The Spatial Distribution of Dark Matter in the Coma Cluster

Dark matter in clusters can be either more or less centrally concentrated than galaxies, depending on whether it was once bound to galaxies in halos. If the distributions of galaxies and dark matter are represented by similar profiles, but with different core radii, then the radial variation of the velocity dispersion in the Coma cluster and the degree of efficiency of gravitational drag on galaxies are somewhat more consistent with the dark matter being more centrally concentrated than galaxies.