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Paper: Comparison of Nuclear Starburst Luminosities Between Seyfert 1 and 2 Galaxies, Based on Infrared 3–4 μm Spectroscopy
Volume: 381, The Second Annual Spitzer Science Center Conference: Infrared Diagnostics of Galaxy Evolution
Page: 474
Authors: Imanishi, M.
Abstract: We report the results of infrared L-band (3–4 μm) slit spectroscopy of 23 Seyfert 1 and 32 Seyfert 2 galaxies in the CfA and 12 μm samples. A polycyclic aromatic hydrocarbon (PAH) emission feature at 3.3 μm is primarily used to investigate putative nuclear starbursts in dusty tori around central active galactic nuclei (AGNs). The 3.3 μm PAH emission is detected in 10 Seyfert 1 (=43%) and 11 Seyfert 2 (=34%) nuclei. The magnitudes of nuclear starbursts are quantitatively estimated from the observed 3.3 μm PAH emission luminosities. We find that there is no significant difference in nuclear starburst to AGN luminosity ratios between Seyfert 1 and 2 galaxies, and that nuclear starburst luminosity positively correlates with AGN power in both types of Seyferts. Our results favor a slightly-modified AGN unification model, which predicts that nuclear starbursts occurring in the dusty tori of Seyferts are physically connected to the central AGNs.
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