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

CHALELA, MARTÍN; GARCÍA LAMBAS, DIEGO; CHALELA, MARTÍN; FOËX, GAEL; GARCÍA LAMBAS, DIEGO; RODRIGUEZ, FACUNDO; FOËX, GAEL; RODRIGUEZ, FACUNDO; MERCHÁN, MANUEL; GONZALEZ, ELIZABETH JOHANA; MERCHÁN, MANUEL; GONZALEZ, ELIZABETH JOHANA

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY

WILEY-BLACKWELL PUBLISHING, INC

Lugar: Londres; Año: 2017 p. 1348 - 1357

0035-8711

We study the mass-richness relation using galaxy catalogues and images fromthe 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 | 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 | N ) obtained independently with a straightforward procedure.