Speaker
Description
The cosmic web is a network of structures composed of dark matter, galaxies, and gas. In this network, galaxy clusters and groups 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, be it a cluster or a group. 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 the eRASS:1 cluster sample extracted from the eROSITA data and the filament samples detected with DisPerSE in spectroscopic surveys (GAMA) and with photometric redshifts (DESI Legacy Surveys). We characterize the relation, in an attempt to identify a change of slope to identify the transition regime from clusters to groups and to provide a fit to the relation to be used for further studies and comparison with numerical simulations.
