Central black hole masses inferred from the reverberation mapping of emission lines from Active Galactic Nuclei fall on the same relationship with host bulge velocity dispersion as masses from stellar dynamical modeling. The velocity widths of both broad lines and forbidden lines may be used as moderate-scatter proxies for black hole mass determination in moderate luminosity AGNs. A preliminary examination of SDSS spectra of type-1 AGN shows a similar relationship between the broad-line proxy for black hole mass and the forbidden-line proxy for bulge velocity dispersion.
Coevolution of Black Holes and Galaxies
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