S22B0065
S22B0065
Galaxy formation is a complex process, which involves an internal process and external effects such as merger and harassment. Cosmic voids with low-density environment provide us a unique laboratory for disentangling these processes. With a unique combination of an NB filter, and 8.2Β m aperture and a wide FoV, the Subaru telescope with HSC will verify the presence of possibly the largest underdensity region (supervoid) with a comoving radius of Β 200 Mpc/h toward the cosmic microwave background Cold Spot. Our observation will give us an unprecedented opportunity to study the clustering property of line emitting galaxies in the largest low-density environment in the universe. Since the cosmic expansion rate is large in such an extremely large underdense region, the growth of structures and the galaxy evolution are expected to be slow. In other words, we expect an increase in the effective look-back time, which implies enhanced clustering of star forming galaxies though the local cosmic density is decreased. Our observations will provide indispensable data to carry out follow-up observations with the PFS in the next decade.
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