Old stellar population synthesis: new age and mass estimates for Mayall II=G1
文献类型：期刊论文
| 作者 | Ma, Jun1 ; de Grijs, Richard1,2; Fan, Zhou1,3; Rey, Soo-Chang4; Wu, Zhen-Yu1; Zhou, Xu1; Wu, Jiang-Hua1; Jiang, Zhao-Ji1; Chen, Jian-Sheng1; Lee, Kyungsook4
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| 刊名 | RESEARCH IN ASTRONOMY AND ASTROPHYSICS
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| 出版日期 | 2009-06-01 |
| 卷号 | 9期号:6页码:641-652 |
| 关键词 | galaxies: individual (M31) galaxies: star clusters galaxies: stellar content |
| 英文摘要 | Mayall II = G1 is one of the most luminous globular clusters (GCs) in M31. Here, we determine its age and mass by comparing multicolor photometry with theoretical stellar population synthesis models. Based on far- and near-ultraviolet GALEX photometry, broad-band UBVRI, and infrared JHK(s) 2MASS data, we construct the most extensive spectral energy distribution of G I to date, spanning the wavelength range from 1538 to 20000 angstrom. A quantitative comparison with a variety of simple stellar population (SSP) models yields a mean age which is consistent with G1 being among the oldest building blocks of M31 and having formed within similar to 1.7 Gyr after the Big Bang. Irrespective of the SSP model or stellar initial mass function adopted, the resulting mass estimates (of order 10(7) M(circle dot)) indicate that G1 is one of the most massive GCs in the Local Group. However, we speculate that the cluster's exceptionally high mass suggests that it may not be a genuine GC. Our results also suggest that G1 may contain, on average, (1.65+/-0.63) X 10(2) L(circle dot) far-ultraviolet-bright, hot, extreme horizontal-branch stars, depending on the adopted SSP model. In addition, we demonstrate that extensive multi-passband photometry coupled with SSP analysis enables one to obtain age estimates for old SSPs that have similar accuracies as those from integrated spectroscopy or resolved stellar photometry, provided that some of the free parameters can be constrained independently. |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000267180100003 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/7602]  |
| 专题 | 国家天文台_光学天文研究部 |
| 作者单位 | 1.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China 2.Univ Sheffield, Dept Phys & Astron, Sheffield S3 7RH, S Yorkshire, England 3.Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China 4.Chungnam Natl Univ, Dept Astron & Space Sci, Taejon 305764, South Korea 5.Yonsei Univ, Ctr Space Astrophys, Seoul 120749, South Korea 6.CALTECH, Pasadena, CA 91125 USA |
| 推荐引用方式 GB/T 7714 | Ma, Jun,de Grijs, Richard,Fan, Zhou,et al. Old stellar population synthesis: new age and mass estimates for Mayall II=G1[J]. RESEARCH IN ASTRONOMY AND ASTROPHYSICS,2009,9(6):641-652. |
| APA | Ma, Jun.,de Grijs, Richard.,Fan, Zhou.,Rey, Soo-Chang.,Wu, Zhen-Yu.,...&Sohn, Sangmo Tony.(2009).Old stellar population synthesis: new age and mass estimates for Mayall II=G1.RESEARCH IN ASTRONOMY AND ASTROPHYSICS,9(6),641-652. |
| MLA | Ma, Jun,et al."Old stellar population synthesis: new age and mass estimates for Mayall II=G1".RESEARCH IN ASTRONOMY AND ASTROPHYSICS 9.6(2009):641-652. |
入库方式： OAI收割
来源：国家天文台
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