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We present a Herschel/SPIRE survey of three protoclusters at z=2-3(2QZCluster, HS1700, SSA22). Based on the SPIRE colours (S350/S250 andS500/S350) of 250 $\mu$m sources, we selected high redshift dusty star-forminggalaxies potentially associated with the protoclusters. In the 2QZClusterfield, we found a 4-sigma overdensity of six SPIRE sources around 4.5' (~2.2Mpc) from a density peak of H$\alpha$ emitters at z=2.2. In the HS1700 field,we found a 5-sigma overdensity of eight SPIRE sources around 2.1' (~1.0 Mpc)from a density peak of LBGs at z=2.3. We did not find any significantoverdensities in SSA22 field, but we found three 500 $\mu$m sources areconcentrated 3' (~1.4 Mpc) east to the LAEs overdensity. If all the SPIREsources in these three overdensities are associated with protoclusters, theinferred star-formation rate densities are 10$^3$-10$^4$ times higher than theaverage value at the same redshifts. This suggests that dusty star-formationactivity could be very strongly enhanced in z~2-3 protoclusters. Furtherobservations are needed to confirm the redshifts of the SPIRE sources and toinvestigate what processes enhance the dusty star-formation activity in z~2-3protoclusters.

Herschel protocluster survey: A search for dusty star-forming galaxies in protoclusters at z=2-3