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Date and Time of the Query: 2018-07-21 T06:32:01 PDT
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For refcode 2010PASJ...62.1509O:
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NED Abstract

Copyright by Astronomical Society of Japan. 2010PASJ...62.1509O Comparison of AGN and Nuclear Starburst Activity in Seyfert 1 and 2 Galaxies over a Wide Luminosity Range Based on Near-Infrared 2-4 micron Spectroscopy Oi, Nagisa; Imanishi, Masatoshi; Imase, Keisuke Abstract. We present near-infrared K- (1.9-2.5 micron) and L- (2.8-4.2 micron) band spectroscopy of 22 Seyfert nuclei. We used two methods to investigate the presence of nuclear starbursts: (1) the Polycyclic Aromatic Hydrocarbon (PAH) emission feature at {lambda}_rest_ = 3.3 micron in the rest frame of the K-band spectrum (a starburst indicator) and (2) the CO absorption feature at {lambda}_rest_ = 2.3-2.4 micron in the rest frame of the K-band spectrum, originating in the CO molecule. We clearly detected the 3.3 micron PAH emission features in five objects and the CO absorption features in 17 objects. Seyfert 2 galaxies tend to show bluer K - L colors compared with Seyfert 1 galaxies. We interpret the discrepancy as resulting from the relative strength of stellar emission because AGN emission is affected by dust extinction. The 3.3 micron PAH emission luminosity (L_3.3PAH_) distributions for the Seyfert 1s and Seyfert 2s are very similar when normalized to the AGN power. The star-formation rates estimated from L_3.3PAH_ could be large enough to inflate the dusty torus by a supernova explosion. We find that L_3.3PAH_ positively correlates with the N-band luminosity with small aperture over a wide AGN luminosity range, and is independent of the physical area we probed. The results suggest that the nuclear region has a concentration of star formation and it would control the AGN activity. Key words: galaxies: active, galaxies: nuclei, galaxies: Seyfert, galaxies: starburst, infrared: galaxies
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