Pseudo bulges in galaxy groups: the role of environment in secular
  evolution
  We examine the dependence of the fraction of galaxies containing pseudo
bulges on environment for a flux limited sample of $\sim$5000 SDSS galaxies. We
have separated bulges into classical and pseudo bulge categories based on their
position on the Kormendy diagram. Pseudo bulges are thought to be formed by
internal processes and are a result of secular evolution in galaxies. We
attempt to understand the dependence of secular evolution on environment and
morphology. Dividing our sample of disc+bulge galaxies based on group
membership into three categories: central and satellite galaxies in groups and
isolated field galaxies, we find that pseudo bulge fraction is almost equal for
satellite and field galaxies. Fraction of pseudo bulge hosts in central
galaxies is almost half of the fraction of pseudo bulges in satellite and field
galaxies. This trend is also valid when only galaxies are considered only
spirals or S0. Using the projected fifth nearest neighbour density as measure
of local environment, we look for the dependence of pseudo bulge fraction on
environmental density. Satellite and field galaxies show very weak or no
dependence of pseudo bulge fraction on environment. However, fraction of pseudo
bulges hosted by central galaxies decreases with increase in local
environmental density. We do not find any dependence of pseudo bulge luminosity
on environment. Our results suggest that the processes that differentiate the
bulge types are a function of environment while processes responsible for the
formation of pseudo bulges seem to be independent of environment.
