Search for Active Galactic Nuclei using AKARI Mid-infrared All-Sky Survey

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Scientific paper

Many observations have found evidence of the presence of a large number of heavily obscured active galactic nuclei (AGNs). These AGNs contribute to the local black hole mass density, and are potentially important contributors to the growth of supermassive black holes throughout the history of the universe. However, the nature of this population, even in the local universe, is only poorly understood, because of the strong selection bias against finding them at optical wavelengths. Mid-infrared AGN searches can overcome this obstacle by penetrating through dust extinction to identify most of the AGN population, including Type 2 Seyferts and buried AGNs. Using AKARI Mid-infrared All-Sky Survey and the follow-up observations, we are performing AGN search as well as the study of AGN natures. We will present our discovery of two obscured AGNs that do not show any AGN features in other bands. In addition, we will present new mid-infrared luminosity functions of AGNs.

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