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Undisturbed galaxy clusters are characterized by a massive and largeelliptical galaxy at their center, i.e. the Brightest Cluster Galaxy (BCG). Howthese central galaxies form is still debated. According to most models, atypical epoch for their assembly is z~1-2. We have performed a detailedmulti-wavelength analysis of the core of XDCPJ0044.0-2033 (XDCP0044), one ofthe most massive and densest galaxy clusters currently known at redshift z~1.6,whose central galaxy population shows high star formation compared to lower-zclusters and an X-ray AGN located close to its center. SINFONI J-, H- and KMOSYJ-, H- bands spectroscopic data have been analyzed, together with deeparchival HST photometric data in F105W, F140W, and F160W bands, Chandra X-ray,radio JVLA data at 1-2 GHz, and ALMA band-6 observations. In the central regionof the cluster (~70x70 kpc^2), 2 systems of interacting galaxies have beenidentified and studied (Complex A and B), with a total of 7 confirmed clustermembers. These galaxies show perturbed morphologies and 3 of them show signs ofAGN activity. In particular, 2 type-1 AGN with typical broad lines have beenfound at the center of each complex (both of them X-ray obscured and highlyaccreting; Eddington ratio ~0.5), while a type-2 AGN has been discovered inComplex A. The AGN at the center of Complex B is also detected in X-ray whilethe other 2 are spatially related to radio emission. The 3 AGN provide one ofthe closest AGN triple at z>1 revealed so far with a minimum(maximum) projecteddistance of ~10(40) kpc. The observation of high star formation, mergersignatures and nuclear activity in the core of XDCP0044 suggests that all theseprocesses are key ingredients in shaping the nascent BCG. According to ourdata, XDCP0044 could form a typical massive galaxy of 10^12 Msun, hosting aBlack Hole of 2x10^8-10^9 Msun, in a time scale of the order of ~2.5 Gyrs.

Multiple AGN activity during the BCG assembly of XDCPJ0044.0-2033 at z~1.6