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tokens: We thank the anonymous referee for the careful and constructive reading of the paper and for his/her useful suggestions. We would like to thank Marta Volonteri and Lorenzo Lovisari for helpful feedback during the draft of the paper and Volker Springel for making the GADGET-3 code available to us. This project has received funding from: ExaNeSt and Euro Exa projects, funded by the European Union’s Horizon 2020 research and innovation program under grant agreement No 671553 and No 754337, the agreement ASI-INAF n.2017-14-H.0, the Agencia Nacional de Promoción Científica y Tecnológica de la República Argentina under the PICT2417-2013 grant; the Consejo Nacional de Investigaciones Científicas y Técnicas de la República Argentina (CONICET); the Secretaría de Ciencia y Técnica de la Universidad Nacional de Córdoba – Argentina (SeCyT); the European Union’s Horizon 2020 Research and Innovation Programme under the Marie Sklodowska-Curie grant agreement No 734374, PRIN-MIUR 2015W7KAWC, the INFN INDARK grant, NASA Chandra GO7-18121X and GO8-19104X. Simulations have been carried out using MENDIETA Cluster from CCAD-UNC, which is part of SNCAD-MinCyT (Argentina) and MARCONI at CINECA (Italy), with CPU time assigned through grants ISCRA C, and through INAF-CINECA and University of Trieste – CINECA agreements. The post-processing has been performed using the PICO HPC cluster at CINECA through our expression of interest.