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• W2031069403 abstract "The formation of galaxy clusters in hierarchically clustering universes is investigated by means of high-resolution N-body simulations. The simulations are performed using a newly developed multimass scheme which combines a PM code with a high-resolution N-body code. Numerical effects resulting from time-stepping and gravitational softening are investigated, as well as the influence of the simulation box size and of the assumed boundary conditions. Special emphasis is laid on the formation process and the influence of various cosmological parameters. Cosmogonies with massive neutrinos are also considered. Differences between clusters in the same cosmological model seem to dominate over differences caused by differing background cosmogony. The cosmological model can alter the time evolution of cluster collapse, but the merging pattern remains fairly similar, e.g. the number of mergers and the mass ratio of mergers. The gross properties of a halo, such as its size and total angular momentum, also evolve in a similar manner for all cosmogonies, and can be described using analytical models. It is shown that the density distribution of a halo shows a characteristic radial dependence which follows a power law with a slope of α = −1 at small radii and α = −3 at large radii, independent of the background cosmogony or the considered redshift. The shape of the density profiles follows the generic form proposed by Navarro et al. for all hierarchically clustering scenarios, and retains very little information about the formation process or the cosmological model. Only the central matter concentration of a halo is correlated with the formation time and therefore the corresponding cosmogony. We emphasize the role of non-radial motions of the halo particles in the evolution of the density profile." @default.
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• W2031069403 date "1999-10-01" @default.
• W2031069403 modified "2023-09-27" @default.
• W2031069403 title "The formation and evolution of clusters of galaxies in different cosmogonies" @default.
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• W2031069403 doi "https://doi.org/10.1046/j.1365-8711.1999.02757.x" @default.
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