A 16 deg$^2$ survey of emission-line galaxies at z<1.6 from HSC-SSP PDR2
  and CHORUS
  We have conducted a comprehensive survey of emission-line galaxies at
$z\lesssim1.6$ based on narrowband (NB) imaging data taken with Hyper
Suprime-Cam (HSC) on the Subaru telescope. In this paper, we update the
catalogs of H$\alpha$, [OIII], and [OII] emission-line galaxies using the data
from the second Public Data Release (PDR2) of Subaru Strategic Program (SSP) of
HSC and Cosmic HydrOgen Reionization Unveiled with Subaru (CHORUS) survey along
with the spectroscopic redshifts for 2,019 emission-line galaxies selected with
the PDR1 data. The wider effective coverage of NB816 and NB921, 16.3 deg$^2$
and 16.9 deg$^2$ respectively, are available in the Deep and UltraDeep layers
of HSC-SSP from the PDR2. The CHORUS survey provides us with data with
additional three NBs (NB527, NB718, and NB973) in the COSMOS field in the
UltraDeep layer (1.37 deg$^2$). The five NB datasets allow us to investigate
the star-forming galaxies presenting emission-lines at 14 specific redshifts
ranging from $z\sim1.6$ down to $z\sim0.05$. We revisit the distribution of
large-scale structures and luminosity functions (LFs) for the emission-line
galaxies with the large samples of 75,377 emission-line galaxies selected. The
redshift revolution of LFs shows that the star formation rate densities (SFRDs)
decreases monotonically from $z\sim1.6$, which is consistent with the cosmic
SFRD ever known. Our samples of emission-line galaxies covering a sufficiently
large survey volume are useful to investigate the evolution of star-forming
galaxies since the cosmic noon in a wide range of environments including galaxy
clusters, filaments, and voids.
