Multi-wavelength view of a massive galaxy cluster merger at z=1.13

I present recent results from a multi-wavelength analysis of the SPT-CL J2106-5844. Among the most massive galaxy clusters ever observed at a redshift z>1, multiple studies have shown that the system is undergoing a major merger. Observations of the Sunyaev-Zeldovich (SZ) effect by the Atacama Large Millimeter Array allowed us to identify two distinct components to the intracluster medium, more or less cospatial with mass sub-structures found in the independent weak-lensing reconstruction of the cluster mass. On the other hand, pilot data from the Evolutionary Map of the Universe survey, in combination with observations by the Australia Telescope Compact Array, highlighted the presence of an extended radio structure, potentially associated with runaway cooling of gas and enhanced star formation activity within the cluster core. Although many questions are still unresolved, this study demonstrated that the inclusion of SZ information into a nearly panchromatic picture of galaxy clusters can provide paramount insights into the dynamical and astrophysical processes operating in the intracluster medium at epochs central for the assembly of galaxy clusters