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For refcode 2002ApJ...569..720G:
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2002ApJ...569..720G Observational Mass-to-Light Ratio of Galaxy Systems from Poor Groups to Rich Clusters Marisa Girardi, Patrizia Manzato, and Marino Mezzetti Dipartimento di Astronomia, Universita degli Studi di Trieste, Via Tiepolo 11, I-34131 Trieste, Italy; girardi@ts.astro.it, manzato@ts.astro.it, mezzetti@ts.astro.it Giuliano Giuricin Dipartimento di Astronomia, Universita degli Studi di Trieste and Fusun Limboz Istanbul University, Science Faculty, Astronomy and Space Science Department, 34452 Beyazit, Istanbul, Turkey Received 2001 September 28; accepted 2001 December 27 ABSTRACT We study the mass-to-light ratio of galaxy systems from poor groups to rich clusters and present for the first time a large database for useful comparisons with theoretical predictions. We extend a previous work, where B_j_ band luminosities and optical virial masses were analyzed for a sample of 89 clusters. Here we also consider a sample of 52 more clusters, 36 poor clusters, seven rich groups, and two catalogs, of ~500 groups each, recently identified in the Nearby Optical Galaxy sample by using two different algorithms. We obtain the blue luminosity and virial mass for all systems considered. We devote a large effort to establishing the homogeneity of the resulting values, as well as to considering comparable physical regions, i.e., those included within the virial radius. By analyzing a fiducial, combined sample of 294 systems we find that the mass increases faster than the luminosity: the linear fit gives M is proportional to L_B_^1.34+/-0.03^, with a tendency for a steeper increase in the low-mass range. In agreement with the previous work, our present results are superior owing to the much higher statistical significance and the wider dynamical range covered (~10^12^-10^15^ M_sun_). We present a comparison between our results and the theoretical predictions on the relation between M/L_B_ and halo mass, obtained by combining cosmological numerical simulations and semianalytic modeling of galaxy formation. Subject headings: cosmology: observations - galaxies: clusters: general - galaxies: fundamental parameters
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