Clustering of near clusters versus cluster compactness

The clustering properties of near Zwicky clusters are studied by using the two-point angular correlation function. The angular correlation functions for compact and medium compact clusters, than for open clusters, and for all near Zwicky clusters are estimated. The results show much stronger clustering for compact and medium compact clusters, for open clusters, and that open clusters have nearly the same clustering strength as galaxies. A detailed study of the compactness-dependence of correlation function strength is worth investigating.