2015ApJ...800..122S -
Astrophys. J., 800, 122 (2015/February-3)
Revised mass-to-light ratios for nearby galaxy groups and clusters.
SHAN Y., McDONALD M. and COURTEAU S.
Abstract (from CDS):
We present a detailed investigation of the cluster stellar mass-to-light (M*/L) ratio and cumulative stellar masses, derived on a galaxy-by-galaxy basis, for 12 massive (M500∼ 1014-1015 M☉), nearby clusters with available optical imaging data from the Sloan Digital Sky Survey Data Release 10 and X-ray data from the Chandra X-ray Observatory. Our method involves a statistical cluster membership using both photometric and spectroscopic redshifts when available to maximize completeness while minimizing contamination effects. We show that different methods of estimating the stellar mass-to-light ratio from observed photometry result in systematic discrepancies in the total stellar masses and average mass-to-light ratios of cluster galaxies. Nonetheless, all conversion methodologies point to a lack of correlation between M*/Li and total cluster mass, even though low-mass groups contain relatively more blue galaxies. We also find no statistically significant correlation between M*/Liand the fraction of blue galaxies (g - i < 0.85). For the mass range covered by our sample, the assumption of a Chabrier initial mass function (IMF) yields an integrated M*/Li≃ 1.7±0.2 M☉/L_i, ☉_, a lower value than used in most similar studies, though consistent with the study of low-mass galaxy groups by Leauthaud et al. A light (diet) Salpeter IMF would imply a ∼60% increase in M*/Li.
Abstract Copyright:
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Journal keyword(s):
galaxies: clusters: general - galaxies: groups: general - galaxies: photometry - galaxies: statistics - galaxies: stellar content
Simbad objects:
12
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