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Theoretical Predictions of Colors and Metallicity of the Intracluster Light
Contini, E.1,2; Yi, S. K.1,2; Kang, X.3
2019-01-20
Source PublicationASTROPHYSICAL JOURNAL
ISSN0004-637X
Volume871Issue:1Pages:10
Corresponding AuthorContini, E.(contini@pmo.ac.cn)
AbstractWe study the colors and metallicities of the brightest cluster galaxies (BCGs) and intracluster light (ICL) in galaxy groups and clusters, as predicted by a semi-analytic model of galaxy formation, coupled with a set of high-resolution N-body simulations. The model assumes stellar stripping and violent relaxation processes during galaxy mergers to be the main channels for the formation of the ICL. We find that BCGs are more metal-rich and redder than the ICL, at all redshifts once the ICL starts to form (z similar to 1). In good agreement with several observed data, our model predicts negative radial metallicity and color gradients in the BCG+ICL system. By comparing the typical colors of the ICL with those of satellite galaxies, we find that the mass and metals in the ICL come from galaxies of different mass, depending on the redshift. Stripping of low-mass galaxies, 9 < logM(*) < 10, is the most important contributor in the early stages of ICL formation, but the bulk of the mass/metals contents are given by intermediate/massive galaxies, 10 < logM(*) < 11, at lower redshift. Our analysis supports the idea that stellar stripping is more important than galaxy mergers in building up the ICL, and highlights the importance of colors/metallicity measurements for understanding the formation and evolution of the ICL.
Keywordgalaxies: clusters: general
DOI10.3847/1538-4357/aaf41f
WOS KeywordBRIGHTEST CLUSTER GALAXIES ; STARS ; STELLAR ; SIMULATIONS ; NEBULAE ; MERGERS ; ORIGIN
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000456266200011
PublisherIOP PUBLISHING LTD
Citation statistics
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/19201
Collection中国科学院紫金山天文台
Corresponding AuthorContini, E.
Affiliation1.Yonsei Univ, Dept Astron, Yonsei Ro 50, Seoul 03722, South Korea
2.Yonsei Univ, Yonsei Univ Observ, Yonsei Ro 50, Seoul 03722, South Korea
3.MPI Astron, Partner Grp, Purple Mt Observ, 2 West Beijing Rd, Nanjing 210008, Jiangsu, Peoples R China
Recommended Citation
GB/T 7714
Contini, E.,Yi, S. K.,Kang, X.. Theoretical Predictions of Colors and Metallicity of the Intracluster Light[J]. ASTROPHYSICAL JOURNAL,2019,871(1):10.
APA Contini, E.,Yi, S. K.,&Kang, X..(2019).Theoretical Predictions of Colors and Metallicity of the Intracluster Light.ASTROPHYSICAL JOURNAL,871(1),10.
MLA Contini, E.,et al."Theoretical Predictions of Colors and Metallicity of the Intracluster Light".ASTROPHYSICAL JOURNAL 871.1(2019):10.
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