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Alignment between Satellite and Central Galaxies in the SDSS DR7: Dependence on Large-scale Environment
Wang, Peng1,2,3; Luo, Yu1; Kang, Xi1; Libeskind, Noam I.2; Wang, Lei1; Zhang, Youcai4; Tempel, Elmo2,5; Guo, Quan6
2018-06-01
Source PublicationASTROPHYSICAL JOURNAL
ISSN0004-637X
Volume859Issue:2Pages:9
Corresponding AuthorWang, Peng(wangpeng@pmo.ac.cn)
AbstractThe 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.
Keywordcosmology: large-scale structure of universe galaxies: evolution galaxies: general methods: observational methods: statistical
DOI10.3847/1538-4357/aabe2b
WOS KeywordDARK-MATTER HALOES ; DIGITAL SKY SURVEY ; COSMIC WEB ; LAMBDA-CDM ; ANISOTROPIC DISTRIBUTION ; SUBHALO ACCRETION ; SPIN ALIGNMENT ; STAR-FORMATION ; DISC GALAXIES ; LOCAL GROUP
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000433938500014
PublisherIOP PUBLISHING LTD
Citation statistics
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/24077
Collection中国科学院紫金山天文台
Corresponding AuthorWang, Peng
Affiliation1.PMO, 2 West Beijing Rd, Nanjing 210008, Jiangsu, Peoples R China
2.Leibniz Inst Astrophys Potsdam AIP, Sternwarte 16, D-14482 Potsdam, Germany
3.Univ Chinese Acad Sci, Grad Sch, 19A Yuquan Rd, Beijing 100049, Peoples R China
4.Shanghai Astron Observ SHAO, Key Lab Res Galaxies & Cosmol, Nandan Rd 80, Shanghai 200030, Peoples R China
5.Univ Tartu, Tartu Observ, Observ 1, EE-61602 Toravere, Estonia
6.Shanghai Astron Observ SHAO, Nandan Rd 80, Shanghai 200030, Peoples R China
Recommended Citation
GB/T 7714
Wang, Peng,Luo, Yu,Kang, Xi,et al. Alignment between Satellite and Central Galaxies in the SDSS DR7: Dependence on Large-scale Environment[J]. ASTROPHYSICAL JOURNAL,2018,859(2):9.
APA Wang, Peng.,Luo, Yu.,Kang, Xi.,Libeskind, Noam I..,Wang, Lei.,...&Guo, Quan.(2018).Alignment between Satellite and Central Galaxies in the SDSS DR7: Dependence on Large-scale Environment.ASTROPHYSICAL JOURNAL,859(2),9.
MLA Wang, Peng,et al."Alignment between Satellite and Central Galaxies in the SDSS DR7: Dependence on Large-scale Environment".ASTROPHYSICAL JOURNAL 859.2(2018):9.
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