Photometric Observations of Southern Abell Cluster Redshifts Survey Clusters: Structure of Galaxies in the Inner Region of Clusters of Galaxies

We analyze photometric properties of 1384 cluster galaxies as a function of normalized distance to the cluster center. These galaxies were selected in the central region (r/r200 ≤ 0.8) of 14 southern Abell clusters chosen from the Southern Abell Redshift Survey. For 507 of these galaxies we also obtained luminosity profiles. We have studied the morphology-clustercentric distance relation on the basis of the shape parameter n of the Sérsic law. We have also analyzed the presence of a possible segregation in magnitude for both the galaxy total luminosity and the luminosity of its components (i.e., the bulge and the disk). Results show a marginal (2 σ level) decrease of the total luminosity as a function of normalized radius. However, when bulges are analyzed separately, a significant luminosity segregation is found (3 σ and 2 σ for galaxies in projection and member galaxies, respectively). The fraction of bulges brighter than MB ≤ -22 is 3 times larger in the core of clusters than in the outer region. Our analysis of the disk component suggests that disks are, on average, less luminous in the cluster core than at r/r200 ∼ 0.8. In addition, we find that the magnitude-size relation as a function of r/r200 indicates (at the 2 σ level) that disks are smaller and centrally brighter in the cores of clusters. However, the Kormendy relation (the bulge magnitude-size relation) appears to be independent of environment.