An Improved Method for Using Mg II to Estimate Black Hole Masses in Active Galactic Nuclei
We present a method for obtaining accurate black hole (BH) mass estimates from the Mg ii emission line in active galactic nuclei (AGNs). Employing the large database of AGN measurements from the Sloan Digital Sky Survey (SDSS) presented by Shen et al., we find that AGNs in the redshift range 0.3-0.9, for which a given object can have both Hβ and Mg ii line widths measured, display a modest but correctable discrepancy in Mg ii-based masses that correlates with the Eddington ratio. We use the...[Show more]
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