Studying properties of high redshift galaxies is important to understand
galaxy formation and cosmic reionization.
Currently we are studying high redshift galaxies using large data taken in
the Subaru/Hyper Suprime-Cam (HSC)
survey, which is a wide and deep survey covering $\sim 1000$ deg$^2$ with deep
optical imaging. Using the Subaru/HSC
data, we have so far identified $\sim 500,000$ Lyman break galaxies (LBGs) and
$\sim$ 2000 Lyman alpha emitters (LAEs)
at z>4, which are the largest sample of high redshift galaxies to date.In
this talk, we will show our recent results
about high redshift galaxies, including the physical origin of the cosmic
star formation history, ISM properties
revealed with ALMA, and an identification of the highest-redshift
protocluster.
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