Luminosity Functions of Local Infrared Galaxies with AKARI: Implications
  to the Cosmic Star Formation History and AGN Evolution
  Infrared (IR) luminosity is fundamental to understanding the cosmic star
formation history and AGN evolution. The AKARI IR space telescope performed all
sky survey in 6 IR bands (9, 18, 65, 90, 140, and 160um) with 3-10 times better
sensitivity than IRAS, covering the crucial far-IR wavelengths across the peak
of the dust emission. Combined with a better spatial resolution, AKARI can much
more precisely measure the total infrared luminosity (L_TIR) of individual
galaxies, and thus, the total infrared luminosity density in the local
Universe. By fitting IR SED models, we have re-measured L_TIR of the IRAS
Revised Bright Galaxy Sample. We present mid-IR monochromatic luminosity to
L_TIR conversions for Spitzer 8,24um, AKARI 9,18um, IRAS 12um, WISE 12,22um,
and ISO 15um filters, with scatter ranging 13-44%. The resulting AKARI IR
luminosity function (LF) agrees well with that from the IRAS. We integrate the
LF weighted by L_TIR to obtain a cosmic IR luminosity density of Omega_TIR=
(8.5^{+1.5}_{-2.3})x 10^7 L Mpc^-3, of which 7+-1% is produced by LIRGs, and
only 0.4+-0.1% is from ULIRGs in the local Universe. Once IR contributions from
AGN and star-forming galaxies (SFG) are separated, SFG IR LF shows a steep
decline at the bright-end. Compared with high-redshift results from the AKARI
NEP deep survey, these data show a strong evolution of Omega_TIRSF propto
(1+z)^4.0+-0.5, and Omega_TIRAGN propto (1+z)^4.4+-0.4. For Omega_TIRAGN, the
ULIRG contribution exceeds that from LIRG already by z~1. A rapid evolution in
both Omega_TIRAGN and Omega_TIRSFG suggests the correlation between star
formation and black hole accretion rate continues up to higher redshifts. We
compare the evolution of Omega_TIRAGN to that of X-ray luminosity density. The
Omega_TIRAGN/Omega_X-rayAGN ratio shows a possible increase at z>1, suggesting
an increase of obscured AGN at z>1.
