WP-2  High-z clusters

HST and IRAC observations have been very effective to obtain robust photometric redshifts for clusters at high redshift as well as statistical cluster membership on a galaxy to galaxy base and broad spectral type classification of star-forming and passive galaxies (Strazzullo et al. 2019 and 2023). And yet, optical-NIR observations are not able to detect heavily dust obscured star formation. For this reason we obtained deep MeerKAT observations in the field of the five clusters to test previous results (Pannella et al. in preparation)

Thanks to wide field imaging from ESO VLT we have imaged the whole cluster sample beyond the virial radius and into the infall region (Strazzullo et al. in preparation) to investigate the clustercentric evolution of quenching efficiency and the amount of preprocessing suffered by galaxies before entering the structure.

The unrivalled angular resolution of ALMA and ACA is allowing a first detailed characterization of the electron pressure distribution in these clusters first out to the virial radius and down to spatial scales unexplored at these redshifts. This is complementing the constraints from galaxy population studies on the radial dependence of environmental quenching, or on any link with the clusters dynamical state or with small-scale structures (shocks, sloshing, etc.) associated with the merging and formation history of the systems (Di Mascolo et al. in preparation).