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We aim to reveal environmental dependence of infrared luminosity functions(IR LFs) of galaxies at z~0.8 using the AKARI satellite. We construct restframe8um IR LFs in the cluster region RXJ1716.4+6708 at z=0.81, and compare themwith a blank field using the AKARI North Ecliptic Pole deep field data at thesame redshift. AKARI's wide field of view (10'x10') is suitable to investigatewide range of galaxy environments. AKARI's 15um filter is advantageous heresince it directly probes restframe 8um at z~0.8, without relying on a largeextrapolation based on a SED fit, which was the largest uncertainty in previouswork. We have found that cluster IR LFs at restframe 8um have a factor of 2.4smaller L^* and a steeper faint-end slope than that of the field. Confirmingthis trend, we also found that faint-end slopes of the cluster LFs becomesflatter and flatter with decreasing local galaxy density. These changes in LFscannot be explained by a simple infall of field galaxy population into acluster. Physics that can preferentially suppress IR luminous galaxies in highdensity regions is required to explain the observed results.

Environmental dependence of 8um luminosity functions of galaxies at z~0.8: Comparison between RXJ1716.4+6708 and the AKARI NEP deep field