Structural parameters of mayall II=G1 in M31
文献类型：期刊论文
| 作者 | Ma, J. ; de Grijs, R.; Chen, D.; van den Bergh, S.; Fan, Z.; Wu, Z.; Wu, H.; Zhou, X.; Wu, J.; Jiang, Z.
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| 刊名 | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
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| 出版日期 | 2007-04-21 |
| 卷号 | 376期号:4页码:1621-1629 |
| 关键词 | globular clusters : individual : Mayall II=G1 galaxies : evolution galaxies : individual : M31 |
| 英文摘要 | Mayall II = G1 is one of the most luminous globular clusters (GCs) known in M31. New deep, high-resolution observations with the Advanced Camera for Surveys on the Hubble Space Telescope are used to provide accurate photometric data to the smallest radii yet. In particular, we present the precise variation of ellipticity and position angle, and of surface brightness for the core of the object. Based on these accurate photometric data, we redetermine the structural parameters of G1 by fitting a single-mass isotropic King model. We derive a core radius, r(c) = 0.21 +/- 0.01 arcsec (=0.78 +/- 0.04 pc), a tidal radius, r(t) = 21.8 +/- 1,1 arcsec (-80.7 +/- 3.9 pc), and a concentration index c = log (r(t)/rc) = 2.01 +/- 0.02. The central surface brightness is 13.510 mag arcsec(-2). We also calculate the half-light radius, at r(h) = 1.73 +/- 0.07 arcsec (= 6.5 +/- 0.3 pc). The results show that, within 10 core radii, a King model fits the surface brightness distribution well. We find that this object falls in the same region of the M-V versus log R-h diagram as omega Centauri, M54 and NGC 2419 in the Milky Way. All three of these objects have been claimed to be the stripped cores of now defunct dwarf galaxies. We discuss in detail whether GCs, stripped cores of dwarf spheroidals and normal dwarf galaxies form a continuous distribution in the M-V versus log R-h plane, or if GCs and dwarf spheroidals constitute distinct classes of objects; we present arguments in favour of this latter view. |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000245675700012 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/7288]  |
| 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.Natl Res Council Canada, Herzberg Inst Astrophys, Dominion Astrophys Observ, Victoria, BC V9E 2E7, Canada 4.Grad Univ, Chinese Acad Sci, Beijing 100049, Peoples R China |
| 推荐引用方式 GB/T 7714 | Ma, J.,de Grijs, R.,Chen, D.,et al. Structural parameters of mayall II=G1 in M31[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2007,376(4):1621-1629. |
| APA | Ma, J..,de Grijs, R..,Chen, D..,van den Bergh, S..,Fan, Z..,...&Chen, J..(2007).Structural parameters of mayall II=G1 in M31.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,376(4),1621-1629. |
| MLA | Ma, J.,et al."Structural parameters of mayall II=G1 in M31".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 376.4(2007):1621-1629. |
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来源：国家天文台
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