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Dusty, star-forming galaxies have a critical role in the formation andevolution of massive galaxies in the Universe. Using deep far-infrared imagingin the range 100-500um obtained with the Herschel telescope, we investigate thedust-obscured star formation in the galaxy cluster XDCP J0044.0-2033 at z=1.58,the most massive cluster at z >1.5, with a measured mass M200= 4.7x10$^{14}$Msun. We perform an analysis of the spectral energy distributions (SEDs) of 12cluster members (5 spectroscopically confirmed) detected with >3$\sigma$significance in the PACS maps, all ULIRGs. The individual star formation rates(SFRs) lie in the range 155-824 Ms/yr, with dust temperatures of 24$\pm$35 K.We measure a strikingly high amount of star formation (SF) in the cluster core,SFR (< 250 kpc) > 1875$\pm$158 Ms/yr, 4x higher than the amount of starformation in the cluster outskirts. This scenario is unprecedented in a galaxycluster, showing for the first time a reversal of the SF-density relation atz~1.6 in a massive cluster.

The reversal of the SF-density relation in a massive, X-ray selected galaxy cluster at z=1.58: results from Herschel