084421

We propose to observe the most massive comma M500 = 6x10e14 Msun comma infrared selected galaxy cluster MOO J1142+1527 discovered in the MaDCoWS survey at z=1.2.Deep XMM observations will allow us to determine the gas morphology at large scale and extract the radial density comma temperature comma pressure and hydrostatic mass profiles up to R500.X-rays will be complemented by NIKA2 comma an instrument which will perform Sunyaev-Zel Dovich observations with the same spatial resolution as XMM.This will allow us to explore the robustness of mass determination and estimate the non-thermal pressure support for the first time at z>1.Supported also by rich ancillary optical comma infrared comma and Chandra observations comma we will be able to obtain a complete picture of the spatially resolved halo properties of this extreme cluster.