STRUCTURAL PARAMETERS FOR 10 HALO GLOBULAR CLUSTERS IN M33
文献类型：期刊论文
| 作者 | Ma, Jun
|
| 刊名 | ASTRONOMICAL JOURNAL
 |
| 出版日期 | 2015-05-01 |
| 卷号 | 149期号:5 |
| 关键词 | galaxies: individual (M33) galaxies: star clusters: general galaxies: stellar content |
| 英文摘要 | In this paper, we present the properties of 10 halo globular clusters (GCs) with luminosities L similar or equal to 5-7 x 10(5) L-circle dot in the Local Group galaxy M33 using images from the Hubble Space Telescope WFPC2 in the F555W and F814W bands. We obtained the ellipticities, position angles, and surface brightness profiles for each GC. In general, the ellipticities of the M33 sample clusters are similar to those of the M31 clusters. The structural and dynamical parameters are derived by fitting the profiles to three different models combined with mass-to-light ratios (M/L values) from population-synthesis models. The structural parameters include core radii, concentration, half-light radii, and central surface brightness. The dynamical parameters include the integrated cluster mass, integrated binding energy, central surface mass density, and predicted line of sight velocity dispersion at the cluster center. The velocity dispersions of the four clusters predicted here agree well with the observed dispersions by Larsen et al. The results here showed that the majority of the sample halo GCs are better fitted by both the King model and the Wilson model than the Sersic model. In general, the properties of the clusters in M33, M31, and the Milky Way fall in the same regions of parameter spaces. The tight correlations of cluster properties indicate a "fundamental plane" for clusters, which reflects some universal physical conditions and processes operating at the epoch of cluster formation. |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000354065200008 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/5706]  |
| 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 | Ma, Jun. STRUCTURAL PARAMETERS FOR 10 HALO GLOBULAR CLUSTERS IN M33[J]. ASTRONOMICAL JOURNAL,2015,149(5). |
| APA | Ma, Jun.(2015).STRUCTURAL PARAMETERS FOR 10 HALO GLOBULAR CLUSTERS IN M33.ASTRONOMICAL JOURNAL,149(5). |
| MLA | Ma, Jun."STRUCTURAL PARAMETERS FOR 10 HALO GLOBULAR CLUSTERS IN M33".ASTRONOMICAL JOURNAL 149.5(2015). |
入库方式： OAI收割
来源：国家天文台
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