Ram Pressure Stripping in Clusters and Groups

Ram pressure stripping is an important process in the evolution of both dwarfgalaxies and large spirals. Large spirals are severely stripped in richclusters and may be mildly stripped in groups. Dwarf galaxies can be severelystripped in both clusters and groups. A model is developed that describes thestripping of a satellite galaxy's outer H \textsc{i} disk and hot galactichalo. The model can be applied to a wide range of environments and satellitegalaxy masses. Whether ram pressure stripping of the outer disk or hot galactichalo occurs is found to depend primarily on the ratio of the satellite galaxymass to the mass of the host group or cluster. How the effectiveness of rampressure stripping depends on the density of the inter-group gas, the darkmatter halo concentrations, and the scale lengths and masses of the satellitecomponents is explored. The predictions of the model are shown to be wellmatched to H \textsc{i} observations of spirals in a sample of nearby clusters.The model is used to predict the range of H \textsc{i} gas fractions asatellite of mass $M_{v,sat}$ can lose orbiting in a cluster of mass$M_{v,gr}$.Comment: 13 Pages, 3 figure