Non-Gaussian initial conditions in cosmological N-body simulations – III. Groups in Cold Dark Matter models

Abstract

Group catalogues are obtained in N-body simulations of the large-scale structure of the Universe with non-Gaussian initial conditions in a Cold Dark Matter cosmogony. Groups of particles are defined by the standard percolation algorithm with linking parameter b = 0.25 in units of the mean interparticle distance. Grouping properties are found to strongly depend on the statistics of the underlying mass distributions. By applying different tests, the clustering and the topology of the group distribution, the environmental properties of the groups and their internal geometric and dynamical features are analysed