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题名: Alignment between Satellite and Central Galaxies in the SDSS DR7: Dependence on Large-scale Environment
作者: Wang, Peng; Luo, Yu; Kang, Xi; Libeskind, Noam I.; Wang, Lei; Zhang, Youcai; Tempel, Elmo; Guo, Quan
刊名: ASTROPHYSICAL JOURNAL
出版日期: 2018
卷号: 859, 期号:2, 页码:115
英文摘要: The alignment between satellites and central galaxies has been studied in detail both in observational and theoretical works. The widely accepted fact is that satellites preferentially reside along the major axis of their central galaxy. However, the origin and large-scale environmental dependence of this alignment are still unknown. In an attempt to determine these variables, we use data constructed from Sloan Digital Sky Survey DR7 to investigate the large-scale environmental dependence of this alignment with emphasis on examining the alignment's dependence on the color of the central galaxy. We find a very strong large-scale environmental dependence of the satellite-central alignment (SCA) in groups with blue centrals. Satellites of blue centrals in knots are preferentially located perpendicular to the major axes of the centrals, and the alignment angle decreases with environment, namely, when going from knots to voids. The alignment angle strongly depends on the (0.1)(g - r) color of centrals. We suggest that the SCA is the result of a competition between satellite accretion within large-scale structure (LSS) and galaxy evolution inside host halos. For groups containing red central galaxies, the SCA is mainly determined by the evolution effect, while for blue central dominated groups, the effect of the LSS plays a more important role, especially in knots. Our results provide an explanation for how the SCA forms within different large-scale environments. The perpendicular case in groups and knots with blue centrals may also provide insight into understanding similar polar arrangements, such as the formation of the Milky Way and Centaurus A's satellite system.
语种: 英语
WOS记录号: WOS:000433938500014
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内容类型: 期刊论文
URI标识: http://libir.pmo.ac.cn/handle/332002/18063
Appears in Collections:星系宇宙学和暗能量研究团组_期刊论文

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