DARK-MATTER HALO STRUCTURE IN CDM HYDRODYNAMICAL SIMULATIONS

We have carried out a comparative analysis of the properties of dark m atter haloes in N-body and hydrodynamical simulations, We analyse thei r density profiles, shapes and kinematical properties with the aim of assessing the effects that hydrodynamical processes might produce on t he evolution of the dark matter component. The simulations performed a llow us to reproduce dark matter haloes with high resolution, although the range of circular velocities is limited. We find that for haloes with circular velocities of [150-200] km s(-1) at the virial radius, t he presence of baryons affects the evolution of the dark matter compon ent in the central region, modifying the density profiles, shapes and velocity dispersions, We also analyse the rotation velocity curves of disc-like structures and compare them with observational results. (C) 1998 RAS.