THE INNER STRUCTURE OF GALAXY CLUSTERS IN THE TRIPLETS

The inner structure of galaxy clusters is determined by the interaction of baryon matter with the surrounding structures and the influence of the underlying dark matter. For the search of the results of such interaction, we select the 18 triplets (11 elongated and 7 rounded ones) of galaxy clusters from the triplets founded in the PF Catalogue of Galaxy Clusters and Groups (Panko & Flin). The shape of the all founded triplets vary from practically regular triangle to straight chain, i.e., the ellipticity of the best-fitted ellipse of the triplets ranged from 0.12 to 0.92. We select the triplets with ellipticities in the range 0.8−1.0 as the first subset and with the ellipticities in the range 0.1−0.4 as the second one. The comparison the results obtained for two subsets allowed to conclude the elongated triplets arise along the filament. Binggeli effect was detected in a major part of clusters. In the linear substructure L11 in PF 0369–7499 galaxies show also perpendicular alignment in contrast to other galaxies of this cluster. We suppose the substructures in the galaxy clusters of our data set must be connected with the influence of other triplet members.