Infall patterns around rich clusters of galaxies

Details Infall patterns around rich clusters of galaxies Infall patterns around rich clusters of galaxies

Sep 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989aj.....98..755r&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 98, Sept. 1989, p. 755-765. Research supported by the Smithsonian Institution and Di

Statistics

Computation

95

Cosmology, Density Distribution, Galactic Clusters, Mass Distribution, Radial Velocity, Astronomical Models, Caustics (Optics), Computational Astrophysics, Red Shift, Statistical Analysis

Scientific paper

The pattern of infall velocities induced by a rich cluster of galaxies is considered, using an infall model based on the Friedmann solution to determine the exact implicit dependence of the peculiar velocity on the density enhancment and the mean cosmological mass density, Omega(0). An analytic model for the distribution of galaxies around a cluster core in redshift space is developed. The high-density caustics in redshift space are shown to appear as envelopes around rich clusters. Assuming that the galaxies trace the matter distribution, low Omega(0) models can explain observational data obtained for four clusters. The present results support the prediction that light traces mass in the infall region.

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