Astronomy and Astrophysics – Astrophysics
Scientific paper
1993-10-06
Astronomy and Astrophysics
Astrophysics
26 pages plus 13 figures (4 of which, not included, available upon request to serna@frmeu51.bitnet), postscript, Preprint OP-9
Scientific paper
10.1086/174168
We have performed a series of N-body experiments on Connection Machine-5 in order to simulate the formation of galaxy clusters gravitationally dominated by a massive dark background. In accordance with previous authors we find an extremely inhomogeneous evolution where subcondensations are continually formed and merged. The final distribution of galaxies is more centrally condensed than that of dark matter particles. We have analyzed the origin of this galaxy-dark matter segregation and also the origin of subclustering leading to this effect. We have then analysed, analytically and numerically, the dependence of final segregation on the physical parameters characterizing the model of protocluster. We also find that such a segregation persists even when inelastic encounters of dark halos around galaxies are taken into account. We conclude that this effect cannot be in general avoided in any hierarchical clustering scenario.
Alimi Jean--Michel
Scholl Hans
Serna Ainhoa
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