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In this research, we provide a new, efficient method to select infrared (IR)active galatic nucleus (AGN). In the past, AGN selection in IR had beenestablished by many studies using color-color diagrams. However, those methodshave a problem in common that the number of bands is limited. The AKARI NorthEcliptic Pole (NEP) survey was carried out by the AKARI Infrared Camera (IRC),which has 9 filters in mid-IR with a continuous wavelength coverage from 2 to24$\mu$m$^{-1}$. Based on the intrinsic different mid-IR features of AGN andstar-forming galaxies (SFGs), we performed SED fitting to separate these twopopulations by the best-fitting model. In the X-ray AGN sample, our method bySED fitting selects 50$\%$ AGNs, while the previous method by colour criteriarecovers only 30$\%$ of them, which is a significant improvement. Furthermore,in the whole NEP deep sample, SED fitting selects two times more AGNs than thecolor selection. This may imply that the black hole accretion history could bemore stronger than people expected before.

AGN selection by 18-band SED fitting in mid-infrared in the AKARI NEP deep field