Yusei KoyamaPOLLETTA, Maria Del CarmenMaria Del CarmenPOLLETTAIchi TanakaTadayuki KodamaHervé DoleGeneviève SoucailBrenda FryeMatt LehnertSCODEGGIO, MARCOMARCOSCODEGGIO2022-06-072022-06-0720211745-3925http://hdl.handle.net/20.500.12386/32191We discovered an over-density of H-alpha-emitting galaxies associated with a Planck compact source in the COSMOS field (PHzG237.0+42.5) through narrow-band imaging observations with Subaru/MOIRCS. This Planck-selected dusty proto-cluster at z=2.16 has 38 H-alpha emitters including six spectroscopically confirmed 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 with log(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 the H-alpha emitters in this proto-cluster lie along the star-forming main sequence using H-alpha-based SFR estimates, whilst the cluster total SFR derived by integrating the H-alpha-based SFRs is an order of magnitude smaller than those estimated from Planck/Herschel FIR photometry. Our results suggest that H-alpha is a good observable for detecting moderately star-forming galaxies and tracing the large-scale environment in and around high-z dusty proto-clusters, but there is a possibility that a large fraction of star formation could be obscured by dust and undetected in H-alpha observations.STAMPAenArticle10.1093/mnrasl/slab0132-s2.0-85105178104https://academic.oup.com/mnrasl/article/503/1/L1/6154716?login=truehttps://ui.adsabs.harvard.edu/abs/2021MNRAS.503L...1K/abstracthttp://arxiv.org/abs/2008.13614v22021MNRAS.503L...1KFIS/05 - ASTRONOMIA E ASTROFISICA