Dusty starbursts and the formation of elliptical galaxies: A SCUBA-2
  survey of a z=1.46 cluster
  We report the results of a deep SCUBA-2 850- and 450-$\mu$m survey for
dust-obscured ultra-luminous infrared galaxies (U/LIRGs) in the field of the
z=1.46 cluster XCS J2215.9-1738. We detect a striking overdensity of
sub-millimeter sources coincident with the core of this cluster: $\sim 3-4
\times$ higher than expected in a blank field. We use the likely radio and
mid-infrared counterparts to show that the bulk of these sub-millimeter sources
have spectroscopic or photometric redshifts which place them in the cluster and
that their multi-wavelength properties are consistent with this association.
The average far-infrared luminosities of these galaxies are $(1.0\pm0.1) \times
10^{12} L_{\odot}$, placing them on the U/LIRG boundary. Using the total star
formation occurring in the obscured U/LIRG population within the cluster we
show that the resulting mass-normalized star-formation rate for this system
supports previous claims of a rapid increase in star-formation activity in
cluster cores out to $z\sim1.5$, which must be associated with the on-going
formation of the early-type galaxies which reside in massive clusters today.
