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We have surveyed the core regions of the z = 1.46 cluster XCS J2215.9-1738with the Atacama Large Millimeter Array (ALMA) and the MUSE-GALACSIspectrograph on the VLT. We obtained high spatial resolution observations withALMA of the 1.2 mm dust continuum and molecular gas emission in the centralregions of the cluster. These observations detect 14 significant millimetresources in a region with a projected diameter of just ~500kpc (~1'). For six ofthese galaxies we also obtain 12 CO(2-1) and 12 CO(5-4) line detections,confirming them as cluster members, and a further five of our millimetregalaxies have archival 12CO(2-1) detections which also place them in thecluster. An additional two millimetre galaxies have photometric redshiftsconsistent with cluster membership, although neither show strong line emissionin the MUSE spectra. This suggests that the bulk (> 11/14, ~80%) of thesubmillimetre sources in the field are in fact luminous infrared galaxies lyingwithin this young cluster. We then use our sensitive new observations toconstrain the dust-obscured star formation activity and cold molecular gaswithin this cluster. We find hints that the cooler dust and gas componentswithin these galaxies may have been influenced by their environment reducingthe gas reservoir available for their subsequent star formation. We also findthat these actively star- forming galaxies have the dynamical masses andstellar population ages expected for the progenitors of massive, early-typegalaxies in local clusters potentially linking these populations.

ALMA pin-points a strong over-density of U/LIRGs in the massive cluster XCS J2215 at z=1.46