PROBING ASYMMETRIC STRUCTURES IN THE OUTSKIRTS OF GALAXIES
文献类型：期刊论文
| 作者 | Wen, Zhang Zheng1,2; Zheng, Xian Zhong1; An, Fang Xia1 |
| 刊名 | ASTROPHYSICAL JOURNAL
 |
| 出版日期 | 2014-06-01 |
| 卷号 | 787期号:2页码:0 |
| 关键词 | galaxies: fundamental parameters galaxies: interactions galaxies: peculiar galaxies: structure |
| ISSN号 | 0004-637X |
| 英文摘要 | Upcoming large imaging surveys will allow detailed studies of the structure and morphology of galaxies aimed at addressing how galaxies form and evolve. Computational approaches are needed to characterize their morphologies over large samples. We introduce an automatic method to quantify the outer structure of galaxies. The key to our approach is the division of a galaxy image into two sections delineated by the isophote, which encloses half the total brightness of the galaxy. We call the central section the inner half-flux region (IHR) and the outer section the outer half-flux region (OHR). From this division, we derive two parameters: A(o), which measures the asymmetry of the OHR, and D-o, which measures the deviation of the intensity weighted centroid of the OHR from that of the IHR relative to the effective radius. We derive the two parameters from HST/ACS z(850)-band images for a sample of 764 galaxies with z(850) < 22 mag and 0.35 < z < 0.9 selected from the GEMS and GOODS-South surveys. We show that the sample galaxies having strong asymmetric structures, particularly tidal tails, are well-separated from those with regular morphologies in the A(o)-D-o space. Meanwhile, the widely used CAS and Gini-M-20 methods turn out to be insensitive to such morphological features. We stress that the A(o)-D-o method is an efficient way to select galaxies with significant asymmetric features like tidal tails and study galaxy mergers in the dynamical phase traced by these delicate features. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 关键词[WOS] | MERGER RATE EVOLUTION ; TIDAL DWARF GALAXIES ; MASSIVE GALAXIES ; HIGH-REDSHIFT ; DISTANT GALAXIES ; FIELD GALAXIES ; TIME-SCALES ; MORPHOLOGICAL CLASSIFICATION ; INTERACTING GALAXIES ; LUMINOSITY FUNCTION |
| 收录类别 | SCI |
| 原文出处 | 10.1088/0004-637X/787/2/130 |
| 语种 | 英语 |
| WOS记录号 | WOS:000336246700035 |
| 公开日期 | 2014-11-21 |
| 源URL | [http://libir.pmo.ac.cn/handle/332002/10694]  |
| 专题 | 紫金山天文台_星系中的恒星形成研究团组 |
| 作者单位 | 1.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Jiangsu, Peoples R China 2.Univ Chinese Acad Sci, Beijing, Peoples R China |
| 推荐引用方式 GB/T 7714 | Wen, Zhang Zheng,Zheng, Xian Zhong,An, Fang Xia. PROBING ASYMMETRIC STRUCTURES IN THE OUTSKIRTS OF GALAXIES[J]. ASTROPHYSICAL JOURNAL,2014,787(2):0. |
| APA | Wen, Zhang Zheng,Zheng, Xian Zhong,&An, Fang Xia.(2014).PROBING ASYMMETRIC STRUCTURES IN THE OUTSKIRTS OF GALAXIES.ASTROPHYSICAL JOURNAL,787(2),0. |
| MLA | Wen, Zhang Zheng,et al."PROBING ASYMMETRIC STRUCTURES IN THE OUTSKIRTS OF GALAXIES".ASTROPHYSICAL JOURNAL 787.2(2014):0. |
入库方式： OAI收割
来源：紫金山天文台
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