Negative skewness of radial pairwise velocity in the quasi-nonlinear regime: Zel'dovich approximation

Details Negative skewness of radial pairwise velocity in the quasi-nonlinear regime: Zel'dovich approximation Negative skewness of radial pairwise velocity in the quasi-nonlinear regime: Zel'dovich approximation

2001-10-05

arxiv.org/abs/astro-ph/0110137v2

Astronomy and Astrophysics

Astrophysics

11 pages, to appear in Monthly Notices of the Royal Astronomical Society

Scientific paper

According to N-body numerical simulations, the radial pairwise velocities of galaxies have negative skewness in the quasi-nonlinear regime. To understand its origin, we calculate the probability distribution function of the radial pairwise velocity using the Zel'dovich approximation, i.e., an analytical approximation for gravitational clustering. The calculated probability distribution function is in good agreement with the result of N-body simulations. Thus the negative skewness originates in relative motions of galaxies in the clustering process that the infall dominates over the expansion.

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