IS THE DENSITY DISTRIBUTION OF CLUSTERS NON-GAUSSIAN?
Kolatt, Tsafrir
Original · EN
The one-point probability distribution function (pdf) is computed for the 25-smoothed density field of rich clusters of galaxies in the Abell/catalogs. The observed pdf is compared to the pdf s drawn similarly from mock catalogs of clusters in cosmological simulations of Gaussian and several non-Gaussian initial conditions. Several statistics allow significant rejection of the non-Gaussian models tested here, and fail to reject the Gaussian model. A comparison with the predictions of second-order perturbation theory and a log-normal model for cdm Gaussian initial conditions yield a linear biasing factor bc/bₒ ≃ 4 and bc/bₒ≃ 3.7 for R≥ 0 clusters.
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