Dwarf galaxies in Hickson Compact Groups
  We observed 5 Hickson Compact Groups with the ESO/MPI 2.2m telescope and WFI to investigate the dwarf galaxy content and distribution in these galaxy groups. Our deep imaging and careful selection of the candidate galaxies revealed a rich population of mainly passively evolving dwarf galaxies, which is spatially much more extended than the originally defined Hickson Compact groups. The composite luminosity function of the 5 groups shows a bimodal structure with a very steep rise in the low luminosity regime. The faint end slope is close to the predictions of CDM theory for the slope of the Dark Matter halo mass function. 
Dominik Bomans (1), Elvira Krusch (1), Ralf-Juergen Dettmar (1),   Volker Mueller (2), Chris Taylor (3) ((1) Astronomical In...