Infrared luminosity functions based on 18 mid-infrared bands: revealing
  cosmic star formation history with AKARI and Hyper Suprime-Cam
  Much of the star formation is obscured by dust. For the complete
understanding of the cosmic star formation history (CSFH), infrared (IR) census
is indispensable. AKARI carried out deep mid-infrared observations using its
continuous 9-band filters in the North Ecliptic Pole (NEP) field (5.4 deg$^2$).
This took significant amount of satellite's lifetime, $\sim$10\% of the entire
pointed observations.
  By combining archival Spitzer (5 bands) and WISE (4 bands) mid-IR photometry,
we have, in total, 18 band mid-IR photometry, which is the most comprehensive
photometric coverage in mid-IR for thousands of galaxies. However previously,
we only had shallow optical imaging ($\sim$25.9ABmag) in a small area of 1.0
deg$^2$. As a result, there remained thousands of AKARI's infrared sources
undetected in optical.
  Using the new Hyper Suprime-Cam on Subaru telescope, we obtained deep enough
optical images of the entire AKARI NEP field in 5 broad bands ($g\sim$27.5mag).
These provided photometric redshift, and thereby IR luminosity for the
previously undetected faint AKARI IR sources. Combined with the accurate mid-IR
luminosity measurement, we constructed mid-IR LFs, and thereby performed a
census of dust-obscured CSFH in the entire AKARI NEP field.
  We have measured restframe 8$\mu$m, 12$\mu$m luminosity functions (LFs), and
estimated total infrared LFs at 0.35$<$z$<$2.2. Our results are consistent with
our previous work, but with much reduced statistical errors thanks to the large
area coverage of the new data. We have possibly witnessed the turnover of CSFH
at $z\sim$2.
