The Pairwise Peculiar Velocity Dispersion of Galaxies: Effects of the Infall

Details The Pairwise Peculiar Velocity Dispersion of Galaxies: Effects of the Infall The Pairwise Peculiar Velocity Dispersion of Galaxies: Effects of the Infall

1998-01-09

arxiv.org/abs/astro-ph/9801067v2

Astrophys.J. 503 (1998) 502

Astronomy and Astrophysics

Astrophysics

minor changes in the discussion; accepted for publication in ApJ; 8 pages with 2 figures included

Scientific paper

10.1086/306037

We study the reliability of the reconstruction method which uses a modelling of the redshift distortions of the two-point correlation function to estimate the pairwise peculiar velocity dispersion of galaxies. In particular, the dependence of this quantity on different models for the infall velocity is examined for the Las Campanas Redshift Survey. We make extensive use of numerical simulations and of mock catalogs derived from them to discuss the effect of a self-similar infall model, of zero infall, and of the real infall taken from the simulation. The implications for two recent discrepant determinations of the pairwise velocity dispersion for this survey are discussed.

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