X-RAY AND OPTICAL-PROPERTIES OF CLUSTERS OF GALAXIES

We study X-ray and optical properties of a sample of ACO clusters of g alaxies with dumbbells as tile brightest cluster galaxy. In this work we use X-ray data from the ROSAT archive and galaxy distributions take n from the COSMOS data base. We compute moments for the X-ray emission s and for tile galaxy distributions. Based on tile morphological prope rties of clusters of galaxies we investigate possible relations betwee n the evolution of clusters of galaxies, dumbbell systems and cD galax ies. The existence of central cooling flows is examined to test whethe r this phenomenon is affected by the presence of dumbbell galaxies.