Fitting a Self-Interacting Dark Matter Model to Data Ranging From Satellite Galaxies to Galaxy Clusters

Abstract

We present a fit to observational data in an asymmetric self-interacting dark matter model using our recently calculated cross sections that incorporate both t-channel and u-channel exchanges in the scattering of identical particles. We find good fits to the data ranging from dwarf galaxies to galaxy clusters, and equivalent relative velocities from ∼ 20 km/sec to > ∼ 10 3 km/s. We compare our results with previous fits that used only t-channel exchange contributions to the scattering.