Galaxy clustering and galaxy-galaxy lensing: a promising union to constrain cosmological parameters

	Galaxy clustering and galaxy-galaxy lensing: a promising union to constrain cosmological parameters
	Cacciato, Marcello 1; van den Bosch, Frank C.1; More, Surhud 1; Li, Ran 2,3; Mo, H. J.2; Yang, Xiaohu 4
刊名	MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
	2009-04-01
卷号	394 期号:2 页码:929-946
关键词	gravitational lensing methods: statistical galaxies: haloes cosmological parameters dark matter large-scale structure of Universe
英文摘要	Galaxy clustering and galaxy-galaxy lensing probe the connection between galaxies and their dark matter haloes in complementary ways. Since the clustering of dark matter haloes depends on cosmology, the halo occupation statistics inferred from the observed clustering properties of galaxies are degenerate with the adopted cosmology. Consequently, different cosmologies imply different mass-to-light ratios for dark matter haloes. Galaxy-galaxy lensing, which yields direct constraints on the actual mass-to-light ratios, can therefore be used to break this degeneracy, and thus to constrain cosmological parameters. In this paper, we establish the link between galaxy luminosity and dark matter halo mass using the conditional luminosity function (CLF), Phi(L\M) dL, which gives the number of galaxies with luminosities in the range L +/- dL/2 that reside in a halo of mass M. We constrain the CLF parameters using the galaxy luminosity function and the luminosity dependence of the correlation lengths of galaxies. The resulting CLF models are used to predict the galaxy-galaxy lensing signal. For a cosmology that agrees with constraints from the cosmic microwave background, i.e. (Omega(m), sigma(8)) = (0.238, 0.734), the model accurately fits the galaxy-galaxy lensing data obtained from the Sloan Digital Sky Survey. For a comparison cosmology with (Omega(m), sigma(8)) = (0.3, 0.9), however, we can accurately fit the luminosity function and clustering properties of the galaxy population, but the model predicts mass-to-light ratios that are too high, resulting in a strong overprediction of the galaxy-galaxy lensing signal. We conclude that the combination of galaxy clustering and galaxy-galaxy lensing is a powerful probe of the galaxy-dark matter connection, with the potential to yield tight constraints on cosmological parameters. Since this method mainly probes the mass distribution on relatively small (non-linear) scales, it is complementary to constraints obtained from the galaxy power spectrum, which mainly probes the large-scale (linear) matter distribution.
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 ; DIGITAL SKY SURVEY ; MASS-LUMINOSITY-RELATION ; PROBE WMAP OBSERVATIONS ; CROSS-CORRELATION ; REDSHIFT SURVEY ; OCCUPATION DISTRIBUTION ; SATELLITE KINEMATICS ; DISSIPATIONLESS SIMULATIONS ; RADIAL-DISTRIBUTION
收录类别	SCI
语种	英语
WOS记录号	WOS:000264242000028
内容类型	期刊论文
源URL	[http://119.78.226.72/handle/331011/19567]
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 Massachusetts, Dept Astron, Amherst, MA 01003 USA 3.Peking Univ, Dept Astron, Beijing 100871, Peoples R China 4.Shanghai Astron Observ, Shanghai 200030, Peoples R China
推荐引用方式 GB/T 7714	Cacciato, Marcello,van den Bosch, Frank C.,More, Surhud,et al. Galaxy clustering and galaxy-galaxy lensing: a promising union to constrain cosmological parameters[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2009,394(2):929-946.
APA	Cacciato, Marcello,van den Bosch, Frank C.,More, Surhud,Li, Ran,Mo, H. J.,&Yang, Xiaohu.(2009).Galaxy clustering and galaxy-galaxy lensing: a promising union to constrain cosmological parameters.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,394(2),929-946.
MLA	Cacciato, Marcello,et al."Galaxy clustering and galaxy-galaxy lensing: a promising union to constrain cosmological parameters".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 394.2(2009):929-946.