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Paper: Buried AGNs in Nearby Ultraluminous Infrared Galaxies: The Origin of Galaxy Downsizing
Volume: 418, AKARI, a Light to Illuminate the Misty Universe
Page: 217
Authors: Imanishi, M.; Nakagawa, T.; Ohyama, Y.; Shirahata, M.; Wada, T.; Onaka, T.
Abstract: We present the results of our systematic infrared 2.5–35 μm low-resolution spectroscopy of ultraluminous infrared galaxies (ULIRGs), using Subaru, AKARI, and Spitzer. We detected the signatures of optically-elusive, but intrinsically luminous, buried AGNs in a significant fraction of ULIRGs classified optically as non-Seyferts. The energetic importance of buried AGN increases with increasing galaxy infrared luminosity, which may support the widely-proposed AGN feedback scenario as the origin of the galaxy downsizing phenomenon.
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