Dissipative N-Body Simulations of CDM Cosmologies

A dissipative N-body code is used to follow the evolution of an Ω = 1, h = 0.5 Cold Dark Matter spectrum in cubes of 40, 80 and 200 Mpc on a side. Half of the 524288 particles, comprising one eleventh of the total mass, are treated as a gas that can cool and turn into stars. We find that the the bias present in the model, at the time identified as the present, is relatively small. The pairwise velocities on small scales are a factor two smaller in the galaxies than in the dark matter. Mergers are found to play an important role in distinguishing the histories of galaxies and dark matter haloes.