TheHI content of the Eridanus group of galaxies |
| |
| Authors: | A Omar K S Dwarakanath |
| |
| Institution: | (1) Raman Research Institute, Sadashivanagar, 560 080 Bangalore, India;(2) Present address: ARIES, Manora peak, Nainital, 263 129, Uttaranchal, India |
| |
| 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 line-of-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. |
| |
| Keywords: | Galaxy: evolution galaxies: groups clusters individual: Eridanus HI 21cm-line" target="_blank">radio lines:HI 21cm-line |
| 本文献已被 SpringerLink 等数据库收录！ |
|
