Cluster Galaxy Morphologies: The Relationship among Structural Parameters, Activity and the Environment

We propose a new approach to estimate galaxy morphologies using a two-dimensional approach based on an elasticity (e) vs. Bulge-to-Total ratio (B/T) plane. We have calibrated this plane by comparing with Dressler's classifications [5]. With the aid of our calibration, we have classified 635 galaxies in 18 Abell clusters (0.02 < z < 0.08). Our approach allowed us to recover the Kormaed relation [7]. We found that elliptical and Spirals are slightly brighter than SO in R band. As SO bulges are brighter than spirals bulges, we believe that ram pressure is not the main mechanism to generate SOs. In our sample, cluster radio galaxy morphologies cover the range SO-E-cD and then-bulges have absolutes magnitudes distributed within -21 mag < MR < -24.5mag. If we believe Ferrates & Merrit's relation [6], these radio sources have 10(8) - 10(9)M(middle dot in circle) black holes.