Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...269...83s&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 269, no. 1-2, p. 83-95.
Astronomy and Astrophysics
Astrophysics
29
Astronomical Models, Galactic Clusters, Galactic Evolution, Many Body Problem, Dark Matter, Velocity Distribution
Scientific paper
A series of N-body simulations of the evolution of galaxy clusters is presented. Clusters in different situations are studied: the cluster collapse, the collision of subclusters, and a steady infall of galaxies to the cluster. Collapse models were calculated with different distributions of the dark matter and different degrees of homogeneity in the initial conditions, which causes a variation in the clumping behavior and in the collapse time. With collision models optically observable quantities like the velocity dispersion were analyzed for different mass ratios of the subclusters and different distributions of the dark matter. The velocity dispersion can increase up to a factor of two during a collision. The infall models show different virialization times depending on the distribution of the dark matter. The mean distances from the center of galaxies that have fallen at different times into the cluster are distinguishable for a long time while the velocity dispersions cannot be discriminated. A detailed phase-space analysis of the virialized state was performed for all models. The model clusters were found to be nonisothermal and anisotropic. Models with different initial conditions are distinguishable still in the virialized state by their surface densities and by the anisotropy of their velocity distributions.
Boehringer Hans
Schindler Sabine
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