Unveiling the nature of the Spiderweb protocluster: a cool core cluster in the making

The archetypal Spiderweb Galaxy lies at the center of a protocluster at z=2.16. Thanks to our Chandra Large Program we are able to study i) the nuclear emission from the central galaxy and 13 protocluster members, measuring a strong enhancement of nuclear activity in this large scale structure; ii) the diffuse inverse-Compton emission from the radio jets constraining the mechanical feedback and the effects on the surrounding diffuse medium; iii) the proto-intracluster medium (ICM) combining deep X-ray with sub-millimeter observations of the Sunyaev-Zeldovich effect obtained by the Atacama Large Millimeter/submillimeter Array.  In particular, we constrain the energy budget of feedback, measure the electron density and ICM temperature profiles, revealing for the first time the presence of a strong cool core in a halo at  z > 2.  Our results have profound implications for the formation and evolution of massive galaxies and environmental effects associated to overdense regions in the early Universe.