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Based on an updated Hbeta reverberation mapping (RM) sample of 44 nearbyactive galactic nuclei (AGN), we propose a novel approach for black hole (BH)mass estimation using two filtered luminosities computed from single-epoch (SE)AGN spectra around the Hbeta region. We found that the two optimal-filterluminosities extract virial information (size and virial velocity of the broadline region, BLR) from the spectra, justifying their usage in this empirical BHmass estimator. The major advantages of this new recipe over traditional SE BHmass estimators utilizing continuum luminosity and broad line width are: 1) ithas a smaller intrinsic scatter of 0.28 dex calibrated against RM masses; 2) itis extremely simple to use in practice, without any need to decompose thespectrum; 3) it produces unambiguous and highly repeatable results even withlow signal-to-noise spectra. The combination of the two luminosities can alsocancel out, to some extent, systematic luminosity errors potentially introducedby uncertainties in distance or flux calibration. In addition, we recalibratedthe traditional SE mass estimators using broad Hbeta full width at half maximum(FWHM) and monochromatic continuum luminosity at 5100A (L_5100). We found thatusing the best-fit slopes on FWHM and L_5100 (derived from fitting the BLRradius-luminosity relation and the correlation between rms line dispersion andSE FWHM, respectively) rather than simple assumptions (e.g., 0.5 for L_5100 and2 for FWHM) leads to more precise SE mass estimates, improving the intrinsicscatter from 0.41 dex to 0.36 dex with respect to the RM masses. We compareddifferent estimators and discussed their applications to the Sloan Digital SkySurvey (SDSS) quasar sample. Due to the limitations of the current RM sample,application of any SE recipe calibrated against RM masses to distant quasarsshould be treated with caution.

Single-Epoch Black Hole Mass Estimators For Broad-Line Active Galactic Nuclei: Recalibrating Hbeta with A New Approach