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Paper: Distinguishing Active Galactic Nuclei and Star Formation
Volume: 390, Pathways Through an Eclectic Universe
Page: 283
Authors: Groves, B.; Kewley, L.
Abstract: Using the large emission-line galaxy sample from the Sloan Digital Sky Survey we show that star-forming galaxies, Seyferts, and low ionization nuclear emission-line regions (LINERs) form clearly separated branches on the standard optical diagnostic diagrams. We derive a new empirical classification scheme that cleanly separates these emission-line galaxies, using strong optical emission lines. Using this classification, we identify a few distinguishing host galaxy properties in each class, which, along with the emission-line analysis, suggest continuous evolution from one class to another. As a final note, we introduce models of both star-forming galaxies and AGN narrow-line regions that can explain the distribution of galaxies on standard emission-line ratio diagrams and possibly suggest new diagnostics across the emission spectrum.
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