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We discovered an over-density of H-alpha-emitting galaxies associated with aPlanck compact source in the COSMOS field (PHzG237.0+42.5) through narrow-bandimaging observations with Subaru/MOIRCS. This Planck-selected dustyproto-cluster at z=2.16 has 38 H-alpha emitters including six spectroscopicallyconfirmed galaxies in the observed MOIRCS 4'x7' field (corresponding to~2.0x3.5~Mpc^2 in physical scale). We find that massive H-alpha emitters withlog(M*/Msun)>10.5 are strongly clustered in the core of the proto-cluster(within ~300-kpc from the density peak of the H-alpha emitters). Most of theH-alpha emitters in this proto-cluster lie along the star-forming main sequenceusing H-alpha-based SFR estimates, whilst the cluster total SFR derived byintegrating the H-alpha-based SFRs is an order of magnitude smaller than thoseestimated from Planck/Herschel FIR photometry. Our results suggest that H-alphais a good observable for detecting moderately star-forming galaxies and tracingthe large-scale environment in and around high-z dusty proto-clusters, butthere is a possibility that a large fraction of star formation could beobscured by dust and undetected in H-alpha observations.

A Planck-selected dusty proto-cluster at z=2.16 associated with a strong over-density of massive H$\alpha$ emitting galaxies