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

Abstract

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.

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

References in corpus (3)

• Spatial correlation function and pairwise velocity dispersion of galaxies: CDM models versus the Las Campanas Survey
• The Pairwise Velocity Distribution of Galaxies in the Las Campanas Redshift Survey
• Evolution of the Pairwise Peculiar Velocity Distribution Function in Lagrangian Perturbation Theory

Cited by in corpus (13)

• Redshift-Space Distortions, Pairwise Velocities and Nonlinearities
• The Bispectrum as a Signature of Gravitational Instability in Redshift-Space
• Velocity bias in a LCDM model
• Effect of Internal Flows on Sunyaev-Zeldovich Measurements of Cluster Peculiar Velocities
• Galaxy Clustering and Large-Scale Structure from z = 0.2 to z = 0.5 in Two Norris Redshift Surveys
• Taking advantage of photometric galaxy catalogues to determine the halo occupation distribution
• The Pairwise Velocity Distribution Function of Galaxies in the LCRS, 2dF, and SDSS Redshift Surveys
• Galaxy Correlation Statistics of Mock Catalogs for the DEEP2 Survey
• The Galaxy-Weighted Small-Scale Velocity Dispersion of the Las Campanas Redshift Survey
• Weak lensing measurement of the mass-richness relation using the SDSS database
• Modeling non-linear effects in the redshift space two-point correlation function and its implications for the pairwise velocity dispersion
• Nonlinear Velocity-Density Coupling: Analysis by Second-Order Perturbation Theory
• The pair-wise velocity dispersion of galaxies: effects of non radial motions