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THE DISTRIBUTION OF SATELLITES AROUND CENTRAL GALAXIES IN A COSMOLOGICAL HYDRODYNAMICAL SIMULATION
Dong, X. C.1,2; Lin, W. P.1; Kang, X.3; Wang, Yang Ocean1,2; Dutton, Aaron A.4; Maccio, Andrea V.4
2014-08-20
Source PublicationASTROPHYSICAL JOURNAL LETTERS
Volume791Issue:2
AbstractObservations have shown that the spatial distribution of satellite galaxies is not random, but rather is aligned with the major axes of central galaxies (CGs). The strength of the alignment is dependent on the properties of both the satellites and centrals. Theoretical studies using dissipationless N-body simulations are limited by their inability to directly predict the shape of CGs. Using hydrodynamical simulations including gas cooling, star formation, and feedback, we carry out a study of galaxy alignment and its dependence on the galaxy properties predicted directly from the simulations. We found that the observed alignment signal is well produced, as is the color dependence: red satellites and red centrals both show stronger alignments than their blue counterparts. The reason for the stronger alignment of red satellites is that most of them stay in the inner region of the dark matter halo where the shape of the CG better traces the dark matter distribution. The dependence of alignment on the color of CGs arises from the halo mass dependence, since the alignment between the shape of the central stellar component and the inner halo increases with halo mass. We also find that the alignment of satellites is most strongly dependent on their metallicity, suggesting that the metallicity of satellites, rather than color, is a better tracer of galaxy alignment on small scales. This could be tested in future observational studies.
KeywordDark Matter Galaxies: Formation Galaxies: Halos Methods: Numerical Methods: Statistical
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1088/2041-8205/791/2/L33
WOS KeywordMILKY-WAY ; SPATIAL-DISTRIBUTION ; DISC GALAXIES ; ALIGNMENT ; ORIENTATION ; STELLAR ; HALOES ; POPULATION ; COMPANIONS ; RESOLUTION
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000341306200015
Citation statistics
Cited Times:22[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/15682
Collection南极天文中心
Affiliation1.Chinese Acad Sci, Shanghai Astron Observ, Key Lab Res Galaxies & Cosmol, Shanghai 200030, Peoples R China
2.Univ Chinese Acad Sci, Grad Sch, Beijing 100049, Peoples R China
3.Purple Mt Observ, Partner Grp MPI Astron, Nanjing 210008, Jiangsu, Peoples R China
4.Max Planck Inst Astron, D-69117 Heidelberg, Germany
Recommended Citation
GB/T 7714
Dong, X. C.,Lin, W. P.,Kang, X.,et al. THE DISTRIBUTION OF SATELLITES AROUND CENTRAL GALAXIES IN A COSMOLOGICAL HYDRODYNAMICAL SIMULATION[J]. ASTROPHYSICAL JOURNAL LETTERS,2014,791(2).
APA Dong, X. C.,Lin, W. P.,Kang, X.,Wang, Yang Ocean,Dutton, Aaron A.,&Maccio, Andrea V..(2014).THE DISTRIBUTION OF SATELLITES AROUND CENTRAL GALAXIES IN A COSMOLOGICAL HYDRODYNAMICAL SIMULATION.ASTROPHYSICAL JOURNAL LETTERS,791(2).
MLA Dong, X. C.,et al."THE DISTRIBUTION OF SATELLITES AROUND CENTRAL GALAXIES IN A COSMOLOGICAL HYDRODYNAMICAL SIMULATION".ASTROPHYSICAL JOURNAL LETTERS 791.2(2014).
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