Mass-to-light ratios of ellipticals in LCDM

Details Mass-to-light ratios of ellipticals in LCDM Mass-to-light ratios of ellipticals in LCDM

2005-10-19

arxiv.org/abs/astro-ph/0510568v1

Astronomy and Astrophysics

Astrophysics

5 pages, 4 figures. To appear in Proceedings of XXIst IAP Colloquium, "Mass Profiles & Shapes of Cosmological Structures" (Par

Scientific paper

10.1051/eas:2006059

We use the mass-to-light gradients in early-type galaxies to infer the global dark matter fraction, f_d=M_d/M_*, for these systems. We discuss implications about the total star formation efficiency in dark-matter halos and show that the trend of $f_{\rm d}$ 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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