Theoretical Predictions of Colors and Metallicity of the Intracluster Light

doi:10.3847/1538-4357/aaf41f

	Theoretical Predictions of Colors and Metallicity of the Intracluster Light
	Contini, E.1,2; Yi, S. K.1,2; Kang, X.3
刊名	ASTROPHYSICAL JOURNAL
	2019-01-20
卷号	871 期号:1 页码:10
关键词	galaxies: clusters: general
ISSN号	0004-637X
DOI	10.3847/1538-4357/aaf41f
通讯作者	Contini, E.(contini@pmo.ac.cn)
英文摘要	We 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.
WOS关键词	BRIGHTEST CLUSTER GALAXIES ; STARS ; STELLAR ; SIMULATIONS ; NEBULAE ; MERGERS ; ORIGIN
WOS研究方向	Astronomy & Astrophysics
语种	英语
出版者	IOP PUBLISHING LTD
WOS记录号	WOS:000456266200011
内容类型	期刊论文
源URL	[http://libir.pmo.ac.cn/handle/332002/19200]
专题	中国科学院紫金山天文台
通讯作者	Contini, E.
作者单位	1.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
推荐引用方式 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.