Small scale substructure, collapse time and dynamical friction

Details Small scale substructure, collapse time and dynamical friction Small scale substructure, collapse time and dynamical friction

1996-11-18

arxiv.org/abs/astro-ph/9611132v1

Astronomy and Astrophysics

Astrophysics

8 pages and 4 figures,(Latex), To appear in "Dark and visible matter in galaxies and cosmological implications" eds. M. Persic

Scientific paper

We solve numerically the equations of motion for the collapse of a shell of baryonic matter, made of galaxies and substructure of $ 10^{6} M_{\odot} \div 10^{9} M_{\odot}$, taking into account the dynamical friction and the parameters on which it depends: the peaks' height $\nu_{c}$, the number of peaks inside a protocluster $N_{tot}$ multiplied by the correlation function $\xi (r)$ evaluated at r=0, the filtering radius $R_{f}$ and the core radius of the cluster of galaxies, r_0. We show how the collapse time of a shell of baryonic matter depends on those parameters.

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