Weak lensing measurement of the mass-richness relation using the SDSS database

Abstract

We study the mass-richness relation using galaxy catalogues and images from the Sloan Digital Sky Survey. We use two independent methods, in the first one, we calibrate the scaling relation with weak-lensing mass estimates. In the second procedure we apply a background subtraction technique to derive the probability distribution, $P(M\mid N)$, that groups with $N$-members have a virialized halo mass $M$. Lensing masses are derived in different richness bins for two galaxy systems sets: the maxBCG catalogue and a catalogue based on a group finder algorithm developed by Yang et al. MaxBCG results are used to test the lensing methodology. The lensing mass-richness relation for the Yang et al. group sample shows a good agreement with $P(M\mid N)$ obtained independently with a straightforward procedure.

Accepted for publication in MNRAS, 11 pages, 5 figures, 2 tables

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Cited by in corpus (1)

• Compact Groups analysis using weak gravitational lensing