The tidal tails of globular cluster Palomar 5 based on the neural networks method
文献类型：期刊论文
| 作者 | Zou, Hu1,2 ; Wu, Zhen-Yu1; Ma, Jun1; Zhou, Xu1
|
| 刊名 | RESEARCH IN ASTRONOMY AND ASTROPHYSICS
 |
| 出版日期 | 2009-10-01 |
| 卷号 | 9期号:10页码:1131-1148 |
| 关键词 | methods: statistical galaxy: halo galaxy: structure globular cluster: individual (Palomar 5) |
| 英文摘要 | The sixth Data Release (DR6) of the Sloan Digital Sky Survey (SDSS) provides more photometric regions, new features and more accurate data around globular cluster Palomar 5. A new method, Back Propagation Neural Network (BPNN), is used to estimate the cluster membership probability in order to detect its tidal tails. Cluster and field stars, used for training the networks, are extracted over a 40 x 20 deg(2) field by color-magnitude diagrams (CMDs). The best BPNNs with two hidden layers and a Levenberg-Marquardt (LM) training algorithm are determined by the chosen cluster and field samples. The membership probabilities of stars in the whole field are obtained with the BPNNs, and contour maps of the probability distribution show that a tail extends 5.42 degrees to the north of the cluster and another tail extends 3.77 degrees to the south. The tails are similar to those detected by Odenkirchen et al., but no more debris from the cluster is found to the northeast in the sky. The radial density profiles are investigated both along the tails and near the cluster center. Quite a few substructures are discovered in the tails. The number density profile of the cluster is fitted with the King model and the tidal radius is determined as 14.28 degrees. However, the King model cannot fit the observed profile at the outer regions (R > 8') because of the tidal tails generated by the tidal force. Luminosity functions of the cluster and the tidal tails are calculated, which confirm that the tails originate from Palomar 5. |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000271266300005 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/7623]  |
| 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.Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China |
| 推荐引用方式 GB/T 7714 | Zou, Hu,Wu, Zhen-Yu,Ma, Jun,et al. The tidal tails of globular cluster Palomar 5 based on the neural networks method[J]. RESEARCH IN ASTRONOMY AND ASTROPHYSICS,2009,9(10):1131-1148. |
| APA | Zou, Hu,Wu, Zhen-Yu,Ma, Jun,&Zhou, Xu.(2009).The tidal tails of globular cluster Palomar 5 based on the neural networks method.RESEARCH IN ASTRONOMY AND ASTROPHYSICS,9(10),1131-1148. |
| MLA | Zou, Hu,et al."The tidal tails of globular cluster Palomar 5 based on the neural networks method".RESEARCH IN ASTRONOMY AND ASTROPHYSICS 9.10(2009):1131-1148. |
入库方式： OAI收割
来源：国家天文台
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