NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-08-24 T02:27:08 PDT
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For refcode 2017ApJ...839...93P:
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Copyright by American Astronomical Society. Reproduced by permission
2017ApJ...839...93P Extending the Calibration of C IV-based Single-epoch Black Hole Mass Estimators for Active Galactic Nuclei Park, Daeseong; Barth, Aaron J.; Woo, Jong-Hak; Malkan, Matthew A.; Treu, Tommaso; Bennert, Vardha N.; Assef, Roberto J.; Pancoast, Anna Abstract. We provide an updated calibration of C IV lambda 1549 broad emission line--based single-epoch (SE) black hole (BH) mass estimators for active galactic nuclei (AGNs) using new data for six reverberation-mapped AGNs at redshift z=0.005{--}0.028 with BH masses (bolometric luminosities) in the range {10}^6.5^{--}{10}^7.5^ {M}_o_ ({10}^41.7^{--}{10}^43.8^ erg s^-1^). New rest-frame UV-to-optical spectra covering 1150--5700 A for the six AGNs were obtained with the Hubble Space Telescope (HST). Multicomponent spectral decompositions of the HST spectra were used to measure SE emission-line widths for the C IV, Mg II, and Hbeta lines, as well as continuum luminosities in the spectral region around each line. We combine the new data with similar measurements for a previous archival sample of 25 AGNs to derive the most consistent and accurate calibrations of the C IV-based SE BH mass estimators against the Hbeta reverberation-based masses, using three different measures of broad-line width: full width at half maximum (FWHM), line dispersion ({sigma}_{line_}), and mean absolute deviation (MAD). The newly expanded sample at redshift z=0.005{--}0.234 covers a dynamic range in BH mass (bolometric luminosity) of {log}{M}_{BH_}/{M}_o_=6.5{--}9.1 ({log}{L}_{bol_}/ erg s^-1^ = 41.7{--}46.9), and we derive the new C IV-based mass estimators using a Bayesian linear regression analysis over this range. We generally recommend the use of {sigma}_{line_} or MAD rather than FWHM to obtain a less biased velocity measurement of the C IV emission line, because its narrow-line component contribution is difficult to decompose from the broad-line profile. Based on observations made with the NASA/ESA Hubble Space Telescope, obtained at the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS 5-26555. These observations are associated with program GO-12922. Key words: galaxies: active, galaxies: nuclei, methods: statistical
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