Mass-to-light ratios of ellipticals in LCDM
Abstract
We use the mass-to-light gradients in early-type galaxies to infer the global dark matter fraction, fd=Md/M*, for these systems. We discuss implications about the total star formation efficiency in dark-matter halos and show that the trend of f d with mass produces virial mass-to-light ratios which are consistent with semi-analitical models. Preliminary kurtosis analysis of the quasi-constant M/L galaxies in Romanowsky et al. seems at odd with Dekel et al. simulations.
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