The Accuracy of Supermassive Black Hole Masses Determined by the Single-Epoch-Spectrum (Dibai) Method

Abstract

The first set of supermassive black hole mass estimates, published from 1980 to 1984 by E. A. Dibai, are shown to be in excellent agreement with recent reverberation-mapping estimates. Comparison of the masses of 17 AGNs covering a mass range from about 10^6 to 10^9 solar masses shows that the Dibai mass estimates agree with reverberation-mapping mass estimates to significantly better than 0.3 dex and were, on average, only 0.14 dex (~ 40%) systematically lower than masses obtained from reverberation mapping. This surprising agreement with the results of over a quarter of a century ago has important implication for the structure and kinematics of AGNs and implies that AGNs are very similar. Our results give strong support to the use of the single-epoch-spectrum (Dibai) method for investigating the co-evolution of supermassive black holes and their host galaxies.

To appear in Astron. Letters. 5 pages, 1 figure Minor corrections made and some additional references and discussion added

References in corpus (8)

• Determining Central Black Hole Masses in Distant Active Galaxies and Quasars. II. Improved Optical and UV Scaling Relationships
• Biases in Virial Black Hole Masses: An SDSS Perspective
• The Radius-Luminosity Relationship for Active Galactic Nuclei: The Effect of Host-Galaxy Starlight on Luminosity Measurements
• The Mass Function of Active Black Holes in the Local Universe
• The Black Hole Mass - Galaxy Bulge Relationship for QSOs in the SDSS DR3
• Systematic Uncertainties in Black Hole Masses Determined from Single Epoch Spectra
• Line Shifts, Broad-Line Region Inflow, and the Feeding of AGNs
• NGC 5548: The AGN Energy Budget Problem and the Geometry of the Broad-Line Region and Torus

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