Evolution of the Pairwise Peculiar Velocity Distribution Function in Lagrangian Perturbation Theory

Details Evolution of the Pairwise Peculiar Velocity Distribution Function in Lagrangian Perturbation Theory Evolution of the Pairwise Peculiar Velocity Distribution Function in Lagrangian Perturbation Theory

1997-07-29

arxiv.org/abs/astro-ph/9707312v1

Astrophys.J. 492 (1998) 421

Astronomy and Astrophysics

Astrophysics

19 pages, 8 Postscript figures, AAS LaTeX

Scientific paper

10.1086/305067

The statistical distribution of the radial pairwise peculiar velocity of galaxies is known to have an exponential form as implied by observations and explicitly shown in N-body simulations. Here we calculate its statistical distribution function using the Zel'dovich approximation assuming that the primordial density fluctuations are Gaussian distributed. We show that the exponential distribution is realized as a transient phenomena on megaparsec scales in the standard cold-dark-matter model.

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