Astrophys. J., 839, 93-93 (2017/April-3)
Extending the calibration of C IV-based single-epoch black hole mass estimators for active galactic nuclei.
PARK D., BARTH A.J., WOO J.-H., MALKAN M.A., TREU T., BENNERT V.N., ASSEF R.J. and PANCOAST A.
Abstract (from CDS):
We provide an updated calibration of C IV λ1549 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 106.5–107.5M☉ (1041.7–1043.8 erg s–1). New rest-frame UV-to-optical spectra covering 1150-5700 Å 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 Hβ 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 Hβ reverberation-based masses, using three different measures of broad-line width: full width at half maximum (FWHM), line dispersion (σline), 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 logMBH/M☉=6.5–9.1 (logLbol/ 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 σline 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.
© 2017. The American Astronomical Society. All rights reserved.
galaxies: active - galaxies: nuclei - methods: statistical - methods: statistical
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