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We present herein galaxy number counts of the nine bands in the 2-24 micronrange on the basis of the AKARI North Ecliptic Pole (NEP) surveys. The numbercounts are derived from NEP-deep and NEP-wide surveys, which cover areas of 0.5and 5.8 deg2, respectively. To produce reliable number counts, the sources wereextracted from recently updated images. Completeness and difference betweenobserved and intrinsic magnitudes were corrected by Monte Carlo simulation.Stellar counts were subtracted by using the stellar fraction estimated fromoptical data. The resultant source counts are given down to the 80%completeness limit; 0.18, 0.16, 0.10, 0.05, 0.06, 0.10, 0.15, 0.16, and 0.44mJy in the 2.4, 3.2, 4.1, 7, 9, 11, 15, 18 and 24 um bands, respectively. Onthe bright side of all bands, the count distribution is flat, consistent withthe Euclidean Universe, while on the faint side, the counts deviate, suggestingthat the galaxy population of the distant universe is evolving. These resultsare generally consistent with previous galaxy counts in similar wavebands. Wealso compare our counts with evolutionary models and find them in goodagreements. By integrating the models down to the 80% completeness limits, wecalculate that the AKARI NEP-survey revolves 20%-50% of the cosmic infraredbackground, depending on the wavebands.

The 2 to 24 micron source counts from the AKARI North Ecliptic Pole survey