The Substructure in the Cluster Abell85

We revisit the HI distribution of individual galaxies in the nearby cluster A1367 (z=0.02). First we study in detail the gas-rich galaxies projected NW of the cluster center, which constitute a group of giant active star-forming galaxies, dominated by the massive UGC 6697, infalling to the cluster core. In addition we explore, with the help of more recent VLA-HI data, the compact group of low-mass star forming galaxies dominated by the Zwicky objects CGCG 097-125/114. For the two samples of galaxies we compare the atomic hydrogen distribution with Hα imaging, in order to inspect for the environmental effects produced on both groups during their infall toward the center of A1367. We try to distinguish between gravitational and hydrodynamical effects (interaction with the ICM) to explain the observed star formation activity.

In the second part of this work, the cluster of galaxies A85 has been deeply surveyed in HI with the VLA. We have previously reported a striking asymmetry in the distribution of HI-rich galaxies around the cluster: all of them appear projected east from the cluster center, and show an average velocity more than 1000 km/s below the cluster systemic value. In this work we make a step forward carrying a detailed study on individual HI properties of the detected galaxies. Using extensive spectro photometric catalogues we trace the distribution of late-type HI-poor galaxies. We estimate the HI deficiency for both, the HI detected and (lower limits) non-detected galaxies. All this provides with new information on the substructure of the very complex A85/A87/A89 system.