We propose HSC observations to search for overdensities (ODs) in Lyα emitters (LAEs) at the late tail of the reionization epoch. This is a resubmission of our ongoing program, as only one out of six fields were observed in earlier semesters, partly because of the unavailability of Subaru telescope. The current project aims to understand the dominant physical processes driving the late stages of cosmic reionization. We are hoping to assess the relative importance of UV background fluctuations, intergalactic medium (IGM) temperature fluctuations, and the super-late reionization process. Although the relationship between LAE number densities and Lyα transmission can be used to test these scenarios, limited samples toward LAE ODs make it challenging to draw a firm conclusion. This program will distinguish between these scenarios by searching LAE ODs in fields with known metal absorption systems along background quasar sightline. This observational program will also provide an unprecedented research opportunity in synergy with HSC/NB872 and JWST/NIRCam to hunt for dual emitters of Lyα and Hα at the same redshift. Our program, together with JWST data, will allow us to unveil the spatial correlation between galaxies and the IGM and give insight into the reionization process.
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