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Date and Time of the Query: 2019-06-24 T18:49:20 PDT
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For refcode 2013ApJ...770...87P:
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2013ApJ...770...87P Calibrating C-IV-based Black Hole Mass Estimators Park, Daeseong; Woo, Jong-Hak; Denney, Kelly D.; Shin, Jaejin Abstract. We present the single-epoch black hole mass estimators based on the C IV lambda1549 broad emission line, using the updated sample of the reverberation-mapped active galactic nuclei and high-quality UV spectra. By performing multi-component spectral fitting analysis, we measure the C IV line widths (FWHM_C IV_ and line dispersion, sigma_C IV_) and the continuum luminosity at 1350 A (L_1350_) to calibrate the C-IV-based mass estimators. By comparing with the Hbeta reverberation-based masses, we provide new mass estimators with the best-fit relationships, i.e., M_BH is proportional to L_{1350}_^{0.50+/- 0.07} {sigma}_{C\,\scriptsize{IV}_}^{2} and M_BH is proportional to L_{1350}_^{0.52+/- 0.09}\,FWHM_{C\,\scriptsize{IV}_}^{0.56+/- 0.48}. The new C-IV-based mass estimators show significant mass-dependent systematic difference compared to the estimators commonly used in the literature. Using the published Sloan Digital Sky Survey QSO catalog, we show that the black hole mass of high-redshift QSOs decreases on average by ~0.25 dex if our recipe is adopted. Key words: black hole physics, galaxies: active, galaxies: nuclei, methods: statistical
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