Abstract

Contributed Talk - Splinter GalaxyClusters   (MW-1050)

The connectivity-mass relation of eROSITA clusters

Nicola Malavasi, Esra Bulbul, Klaus Dolag, and the eROSITA Cluster Cosmology Team
Max Planck Institute for Extraterrestrial Physics

The cosmic web is a network of structures composed of dark matter, galaxies, and gas. In this network, galaxy clusters occupy the position of nodes, connected among them by filaments. Connectivity is a measurement of the number of filaments connected to a node of the cosmic web, i.e. to a cluster. Theoretical works predict a relationship between the connectivity of a node and its mass, with more connected structures also being more massive. Connectivity, thus, has a strong importance to study the accretion of matter on clusters, structure growth, and cosmology. I will describe our measurement of the connectivity-mass relation obtained with clusters detected in X-ray by eROSITA and the filament samples detected with DisPerSE in spectroscopic surveys (GAMA) and with photometric redshifts (DESI Legacy Imaging Surveys). I will provide a thorough characterization of the relation and its evolution with redshift, as well as an accurate comparison with existing works in the literature on the same topic.