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Major dry mergers in early-type brightest cluster galaxies
Liu, F. S.1,2; Mao, Shude3; Deng, Z. G.4; Xia, X. Y.5; Wen, Z. L.2
2009-07-11
发表期刊MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷号396期号:4页码:2003-2010
摘要We search for ongoing major dry mergers in a well-selected sample of local brightest cluster galaxies (BCGs) from the C4 cluster catalogue. 18 out of 515 early-type BCGs with redshift between 0.03 and 0.12 are found to be in major dry mergers, which are selected as pairs (or triples) with r-band magnitude difference delta m(r) < 1.5 and projected separation r(p) < 30 kpc, and showing signatures of interaction in the form of significant asymmetry in residual images. We find that the fraction of BCGs in major dry mergers increases with the richness of the clusters, consistent with the fact that richer clusters usually have more massive (or luminous) BCGs. We estimate that present-day early-type BCGs may have experienced on average similar to 0.6 (t(merge)/0.3 Gyr)(-1) major dry mergers and through this process increases their luminosity (mass) by 15 per cent (t(merge)/0.3 Gyr)(-1) (f(mass)/0.5) on average since z = 0.7, where t(merge) is the merging time-scale and f(mass) is the mean mass fraction of companion galaxies added to the central ones. We also find that major dry mergers do not seem to elevate radio activities in BCGs. Our study shows that major dry mergers involving BCGs in clusters of galaxies are not rare in the local Universe, and they are an important channel for the formation and evolution of BCGs.
关键词Galaxies: Clusters: General Galaxies: Elliptical And Lenticular Cd Galaxies: Photometry
DOI10.1111/j.1365-2966.2009.14907.x
收录类别SCI
语种英语
WOS记录号WOS:000267710400013
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文献类型期刊论文
条目标识符http://ir.bao.ac.cn/handle/114a11/8072
专题射电天文研究部
作者单位1.Shenyang Normal Univ, Coll Phys Sci & Technol, Shenyang 110034, Peoples R China
2.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
3.Univ Manchester, Jodrell Bank, Ctr Astrophys, Manchester M13 9PL, Lancs, England
4.Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China
5.Tianjin Normal Univ, Tianjin Astrophys Ctr, Tianjin 300074, Peoples R China
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Liu, F. S.,Mao, Shude,Deng, Z. G.,et al. Major dry mergers in early-type brightest cluster galaxies[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2009,396(4):2003-2010.
APA Liu, F. S.,Mao, Shude,Deng, Z. G.,Xia, X. Y.,&Wen, Z. L..(2009).Major dry mergers in early-type brightest cluster galaxies.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,396(4),2003-2010.
MLA Liu, F. S.,et al."Major dry mergers in early-type brightest cluster galaxies".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 396.4(2009):2003-2010.
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