We present mid-infrared ( MIR ) luminosity functions ( LFs ) of local ( z < 0.3 ) star-forming ( SF ) galaxies in the AKARI ’ s NEP-Wide Survey field .
In order to derive more accurate luminosity function , we used spectroscopic sample only .
Based on the NEP-Wide point source catalogue containing a large number of infrared ( IR ) sources distributed over the wide ( 5.4 deg ^ { 2 } ) field , we incorporated the spectroscopic redshift ( z ) data for \sim 1790 selected targets obtained by optical follow-up surveys with MMT/Hectospec and WIYN/Hydra .
The AKARI ’ s continuous 2 – 24 \mu m wavelength coverage as well as photometric data from optical u ^ { * } band to near-infrared H - band with the spectroscopic redshifts for our sample galaxies enable us to derive accurate spectral energy distributions ( SEDs ) in the mid-infrared .
We carried out SED-fit analysis and employed 1 / V _ { max } method to derive the MIR ( e.g. , 8 \mu m , 12 \mu m , and 15 \mu m rest-frame ) luminosity functions .
We fit our 8 \mu m LFs to the double power-law with the power index of \alpha = 1.53 and \beta = 2.85 at the break luminosity 4.95 \times 10 ^ { 9 } L _ { \odot } .
We made extensive comparisons with various MIR LFs from several literatures .
Our results for local galaxies from the NEP region are generally consistent with other works for different fields over wide luminosity ranges .
The comparisons with the results from the NEP-Deep data as well as other LFs imply the luminosity evolution from higher redshifts towards the present epoch .