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The different growth pathways of brightest cluster galaxies and intracluster light
Contini, E.1,2; Yi, S. K.1,2; Kang, X.3
2018-09-01
Source PublicationMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
ISSN0035-8711
Volume479Issue:1Pages:932-944
Abstract

We study the growth pathways of brightest central galaxies (BCGs) and intracluster light (ICE) by means of a semi-analytic model. We assume that ICL forms by stellar stripping of satellite galaxies and violent processes during mergers, and implement two independent models: One considers both mergers and stellar stripping (named STANDARD model), and the other considers only mergers (named MERGERS model). We find that BCGs and ICL form, grow, and overall evolve at different times and with different time-scales, but they show a clear coevolution after redshift z similar to 0.7-0.8. Around 90 per cent of the ICE from stellar stripping is built up in the innermost 150 kpc from the halo centre and the dominant contribution comes from disc-like galaxies (B/T < 0.4) through a large number of small/intermediate stripping events (M-strip/M-sat < 0.3). The fractions of stellar mass in BCGs and in the ICL over the total stellar mass within the virial radius of the halo evolve differently with time. At high redshift, the BCG accounts for the bulk of the mass, but its contribution gradually decreases with time and stays constant after z similar to 0.4-0.5. The ICL, instead, grows very fast and its contribution keeps increasing down to the present time. The STANDARD and MERGERS models make very similar predictions in most of the cases, but predict different amounts of ICL associated with galaxies within the virial radius of the group/cluster other than the BCG, at z = 0. We then suggest that this quantity is a valid observable that can shed light on the relative importance of mergers and stellar stripping for the formation of ICL.

Keywordgalaxy: formation galaxies: evolution
DOI10.1093/mnras/sty1518
WOS KeywordDARK-MATTER HALOES ; MASSIVE GALAXIES ; STELLAR MASS ; FORMATION MODELS ; MAJOR MERGERS ; EVOLUTION ; STARS ; Z=1 ; SIMULATIONS ; STATISTICS
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000441295800071
PublisherOXFORD UNIV PRESS
Citation statistics
Cited Times:9[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/21580
Collection中国科学院紫金山天文台
Corresponding AuthorContini, E.; Yi, S. K.; Kang, X.
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.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.. The different growth pathways of brightest cluster galaxies and intracluster light[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2018,479(1):932-944.
APA Contini, E.,Yi, S. K.,&Kang, X..(2018).The different growth pathways of brightest cluster galaxies and intracluster light.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,479(1),932-944.
MLA Contini, E.,et al."The different growth pathways of brightest cluster galaxies and intracluster light".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 479.1(2018):932-944.
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