
[Fan, Zhou]'s Articles
[Huang, Ya-Fang]'s Articles
[Li, Jin-Zeng]'s Articles
Terms of Use
No data!
Social Bookmark/Share
All comments (0)
No comment.
 

Items in the repository are protected by copyright, with all rights reserved, unless otherwise indicated.