A Wavelet Analysis of the Coma Cluster

Abstract

We assemble a catalog of 798 galaxy redshifts in the region of the Coma cluster and we examine the structure of the cluster at different scales. Our structure analysis method is based on the wavelet transform and on the segmentation analysis. The wavelet transform allows us to find out structures at different scales and the segmentation method allows us a quantitative statistical and morphological analysis of the sample. Our results are expressed in terms of number of structures and sphericity for different values of the threshold detection and at all the scales investigated. According to our analysis, there is strong evidence for multiple hierarchical substructure, on the scales ranging from a few hundreds of Kpc to about 4h ^-1 Mpc, and the substructure morphology is rather spherical.