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We present near-infrared K- (1.9-2.5 micrometer) and L- (2.8-4.2 micrometer)band spectroscopy of 22 Seyfert nuclei. We use two methods to investigate thepresence of nuclear starbursts: (1) the Polycyclic Aromatic Hydrocarbon (PAH)emission feature at lambda_rest = 3.3 micrometer in the rest frame of L-bandspectrum (a starburst indicator) and (2) the CO absorption feature atlambda_rest = 2.3-2.4 micrometer in the rest frame of the K-band spectrum,originating in the CO molecule. We clearly detected the 3.3 micrometer PAHemission 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 1galaxies. We interpret the discrepancy as resulting from relative strength ofstellar emission because AGN emission is affected by dust extinction. The 3.3micrometer PAH emission luminosity (L_3.3PAH) distributions for the Seyfert 1sand Seyfert 2s are very similar when normalized to the AGN power.Star-formation rates estimated from L_3.3PAH could be large enough to inflatethe dusty torus by supernova explosion. We find that L_3.3PAH positivelycorrelates with N-band luminosity with small aperture over a wide AGNluminosity range, and is independent of physical area we probed. The resultssuggest that nuclear region has a concentration of star formation and the starformation would control AGN activity.

publications of the astronomical society of japan

Comparison of AGN and Nuclear Starburst Activity in Seyfert 1 and 2  Galaxies over a Wide Luminosity Range Based on Near-infrared 2-4 micrometer  Spectroscopy