Reverberation Mapping of PG 0934+013 with the Southern African Large Telescope

Abstract

We present the variability and time lag measurements of PG 0934+013 based on a photometric and spectroscopic monitoring campaign over a two year period. We obtained 46 epochs of data from the spectroscopic campaign, which was carried out using the Southern African Large Telescope with $\sim$1 week cadence over two sets of 4 month-long observing period, while we obtained 80 epochs of \textit{B}-band imaging data using a few 1-m class telescopes. Due to the seven month gap between the two observing periods, we separately measured the time lags of broad emission lines including H$\beta$, by comparing the emission line light curve with the \textit{B}-band continuum light curve using the cross-correlation function techniques. We determined the H$\beta$ lag, ${\tau }_{\mathrm{cent}}=8.46_{-2.14}^{+2.08}$ days in the observed-frame based on Year 2 data, while the time lag from Year 1 data was not reliably determined. Using the rms spectrum of Year 2 data, we measured the \Hb\ line dispersion \sigmaline = 668 $\pm$ 44 \kms\ after correcting for the spectral resolution. Adopting a virial factor f = 4.47 from Woo et al. 2015, we determined the black hole mass M${}_{BH}$ = $3.13_{-0.93}^{+0.91}\times 10^6$ \msun based on the \Hb\ time lag and velocity.

13 pages, 10 figures, ApJ in press

References in corpus (11)

• The bulk of the black hole growth since z~1 occurs in a secular universe: No major merger-AGN connection
• Is Quasar Optical Variability a Damped Random Walk?
• The black hole mass - stellar velocity dispersion relation of narrow-line Seyfert 1 galaxies
• Supermassive Black Holes with High Accretion Rates in Active Galactic Nuclei. IV. H$\beta$ Time Lags and Implications for Super-Eddington Accretion
• A Reverberation-Based Mass for the Central Black Hole in NGC 4151
• The Lick AGN Monitoring Project 2011: Spectroscopic Campaign and Emission-Line Light Curves
• Cosmic Evolution of Black Holes and Spheroids. I: The M_BH-sigma Relation at z=0.36
• Cosmic Evolution of Black Holes and Spheroids. II: Scaling Relations at z=0.36
• The UV Continuum of Quasars: Models and SDSS Spectral Slopes
• Supermassive Black Holes with High Accretion Rates in Active Galactic Nuclei. III. Detection of Fe II Reverberation in Nine Narrow-Line Seyfert 1 Galaxies
• Cosmic Evolution of Black Holes and Spheroids. V. The Relation Between Black Hole Mass and Host Galaxy Luminosity for a Sample of 79 Active Galaxies

Cited by in corpus (7)

• Broad line region and black hole mass of PKS 1510-089 from spectroscopic reverberation mapping
• A novel black-hole mass scaling relation based on coronal gas, and its dependence with the accretion disc
• Calibrating Mg II-based black-hole mass estimators using Low-to-High-Luminosity Active Galactic Nuclei
• The Seoul National University AGN monitoring project. II. BLR size and black hole mass of two AGNs
• Variability and the size-luminosity relation of the intermediate mass AGN in NGC 4395
• Spectroscopic reverberation mapping of Quasar PKS 0736+017: Broad-Line Region and Black-hole Mass
• Emission-Line and Continuum Reverberation Mapping of the NLS1 Galaxy WPVS 48