Active Galactic Nuclei with Ultra-fast Outflows Monitoring Project: The Broad-line Region of Mrk 79 as a Disk Wind

Abstract

We developed a spectroscopic monitoring project to investigate the kinematics of the broad-line region (BLR) in active galactic nuclei (AGN) with ultra-fast outflows (UFOs). Mrk~79 is a radio-quiet AGN with UFOs and warm absorbers, had been monitored by three reverberation mapping (RM) campaigns, but its BLR kinematics is not understood yet. In this paper, we report the results from a new RM-campaign of Mrk~79, which was undertaken by Lijiang 2.4-m telescope. Mrk~79 is seeming to come out the faint state, the mean flux approximates a magnitude fainter than historical record. We successfully measured the lags of the broad emission lines including H$\beta \lambda 4861$, H$\gamma \lambda 4340$, He II $\lambda 4686$ and He I $\lambda 5876$ with respect to the varying AGN continuum. Based on the broad H$\beta \lambda 4861$ line, we measured black hole (BH) mass of $M_{\bullet }=5.13_{-1.55}^{+1.57}\times 10^7{M}_{\odot }$, estimated accretion rates of ${\dot{M}}_{\bullet }=(0.05\pm 0.02)L_{\mathrm{Edd}}{c}^{-2}$, indicating that Mrk~79 is a sub-Eddington accretor. We found that Mrk~79 deviates from the canonical Radius$-$Luminosity relationship. The marginal blueshift of the broad He II $\lambda 4686$ line detected from rms spectrum indicates outflow of high-ionization gas. The velocity-resolved lag profiles of the broad H$\gamma \lambda 4340$, H$\beta \lambda 4861$, and He I $\lambda 5876$ lines show similar signatures that the largest lag occurs in the red wing of the lines then the lag decreases to both sides. These signatures should suggest that the BLR of Keplerian motion probably exists the outflow gas motion. All findings including UFOs, warm absorbers, and the kinematics of high- and low-ionization BLR, may provide an indirect evidence that the BLR of Mrk~79 probably originates from disk wind.

21 pages, 16 figures, accepted for publication in ApJ

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• Velocity-resolved Reverberation Mapping of Changing-look Active Galactic Nucleus NGC~4151 During Outburst Stage: Evidence for Kinematics Evolution of Broad-line Region
• Radiation hydrodynamics models of Active Galactic Nuclei: Beyond the central parsec
• Supermassive Black Hole and Broad-line Region in NGC~5548: Results from Five-season Reverberation Mapping
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• Compact Molecular Gas Distribution in Quasar Host Galaxies
• Velocity-resolved Reverberation Mapping of Changing-look Active Galactic Nucleus NGC 4151 during Outburst Stage. II. Four Season Observation Results
• Analytical Model of Disk Evaporation and State Transitions in Accreting Black Holes
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• Spiral Arms in Broad-line Regions of Active Galactic Nuclei. II. Loosely Wound Cases: Reverberation Properties
• A correction method for the telluric absorptions and application to Lijiang Observatory
• Velocity-Resolved Ionization Mapping of Broad Line Region. I. Insights into Diverse Geometry and Kinematics
• Rarefied Broad-Line Regions in Active Galactic Nuclei: Anomalous Responses in Reverberation Mapping and Implications for Weak Emission-Line Quasars
• Reverberation Mapping of Two Luminous Quasars: the Broad-line Region Structure and Black Hole Mass