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We provide an updated calibration of CIV $\lambda1549$ broad emissionline-based single-epoch (SE) black hole (BH) mass estimators for activegalactic nuclei (AGNs) using new data for six reverberation-mapped AGNs atredshift $z=0.005-0.028$ with BH masses (bolometric luminosities) in the range$10^{6.5}-10^{7.5}$ $M_{\odot}$ ($10^{41.7}-10^{43.8}$ erg s$^{\rm -1}$). Newrest-frame UV-to-optical spectra covering 1150-5700 \AA\ for the six AGNs wereobtained with the Hubble Space Telescope (HST). Multi-component spectraldecompositions of the HST spectra were used to measure SE emission-line widthsfor the CIV, MgII, and H$\beta$ lines as well as continuum luminosities in thespectral region around each line. We combine the new data with similarmeasurements for a previous archival sample of 25 AGNs to derive the mostconsistent and accurate calibrations of the CIV-based SE BH mass estimatorsagainst the H$\beta$ reverberation-based masses, using three different measuresof broad-line width: full-width at half maximum (FWHM), line dispersion($\sigma_{\rm line}$) and mean absolute deviation (MAD). The newly expandedsample at redshift $z=0.005-0.234$ covers a dynamic range in BH mass(bolometric luminosity) of $\log\ M_{\rm BH}/M_{\odot} = 6.5-9.1$ ($\log\L_{\rm bol}/$erg s$^{\rm -1}=41.7-46.9$), and we derive the new CIV-based massestimators using a Bayesian linear regression analysis over this range. Wegenerally recommend the use of $\sigma_{\rm line}$ or MAD rather than FWHM toobtain a less biased velocity measurement of the CIV emission line, because itsnarrow-line component contribution is difficult to decompose from thebroad-line profile.

Extending the Calibration of CIV-Based Single-Epoch Black Hole Mass Estimators for Active Galactic Nuclei