A. Omar
Raman Research Institute, Sadashivanagar, Bangalore 560
080, India
Abstract. The HI content of the Eridanus group of galaxies is studied using the GMRT observations and the HIPASS data. A significant Hi deficiency up to a factor of 2 2 - 3 is observed in galaxies in the Eridanus group. The deficiency is found to be directly correlated with the projected galaxy density and inversely correlated with the line-of-sight radial velocity. It is suggested that the HI deficiency is due to tidal interactions. An important implication is that significant evolution of galaxies can take place in a group environment.
Keywords: galaxies: ISM - galaxies: interactions - galaxies: kinematics and dynamics - galaxies: evolution - galaxies: clusters: individual: Eridanus group - radio lines: galaxies.