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Are brightest halo galaxies central galaxies?

文献类型：期刊论文

作者Skibba, Ramin A.1,2; van den Bosch, Frank C.3; Yang, Xiaohu4; More, Surhud1,5; Mo, Houjun6; Fontanot, Fabio1,7
刊名MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
出版日期2011
卷号410期号:1页码:417-431
关键词methods: statistical galaxies: clusters: general galaxies: haloes galaxies: kinematics and dynamics dark matter
英文摘要It is generally assumed that the central galaxy in a dark matter halo, that is the galaxy with the lowest specific potential energy, is also the brightest halo galaxy (BHG), and that it resides at rest at the centre of the dark matter potential well. This central galaxy paradigm (CGP) is an essential assumption made in various fields of astronomical research. In this paper, we test the validity of the CGP using a large galaxy group catalogue constructed from the Sloan Digital Sky Survey. For each group, we compute two statistics, and , which quantify the offsets of the line-of-sight velocities and projected positions of brightest group galaxies relative to the other group members. By comparing the cumulative distributions of and to those obtained from detailed mock group catalogues, we rule out the null hypothesis that the CGP is correct. Rather, the data indicate that in a non-zero fraction f(BNC)(M) of all haloes of mass M the BHG is not the central galaxy, but instead a satellite galaxy. In particular, we find that f(BNC) increases from similar to 0.25 in low-mass haloes (1012 h-1 < M less than or similar to 2 x 1013 h-1 M-circle dot) to similar to 0.4 in massive haloes (M greater than or similar to 5 x 1013 h-1 M-circle dot). We show that these values of f(BNC) are uncomfortably high compared to predictions from halo occupation statistics and from semi-analytical models of galaxy formation. We end by discussing various implications of a non-zero f(BNC)(M), with an emphasis on the halo masses inferred from satellite kinematics.
WOS标题词Science & Technology ; Physical Sciences
类目[WOS]Astronomy & Astrophysics
研究领域[WOS]Astronomy & Astrophysics
关键词[WOS]DIGITAL SKY SURVEY ; DARK-MATTER HALOES ; STELLAR MASS FUNCTIONS ; LUMINOUS RED GALAXIES ; K-BAND PROPERTIES ; SATELLITE GALAXIES ; CLUSTER GALAXIES ; CROSS-CORRELATION ; REDSHIFT SURVEY ; PECULIAR VELOCITIES
收录类别SCI
语种英语
WOS记录号WOS:000285250400032
源URL[http://119.78.226.72/handle/331011/26422]  
专题上海天文台_星系宇宙学重点实验室
作者单位1.Max Planck Inst Astron, D-69117 Heidelberg, Germany
2.Univ Arizona, Steward Observ, Tucson, AZ 85721 USA
3.Univ Utah, Dept Phys & Astron, Salt Lake City, UT 84112 USA
4.Shanghai Astron Observ, Key Lab Res Galaxies & Cosmol, Shanghai 200030, Peoples R China
5.Univ Chicago, Kavli Inst Cosmol Phys, Chicago, IL 60637 USA
6.Univ Massachusetts, Dept Astron, Amherst, MA 01003 USA
7.Osserv Astron Trieste, INAF, I-34131 Trieste, Italy
推荐引用方式
GB/T 7714		 Skibba, Ramin A.,van den Bosch, Frank C.,Yang, Xiaohu,et al. Are brightest halo galaxies central galaxies?[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2011,410(1):417-431.
APA Skibba, Ramin A.,van den Bosch, Frank C.,Yang, Xiaohu,More, Surhud,Mo, Houjun,&Fontanot, Fabio.(2011).Are brightest halo galaxies central galaxies?.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,410(1),417-431.
MLA Skibba, Ramin A.,et al."Are brightest halo galaxies central galaxies?".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 410.1(2011):417-431.

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