Abstract:
The HI content of galaxies in the Eridanus group is studied using the GMRT observations and the HIPASS data. A significant HI deficiency up to a factor of 2–3 is observed in galaxies in the high galaxy density regions. The HI deficiency in galaxies is observed to be directly correlated to the local projected galaxy density, and inversely correlated to the lineof- sight radial velocity. Furthermore, galaxies with larger optical diameters
are predominantly in the lower galaxy density regions. It is suggested that the HI deficiency in Eridanus is due to tidal interactions. In some galaxies,
evidences of tidal interactions are seen. An important implication is that
significant evolution of galaxies can take place in the group environment.
In the hierarchical way of formation of clusters via mergers of groups, a
fraction of the observed HI deficiency in clusters could have originated in
groups. The co-existence of S0s and severely HI deficient galaxies in the
Eridanus group suggests that tidal interaction is likely to be an effective
mechanism for transforming spirals to S0s.