2004/07/05 by H. Andernach, Andernach, H., M. Plionis +9
Physics and Astronomy · #Astronomy and Astrophysical Research #Galaxies: Formation, Evolution, Phenomena #Stellar, planetary, and galactic studies #astro-ph
paper · pdf · doi:10.48550/arxiv.astro-ph/0407098
4 pages, no figures, uses asp2004.sty; to appear in "Nearby Large-Scale Structures and the Zone of Avoidance", eds. A.P. Fairall, P. Woudt, ASP Conf. Series, en prensa, San Francisco: Astronomical Society of the Pacific
arxiv created 2004/07/05 · arxiv updated 2009/12/01
From an up-to-date compilation of ACO cluster redshifts and velocity dispersions we extract a homogeneous sample of 459 clusters with robust velocity dispersion. Using the virial theorem to estimate cluster masses, and a correlation between Abell galaxy counts and R-band luminosity, we find a median M/LR of 174 h50 Msun/Lsun. However, if we correct the virial masses according to the X-ray vs. virial mass correlation, as derived from our analysis, we obtain M/LR ~100 h50 Msun/Lsun. These two values of M/L imply a mass content of the Universe of Omegam ~0.26 and 0.15, respectively.