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Photometric properties and scaling relations of early-type Brightest Cluster Galaxies
Liu, F. S.1,2,3; Xia, X. Y.3; Mao, Shude3,4; Wul, Hong1; Deng, Z. G.2
2008-03-21
发表期刊MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷号385期号:1页码:23-39
摘要We investigate the photometric properties of the early-type Brightest Cluster Galaxies (BCGs) using a carefully selected sample of 85 BCGs from the C4 cluster catalogue with a redshift of less than 0.1. We perform accurate background subtractions and surface photometry for these BCGs to 25 mag arcsec(-2) in the Sloan r band. By quantitatively analysing the gradient of the Petrosian profiles of BCGs, we find that a large fraction of BCGs have extended stellar envelopes in their outskirts; more luminous BCGs tend to have more extended stellar haloes that are likely to be connected with mergers. A comparison sample of elliptical galaxies was chosen with similar apparent magnitude and redshift ranges, for which the same photometric analysis procedure is applied. We find that BCGs have steeper size-luminosity (R proportional to L(alpha)) and Faber-Jackson (L proportional to sigma(beta)) relations than the bulk of early-type galaxies. Furthermore, the power-law indices (a and,B) in these relations increase as the isophotal limits become deeper. For isophotal limits from 22 to 25 mag arcsec(-2), BCGs are usually larger than the bulk of early-type galaxies, and a large fraction (similar to 49 per cent) of BCGs have discy isophotal shapes. The differences in the scaling relations are consistent with a scenario where the dynamical structure and formation route of BCGs may be different from the bulk of early-type galaxies; in particular dry (dissipationless) mergers may play a more important role in their formation. We highlight several possible dry merger candidates in our sample.
关键词Galaxies : Clusters : General Galaxies : Elliptical And Lenticular Galaxies : Photometry Cd
DOI10.1111/j.1365-2966.2007.12818.x
收录类别SCI
语种英语
WOS记录号WOS:000254916500002
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被引频次:56[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.bao.ac.cn/handle/114a11/8370
专题光学天文研究部
作者单位1.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
2.Chinese Acad Sci, Grad Sch, Beijing 100049, Peoples R China
3.Tianjin Normal Univ, Dept Phys, Tianjin 300074, Peoples R China
4.Univ Manchester, Jodrell Bank Ctr Astrophys, Manchester M13 9PL, Lancs, England
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Liu, F. S.,Xia, X. Y.,Mao, Shude,et al. Photometric properties and scaling relations of early-type Brightest Cluster Galaxies[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2008,385(1):23-39.
APA Liu, F. S.,Xia, X. Y.,Mao, Shude,Wul, Hong,&Deng, Z. G..(2008).Photometric properties and scaling relations of early-type Brightest Cluster Galaxies.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,385(1),23-39.
MLA Liu, F. S.,et al."Photometric properties and scaling relations of early-type Brightest Cluster Galaxies".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 385.1(2008):23-39.
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