North Ecliptic Pole multi-wavelength survey : new optical data with
  Hyper Suprime-Cam and near-future prospects with eROSITA
  The AKARI North Ecliptic Pole (NEP) survey consists of two survey projects:
NEP-Deep (0.5 sq.deg) and NEP-Wide (5.4 sq.deg), providing with tens of
thousands of galaxies. A continuous filter coverage in the mid-infrared
wavelengths (7, 9, 11, 15, 18 and 24 $\mu$m) is unique to diagnose the
contributions from dusty star-formation activity and AGNs. Here we present
current status focused on the newly obtained optical images and near-future
prospects with a new X-ray telescope.
  Hyper Suprime-Cam on Subaru telescope is a gigantic optical camera with huge
Field of View (FoV). Thanks to the wide FoV, we successfully obtained deep
optical images at g, r, i, z and Y-bands covering most of the NEP-Wide field.
Using the deep optical images, we identified over 5000 optical counterparts of
the mid-IR sources, presumably deeply obscured galaxies in NEP-Wide field. We
also investigated properties of these infrared sources with SED-fitting.
  eROSITA, to be launched early 2018, is a new all-sky X-ray survey telescope,
and expected to conduct ultra deep 2-10 keV imaging toward NEP. We expect
unprecedentedly numerous Compton-thick AGN candidates when combined with the
multi-wavelength data in NEP region.
