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题名: ALIGNMENTS OF GALAXIES WITHIN COSMIC FILAMENTS FROM SDSS DR7
作者: Zhang, Youcai1; Yang, Xiaohu1, 2; Wang, Huiyuan3, 4; Wang Lei(王蕾)5; Mo, H. J.4; van den Bosch, Frank C.6
刊名: ASTROPHYSICAL JOURNAL
出版日期: 2013-12-20
卷号: 779, 期号:2
关键词: cosmology: observations ; large-scale structure of universe ; methods: statistical
DOI: 10.1088/0004-637X/779/2/160
文章类型: Article
英文摘要: Using a sample of galaxy groups selected from the Sloan Digital Sky Survey Data Release 7, we examine the alignment between the orientation of galaxies and their surrounding large-scale structure in the context of the cosmic web. The latter is quantified using the large-scale tidal field, reconstructed from the data using galaxy groups above a certain mass threshold. We find that the major axes of galaxies in filaments tend to be preferentially aligned with the directions of the filaments, while galaxies in sheets have their major axes preferentially aligned parallel to the plane of the sheets. The strength of this alignment signal is strongest for red, central galaxies, and in good agreement with that of dark matter halos in N-body simulations. This suggests that red, central galaxies are well aligned with their host halos, in quantitative agreement with previous studies based on the spatial distribution of satellite galaxies. There is a luminosity and mass dependence that brighter and more massive galaxies in filaments and sheets have stronger alignment signals. We also find that the orientation of galaxies is aligned with the eigenvector associated with the smallest eigenvalue of the tidal tensor. These observational results indicate that galaxy formation is affected by large-scale environments and strongly suggest that galaxies are aligned with each other over scales comparable to those of sheets and filaments in the cosmic web.
WOS标题词: Science & Technology ; Physical Sciences
类目[WOS]: Astronomy & Astrophysics
研究领域[WOS]: Astronomy & Astrophysics
关键词[WOS]: DIGITAL SKY SURVEY ; DARK-MATTER HALOES ; LARGE-SCALE STRUCTURE ; SATELLITE GALAXIES ; INTRINSIC ALIGNMENT ; ENVIRONMENTAL DEPENDENCE ; CLUSTER GALAXIES ; SPIN ALIGNMENT ; STAR-FORMATION ; ORIENTATION
收录类别: SCI
语种: 英语
WOS记录号: WOS:000328187200069
Citation statistics:
内容类型: 期刊论文
URI标识: http://libir.pmo.ac.cn/handle/332002/15520
Appears in Collections:中国科学院紫金山天文台研究生部_学生文章

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作者单位: 1.Shanghai Astron Observ, Key Lab Res Galaxies & Cosmol, Shanghai 200030, Peoples R China
2.Shanghai Jiao Tong Univ, Ctr Astron & Astrophys, Shanghai 200240, Peoples R China
3.Univ Sci & Technol China, Key Lab Res Galaxies & Cosmol, Hefei 230026, Anhui, Peoples R China
4.Univ Massachusetts, Dept Astron, Amherst, MA 01003 USA
5.Acad Sinica, Purple Mt Observ, Nanjing 210008, Peoples R China
6.Yale Univ, Dept Astron, New Haven, CT 06520 USA
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