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S18B0044abst

S18B0044

Galaxies isolated in underdense regions have intrinsically evolved without any interaction with neighbors and environments, while galaxies settled in galaxy clusters are vulnerable to effects peculiar to the overdense regions. The two contrary environments give us an insight on how the environments affect the characterization of galaxy properties from a different point of view. We here propose HSC NB921 imaging in 26 deg2 of the HSC-SSP Wide layer including void and supercluster regions at several tens Mpc scale at z∼0.40. Such large-scale environments are not seen in the HSC-SSP Deep/UltraDeep layers. We select HΞ± emission-line galaxies at zβ‰ˆ0.404Β±0.01 and investigate the luminosity function, stellar mass function, and stellar mass – size relation for the galaxies in the underdense/overdense regions. The down-sizing scenario suggests that more massive galaxies have evolved earlier in overdense regions. The galaxy interactions are likely to stimulate the star-formation activity and make the size larger. The underdense regions with a larger scale leave the galaxies isolated since the earlier Universe. Therefore, the comparison of star formation, mass assembly, and size of galaxies between the large-scale underdense/overdense regions highlights a role of environment in the galaxy evolution.

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