A critical review of the evidence for M32 being a compact dwarf satellite of M31 rather than a more distant normal galaxy
文献类型：期刊论文
| 作者 | Young, C. Ke-Shih1,2,3,4; Currie, Malcolm J.5; Dickens, Robert J.5; Luol, A-Li1; Zhang, Tong-He6 |
| 刊名 | CHINESE JOURNAL OF ASTRONOMY AND ASTROPHYSICS
 |
| 出版日期 | 2008-08-01 |
| 卷号 | 8期号:4页码:369-384 |
| 关键词 | galaxies : individual : M32 galaxies : distances and redshifts galaxies : dwarf galaxies : elliptical and lenticular galaxies : fundamental parameters cD |
| 英文摘要 | Since Baade's photographic study of M32 in the mid 1940s, it has been accepted as an established fact that M32 is a compact dwarf satellite of M31. The purpose of this paper is to report on the findings of our investigation into the nature of the existing evidence. We find that the case for M32 being a satellite of M31 rests upon Hubble Space Telescope (HST) based stellar population studies which have resolved red-giant branch (RGB) and red clump stars in M32 as well as other nearby galaxies. Taken in isolation, this recent evidence could be considered to be conclusive in favour of the existing view. However, the conventional scenario does not explain M32's anomalously high central velocity dispersion for a dwarf galaxy (several times that of either NGC 147, NGC 185 or NGC 205) or existing planetary nebula observations (which suggest that M32 is more than twice as distant as M31) and also requires an elaborate physical explanation for M32's inferred compactness. Conversely, we find that the case for M32 being a normal galaxy, of the order of three times as distant as M31, is supported by: (1) a central velocity dispersion typical of intermediate galaxies, (2) the published planetary nebula observations, and (3) known scaling relationships for normal early-type galaxies. However, this novel scenario cannot account for the high apparent luminosities of the RGB stars resolved in the M32 direction by HST observations. We are therefore left with two apparently irreconcilable scenarios, only one of which can be correct, but both of which suffer from potentially fatal evidence to the contrary. This suggests that current understanding of some relevant fields is still very far from adequate. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 关键词[WOS] | SURFACE BRIGHTNESS FLUCTUATIONS ; GLOBULAR-CLUSTER SYSTEM ; TELESCOPE KEY PROJECT ; LOCAL GROUP GALAXIES ; ELLIPTIC GALAXIES ; PLANETARY-NEBULAE ; FORNAX CLUSTER ; ANDROMEDA NEBULA ; HUBBLE CONSTANT ; STELLAR CONTENT |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000258698200001 |
| 源URL | [http://119.78.226.72/handle/331011/19520]  |
| 专题 | 上海天文台_星系宇宙学重点实验室 |
| 作者单位 | 1.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China 2.Chinese Acad Sci, Shanghai Astron Observ, Shanghai 200030, Peoples R China 3.Univ Hong Kong, Dept Phys, Hong Kong, Hong Kong, Peoples R China 4.Univ New S Wales, Sch Phys, Sydney, NSW 2052, Australia 5.Rutherford Appleton Lab, Didcot OX11 0QX, Oxon, England 6.Beijing Normal Univ, Dept Astron, Beijing 100875, Peoples R China |
| 推荐引用方式 GB/T 7714 | Young, C. Ke-Shih,Currie, Malcolm J.,Dickens, Robert J.,et al. A critical review of the evidence for M32 being a compact dwarf satellite of M31 rather than a more distant normal galaxy[J]. CHINESE JOURNAL OF ASTRONOMY AND ASTROPHYSICS,2008,8(4):369-384. |
| APA | Young, C. Ke-Shih,Currie, Malcolm J.,Dickens, Robert J.,Luol, A-Li,&Zhang, Tong-He.(2008).A critical review of the evidence for M32 being a compact dwarf satellite of M31 rather than a more distant normal galaxy.CHINESE JOURNAL OF ASTRONOMY AND ASTROPHYSICS,8(4),369-384. |
| MLA | Young, C. Ke-Shih,et al."A critical review of the evidence for M32 being a compact dwarf satellite of M31 rather than a more distant normal galaxy".CHINESE JOURNAL OF ASTRONOMY AND ASTROPHYSICS 8.4(2008):369-384. |
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来源：上海天文台
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