Testing the AGN-Starburst Connection in Seyfert Galaxies

Abstract

We use the CO band at 2.3 micron to constrain the populations of young stars in the central regions of Seyfert galaxies. We report new CO band spectroscopy of 46 Seyfert galaxies. In most cases, the observed CO indices appear diluted by the presence of a non-stellar component (most likely, warm dust surrounding the active nucleus). We used JHKL aperture photometry to estimate the non-stellar contribution at 2.3 micron. We successfully corrected the CO band for the dilution for 16 galaxies which were not dominated by the non-stellar component. Comparing with CO indices measured in elliptical and purely starbursting galaxies, we find no evidence for strong starbursts in the majority of these galaxies.

34 pages (including 4 figures), accepted for publication in ApJ Final version. Minor changes in figure captions, auffiliations

References in corpus (4)

• A subarcsecond resolution near-infrared study of Seyfert and `normal' galaxies: II. Morphology
• Symbiotic starburst-black hole AGN -- I. Isothermal hydrodynamics of the mass-loaded ISM
• Formation of Large-Scale Obscuring Wall and AGN Evolution Regulated by Circumnuclear Starbursts
• The Variability of Seyfert 1.8 and 1.9 Galaxies at 1.6 microns

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