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Eigenvector 1: An Optimal Correlation Space for Active Galactic Nuclei

Eigenvector 1: An Optimal Correlation Space for Active Galactic Nuclei

We identify a correlation space involving optical and UV emission-line parameters as well as the soft X-ray spectral index that provides optimal discrimination between all principal classes of active galactic nuclei (AGNs). Most of the sources in our three high-quality data samples show a strong intercorrelation with narrow-line Seyfert 1 …