S20A0026abst
S20A0026
We propose to complete our spectroscopic campaign for a galaxy overdensity at z=7, z7OD, which is a candidate of the most distant protocluster reported to date. z7OD is composed of nine Lyman alpha emitters (LAEs) with a number density 7 times higher than the normal field, which is identified in our unique 3.1 deg2 very large and deep Subaru/Hyper Surprime-Cam (HSC) NB973 observations. Four out of the nine LAEs in z7OD are already spectroscopically confirmed with LyΞ± in our previous observations and the literature. In this program, we will target remaining five LAEs in z7OD, to spectroscopically confirm this most distant protocluster candidate. The proposed spectroscopy is also essential for detailed comparisons with cosmological simulations. Since the ALMA band6 and Subaru/HSC IB945 observations fine-tuned for z7OD are already conducted, this program is important to maximize scientific outputs from these observations, and is an important step to understand the process of the cosmic reionization and galaxy cluster formation at very high redshift.
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