Discovery of a massive X-ray luminous galaxy cluster at z=1.579

14We report on the discovery of a very distant galaxy cluster serendipitously detected in the archive of the XMM-Newton mission, within the scope of the XMM-Newton Distant Cluster Project (XDCP). XMMUJ0044.0-2033 was detected at a high significance level (5 sigma) as a compact, but significantly extended source in the X-ray data, with a soft-band flux f(r 1.6.nonenoneSantos JS; Fassbender R; Nastasi A; Bohringer H; Rosati P; Suhada R; Pierini D; Nonino M; Muhlegger M; Quintana H; Schwope AD; Lamer G; de Hoon A; Strazzullo VSantos, Js; Fassbender, R; Nastasi, A; Bohringer, H; Rosati, P; Suhada, R; Pierini, D; Nonino, M; Muhlegger, M; Quintana, H; Schwope, Ad; Lamer, G; de Hoon, A; Strazzullo,