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

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

Aug 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003mnras.343.1038y&link_type=abstract

Monthly Notice of the Royal Astronomical Society, Volume 343, Issue 3, pp. 1038-1044.

Astronomy and Astrophysics

Astronomy

4

Cosmology: Theory, Large-Scale Structure Of Universe

Scientific paper

According to N-body numerical simulations, the radial pairwise velocities of galaxies have negative skewness in the quasi-non-linear 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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