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Velocity fields around rich clusters of galaxies
The Astrophysical Journal1986Vol. 308, pp. 499–499
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Abstract
The authors study the nature of the velocity field around large clusters in Ω = 1 cosmological N-body simulations that have initial conditions which produce large-scale structure reasonably consistent with observations. The purpose is to test the accuracy of the spherical infall models commonly used to measure the mass of the Virgo supercluster and to characterize the nature of the deviations from simple spherical infall. The use of a spherical model for the Virgocentric flow as a measure of Ω is shown to be subject to large systematic and random errors. A much better test is to use a local criterion, noting that local peculiar velocity tracks the direction and amplitude of the local peculiar gravitational force extremely well.