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The aim of this work is to characterize physical properties of Ultra LuminousInfrared Galaxies (ULIRGs) and Luminous Infrared Galaxies (LIRGs) detected inthe far-infrared (FIR) 90um band in the AKARI Deep Field-South (ADF-S) survey.In particular, we want to estimate the AGN contribution to the [U]LIRGs'infrared emission and which types of AGNs are related to their activity. Weexamined 69 galaxies at z>0.05 detected at 90um by the AKARI satellite in theADF-S, with optical counterparts and spectral coverage from the ultraviolet tothe FIR. We used two independent spectral energy distribution fitting codes:one fitting the SED from FIR to FUV (CIGALE) and gray-body + power spectrum fitfor the infrared part of the spectra (CMCIRSED) in order to identify asubsample of [U]LIRGs, and to estimate their properties. Based on the CIGALESED fitting, we have found that [U]LIRGs selected at the 90um AKARI bandcompose ~56% of our sample (we found 17 ULIRGs and 22 LIRGs, spanning over theredshift range 0.06<z<1.23). Their physical parameters, such as stellar mass,star formation rate (SFR), and specific SFR are consistent with the ones foundfor other samples selected at IR wavelengths. We have detected a significantAGN contribution to the MIR luminosity for 63% of LIRGs and ULIRGs. Our LIRGscontain Type 1, Type 2, and intermediate types of AGN, whereas for ULIRGs, amajority (more than 50%) of AGN emission originates from Type 2 AGNs. Thetemperature--luminosity and temperature--mass relations for the dust componentof ADF--S LIRGs and ULIRGs indicate that these relations are shaped by the dustmass and not by the increased dust heating. We conclude that LIRGs contain Type1, Type 2, and intermediate types of AGNs, with an AGN contribution to the MIRemission at the median level of 13+/-3%, whereas the majority of ULIRGs containType 2 AGNs, with a median AGN fraction equal to 19+/-8%.

[Ultra] Luminous Infrared Galaxies selected at 90 $\mu$m in the AKARI deep field: a study of AGN types contributing to their infrared emission