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首页> 美国政府科技报告 >Cross-Correlation Weak Lensing of SDSS Galaxy Clusters II: Cluster Density Profiles and the Mass-Richness Relation
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Cross-Correlation Weak Lensing of SDSS Galaxy Clusters II: Cluster Density Profiles and the Mass-Richness Relation

机译：sDss星系团簇的互相关弱传导II：团簇密度剖面和质量丰富度关系

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摘要

We interpret and model the statistical weak lensing measurements around 130,000 groups and clusters of galaxies in the Sloan Digital Sky Survey presented by Sheldon et al. (2007). We present non-parametric inversions of the 2D shear profiles to the mean 3D cluster density and mass profiles in bins of both optical richness and cluster i-band luminosity. Since the mean cluster density profile is proportional to the cluster-mass correlation function, the mean profile is spherically symmetric by the assumptions of large-scale homogeneity and isotropy. We correct the inferred 3D profiles for systematic effects, including non-linear shear and the fact that cluster halos are not all precisely centered on their brightest galaxies. We also model the measured cluster shear profile as a sum of contributions from the brightest central galaxy, the cluster dark matter halo, and neighboring halos. We infer the relations between mean cluster virial mass and optical richness and luminosity over two orders of magnitude in cluster mass; the virial mass at fixed richness or luminosity is determined with a precision of

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