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We present the environmental dependence of colour, stellar mass, and starformation (SF) activity in H-alpha-selected galaxies along the large-scalestructure at z=0.4 hosting twin clusters in DEEP2-3 field, discovered by SubaruStrategic Programme of Hyper Suprime-Cam (HSC SSP). By combining photo-zselected galaxies and H-alpha emitters selected with broad-band and narrow-band(NB) data of the recent data release of HSC SSP (DR1), we confirm that galaxiesin higher-density environments or galaxies in the cluster central regions showredder colours. We find that there still remains a possible colour-density andcolour-radius correlation even if we restrict the sample to H-alpha-selectedgalaxies, likely due to the presence of massive H-alpha emitters in denserregions. We also find a hint of increased star formation rates (SFR) amongstH-alpha emitters towards the highest-density environment, again primarilydriven by the excess of red/massive H-alpha emitters in high-densityenvironment, while their specific SFR does not significantly change withenvironment. This work demonstrates the power of the HSC SSP NB data to studySF galaxies across environment in the distant universe.

The nature of H$\alpha$-selected galaxies along the large-scale structure at z=0.4 revealed by Subaru Hyper Suprime-Cam survey