Properties of galaxy groups in the Sloan Digital Sky Survey - II. Active galactic nucleus feedback and star formation truncation

	Properties of galaxy groups in the Sloan Digital Sky Survey - II. Active galactic nucleus feedback and star formation truncation
	Weinmann, Simone M.; van den Bosch, Frank C.; Yang, Xiaohu ; Mo, H. J.; Croton, Darren J.; Moore, Ben
刊名	MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
	2006-11-01
卷号	372 期号:3 页码:1161-1174
关键词	methods : statistical galaxies : evolution galaxies : formation galaxies : general galaxies : statistics
英文摘要	Successfully reproducing the galaxy luminosity function (LF) and the bimodality in the galaxy distribution requires a mechanism that can truncate star formation in massive haloes. Current models of galaxy formation consider two such truncation mechanisms: strangulation, which acts on satellite galaxies, and active galactic nucleus (AGN) feedback, which predominantly affects central galaxies. The efficiencies of these processes set the blue fraction of galaxies, f(blue)(L, M), as a function of galaxy luminosity, L, and halo mass, M. In this paper, we use a galaxy group catalogue extracted from the Sloan Digital Sky Survey (SDSS) to determine f(blue)(L, M). To demonstrate the potential power of these data as a benchmark for galaxy formation models, we compare the results to the semi-analytical model for galaxy formation of Croton et al. Although this model accurately fits the global statistics of the galaxy population, as well as the shape of the conditional LF, there are significant discrepancies when the blue fraction of galaxies as a function of mass and luminosity is compared between the observations and the model. In particular, the model predicts (i) too many faint satellites in massive haloes, (ii) a blue fraction of satellites that is much too low, and (iii) a blue fraction of centrals that is too high and with an inverted luminosity dependence. In the same order, we argue that these discrepancies owe to (i) the neglect of tidal stripping in the semi-analytical model, (ii) the oversimplified treatment of strangulation, and (iii) improper modelling of dust extinction and/or AGN feedback. The data presented here will prove useful to test and calibrate future models of galaxy formation and, in particular, to discriminate between various models for AGN feedback and other star formation truncation mechanisms.
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	Astronomy & Astrophysics
关键词[WOS]	DARK-MATTER HALOES ; COLOR-MAGNITUDE RELATION ; SURVEY IMAGING DATA ; LUMINOSITY FUNCTION ; REDSHIFT SURVEY ; COOLING FLOWS ; BLACK-HOLES ; ENVIRONMENTAL DEPENDENCE ; SYSTEMATIC PROPERTIES ; ELLIPTIC GALAXIES
收录类别	SCI
语种	英语
WOS记录号	WOS:000241389400017
内容类型	期刊论文
源URL	[http://119.78.226.72/handle/331011/19329]
专题	上海天文台_星系宇宙学重点实验室
作者单位	1.Univ Zurich, Inst Theoret Phys, CH-8057 Zurich, Switzerland 2.Max Planck Inst Astron, D-69117 Heidelberg, Germany 3.Shanghai Astron Observ, Shanghai 200030, Peoples R China 4.Univ Massachusetts, Dept Astron, Amherst, MA 01003 USA 5.Univ Calif Berkeley, Dept Astron, Berkeley, CA 94720 USA
推荐引用方式 GB/T 7714	Weinmann, Simone M.,van den Bosch, Frank C.,Yang, Xiaohu,et al. Properties of galaxy groups in the Sloan Digital Sky Survey - II. Active galactic nucleus feedback and star formation truncation[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2006,372(3):1161-1174.
APA	Weinmann, Simone M.,van den Bosch, Frank C.,Yang, Xiaohu,Mo, H. J.,Croton, Darren J.,&Moore, Ben.(2006).Properties of galaxy groups in the Sloan Digital Sky Survey - II. Active galactic nucleus feedback and star formation truncation.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,372(3),1161-1174.
MLA	Weinmann, Simone M.,et al."Properties of galaxy groups in the Sloan Digital Sky Survey - II. Active galactic nucleus feedback and star formation truncation".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 372.3(2006):1161-1174.