The Omega dependence of peculiar velocities induced by spherical density perturbations

Details The Omega dependence of peculiar velocities induced by spherical density perturbations The Omega dependence of peculiar velocities induced by spherical density perturbations

Dec 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apjs...74..831l&link_type=abstract

Astrophysical Journal Supplement Series (ISSN 0067-0049), vol. 74, Dec. 1990, p. 831, 832.

Statistics

Computation

46

Density Distribution, Red Shift, Space Density, Velocity Distribution, Computational Astrophysics, Perturbation Theory

Scientific paper

An attempt is made to clarify the approximate nature of the commonly used Omega exp 0.6 formulas. The velocity of a shell surrounding a spherical density perturbation with average fractional overdensity Delta rho/rho in an otherwise Friedmann universe is expanded here in powers of Delta rho/rho. An expression is obtained for the fractional velocity change of the perturbed shell.

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