Groups of galaxies in the CfA survey and in cold dark matter universes

Astronomy and Astrophysics – Astronomy

Scientific paper

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Dark Matter, Galactic Clusters, Mass Distribution, Universe, Astronomical Models, Galactic Evolution, Red Shift

Scientific paper

The authors consider the definition of groups and clusters of galaxies in magnitude-limited redshift surveys, and examine how their properties can be used to constrain the amount and distribution of matter in the Universe. The uncertainties in such analyses are greatly clarified by applying them to artificial surveys generated from fully consistent dynamical simulations of clustering. For this purpose the authors use the cold dark matter models of Davis et al., which provide a good fit to many aspects of observed clustering. These models allow the authors to optimize the selection criteria for groups and to estimate the biases inherent in observational determinations of their masses. They find that such biases are strongly dependent in survey parameters, on group definition procedure, and on the intrinsic structure of galaxy clustering.

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