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Deep MIR surveys have revealed numerous strongly star-forming galaxies atredshift z~<2. Their MIR fluxes are produced by a combination of continuum andPAH emission features. The PAH features can dominate the total MIR flux, butare difficult to measure without spectroscopy. We aim to study star-forminggalaxies by using a blind spectroscopic survey at MIR wavelengths to understandevolution of their star formation rate (SFR) and specific SFR up to z~=0.5, bypaying particular attention to their PAH properties. We conducted alow-resolution (R~=50) slitless spectroscopic survey at 5-13um of 9umflux-selected sources (>0.3 mJy) around the North Ecliptic Pole with theInfrared Camera (IRC) onboard AKARI. After removing 11 AGN candidates by usingthe IRC photometry, we identified 48 PAH galaxies with PAH 6.2, 7.7, and 8.6umfeatures at z<0.5. The rest-frame optical-MIR spectral energy distributions(SEDs) based on CFHT and AKARI/IRC imaging covering 0.37-18um were produced,and analysed in conjunction with the PAH spectroscopy. We defined the PAHenhancement by using the luminosity ratio of the 7.7um PAH feature over the3.5um stellar component of the SEDs. The rest-frame SEDs of all PAH galaxieshave a universal shape with stellar and 7.7um bumps, except that the PAHenhancement significantly varies as a function of the PAH luminosities. Weidentified a PAH-enhanced population at z~>0.35, whose SEDs and luminositiesare typical of luminous infrared galaxies. They show particularly larger PAHenhancement at high luminosity, implying that they are vigorous star-forminggalaxies with elevated specific SFR. Our composite starburst model thatcombines a very young and optically very thick starburst with a very oldpopulation can successfully reproduce most of their SED characteristics,although we could not confirm this optically thick component from our spectralanalysis.

AKARI mid-infrared slitless spectroscopic survey of star-forming galaxies at $z\lesssim 0.5$