Nonlinear evolution of superclusters

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Galactic Clusters, Galactic Evolution, Astronomical Models, Nonlinear Systems, Radial Distribution, Virial Theorem

Scientific paper

A spherically symmetric model is presented for the nonlinear dynamical evolution of a supercluster in which the galaxies have a finite velocity dispersion. The model successfully accounts for many of the observed characteristics of superclusters: the density profile in the central cluster and in the outlying supercluster, the existence of a secondary density maximum, the central velocity dispersion, the peculiar inflow velocity field, and the velocity dispersion of field galaxies. It is further deduced from the model that the bulk of the mass of the central cluster is made up of galaxies which are not in hydrostatic equilibrium, but are streaming radially inward and outward, either on their initial collapse, or on their first orbit following rebound; implications for virial analyses are discussed. It is conjectured that many superclusters may be late collapsers (ac approximately 0.5). If that is the case, then there should be a detectable evolution in the density of superclusters near the collapse epoch, and possibly related phenomena in the properties of galaxies.

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