Аннотация
We present the environmental dependence of colour, stellar mass, and star
formation (SF) activity in H-alpha-selected galaxies along the huge cosmic web
at z=0.4 hosting twin clusters in DEEP2-3 field, discovered by Subaru Strategic
Programme of Hyper Suprime-Cam (HSC SSP). By combining photo-z selected
galaxies and H-alpha emitters selected with broad-band and narrow-band data of
the recent internal data release of HSC SSP (DR1), we confirm that galaxies in
higher-density environments or galaxies in the cluster central regions show
redder colours. We find that there still remains a colour-density and
colour-radius correlation even if we restrict the sample to H-alpha-selected
galaxies. We also find an increase of star formation rates (SFR), and possible
decline in specific SFRs, amongst H-alpha emitters towards the highest-density
environment, primarily driven by the excess of red/massive H-alpha emitters in
high-density environment. Finally, we find a hint that pairs of H-alpha
emitters located in higher-density environment show redder colours than those
in underdense regions, implying that galaxy-galaxy interaction in different
environments have different impacts on the properties of SF galaxies.
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