On the reliability of Virgo infall in estimating the mass density of the Universe

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Abstract
The infall velocities of particles in matter-dominated gravitational Universe simulations with the density parameter Ω= 1 are studied in an effort to determine the reliability of estimating Ω from infall to clusters. It is shown that such methods often err by a factor of 2 or more, even when light faithfully traces mass. Furthermore, the value Ω=0 is often within one standard deviation in an Ω=1 Universe model.