Small Scale Substructure, Collapse Time and Dynamical Friction
نویسندگان
چکیده
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 ⊙ ÷10 9 M ⊙ , taking into account the dynamical friction and the parameters on which it depends: the peaks' height ν c , the number of peaks inside a protocluster N tot multiplied by the correlation function ξ(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.
منابع مشابه
Substructure effects on the collapse of density perturbations
We solve numerically the equations of motion for the collapse of a shell of baryonic matter, made of galaxies and substructure of 10M⊙−10M⊙, falling into the central regions of a cluster of galaxies taking account of dynamical friction. We calculate the evolution of the expansion parameter, a(t), of the perturbation using a coefficient of dynamical friction, η0, calculated for a perturbation in...
متن کاملAnalytical relations concerning the collapse time in hierarchically clustered cosmological models
By means of numerical methods, we solve the equations of motion for the collapse of a shell of baryonic matter, made of galaxies and substructure falling into the central regions of a cluster of galaxies, taking into account the effect of the dynamical friction. The parameters on which the dynamical friction mainly depends are: the peaks’ height, the number of peaks inside a protocluster multip...
متن کاملThe Dynamical Evolution of Substructure
The evolution of substructure embedded in non-dissipative dark halos is studied through N-body simulations of isolated systems, both in and out of initial equilibrium, complementing cosmological simulations of the growth of structure. We determine by both analytic calculations and direct analysis of the N-body simulations the relative importance of various dynamical processes acting on the clum...
متن کاملThe influence of dynamical friction on the collapse of spherical density pertubation
We solve numerically the equations of motion for the collapse of a shell of baryonic matter falling into the central regions of a cluster of galaxies. taking into account of the presence of the substructure inducing dynamical friction. The evolution of the expansion parameter a(t) of the perturbation is calculated in spherical systems. The effect of dynamical friction is to reduce the binding r...
متن کاملEffects of dynamical evolution on the distribution of substructures
We develop a semi-analytical model that determines the evolution of the mass, position and internal structure of dark matter substructures orbiting in dark matter haloes. We apply this model to the case of the Milky Way. We focus in particular on the effects of mass loss, dynamical friction and substructure–substructure interactions, the last of which has previously been ignored in analytic mod...
متن کامل