Abstract
We reveal the cosmic star-formation history obscured by dust using deep infrared observation with the AKARI. We found that restframe 8 μm (0.38<z<2.2), 12 μm (0.15<z<1.16), and total infrared (TIR) luminosity functions (LFs) (0.2<z<1.6) constructed from the AKARI NEP deep data, show a continuous and strong evolution toward higher redshift. A continuous filter coverage in the mid-IR wavelength (2.4, 3.2, 4.1, 7, 9, 11, 15, 18, and 24 μm) by the AKARI satellite allows us to estimate restframe 8 μm and 12 μm luminosities without using a large extrapolation based on a SED fit, which was the largest uncertainty in previous work. In terms of cosmic infrared luminosity density (Ω <sub>IR</sub> ), which was obtained by integrating analytic fits to the LFs, we found a good agreement with previous work at z<1.2, with Ω <sub>IR</sub> ∝(1+z) <sup>4.4±1.0</sup> . When we separate contributions to Ω <sub>IR</sub> by LIRGs and ULIRGs, we found that IR luminous sources are increasingly more important at higher redshift. We found that the ULIRG (LIRG) contribution increases by a factor of 10 (1.8) from z = 0.35 to z = 1.4. © 2010 American Institute of Physics.