Flux-and volume-limited groups/clusters for the SDSS galaxies: Catalogues and mass estimation

Abstract

We provide flux-and volume-limited galaxy group and cluster catalogues based on the spectroscopic sample of the galaxies of SDSS data release 10. We used a modified friends-of-friends method with a variable linking length in the transverse and radial directions to identify as many realistic groups as possible. The flux-limited catalogue incorporates galaxies down to mr = 17.77 mag. It includes 588 193 galaxies and 82458 groups. The volume-limited catalogues are complete for absolute magnitudes down to Mr,lim =-18.0,-18.5,-19.0,-19.5,-20.0,-20.5, and-21.0; the completeness is achieved within different spatial volumes. Our analysis shows that flux-and volume-limited group samples are well compatible, especially for the larger groups/clusters. Dynamical mass estimates based on radial velocity dispersions and group extent in the sky were added to the extracted groups. © ESO, 2014.