Title:
	Far-Infrared Cosmological Survey in AKARI Deep Field South

Author(s):
	Mai Shirahata, Shuji Matsuura (ISAS/JAXA, Japan),
	Mitsunobu Kawada, Tsutom T. Takeuchi (Nagoya Univ., Japan),
	Toshinobu Takagi, Shinki Oyabu, Takao Nakagawa (ISAS/JAXA, Japan),
	Agnieszka Pollo (IPJ, Poland), Chris P. Pearson (RAL, UK),
	Stephen Serjeant, Glenn White (Open Univ., UK)

Abstract:

Far-infrared galaxy surveys provide us with a powerful tool
to investigate the star-formation history in the Universe,
because they measure thermal emission from dust heated
by the UV light from massive stars.
They also play an important role in tracing large-scale structure,
measuring the cosmic infrared background and
analysis of the clustering of luminous infrared galaxies.

For these purposes, we have carried out a deep survey at
65, 90, 140, and 160 microns with the FIS instrument
onboard the AKARI satellite.
In order to minimize the contamination from the Galactic cirrus emission,
we selected the lowest cirrus density region near the South Ecliptic Pole
as a survey field (AKARI Deep Survey South: ADF-S).
The area of the survey is ~12 deg2.
This survey is unique in having continuous wavelength coverage
across four photometric bands including wavelengths
not well explored by previous missions,
and contiguous mapping in an unprecedentedly wide area.

We have successfully detected almost 2000 galaxies down to ~10 mJy at 90 um,
and measured infrared colors for about 500 of them.
In this talk, we present the details of the ADFS survey,
and show the galaxy counts obtained from it.
The galaxy counts provide useful constraints for
the evolution scenario of galaxies.
The source counts obtained from the ADFS catalog suggest that
currently accepted models of the galaxy evolution should be modified.
We also present the current status of multi-band follow-up observations,
and discuss the properties of these galaxies such as
optical IDs, infrared colors, and SEDs.
Follow-up observations with ground-based large telescopes
plays an important role to investigate the characteristics of these galaxies.