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

Journal Article · Sun Oct 01 04:00:00 EDT 2017 · Astrophysical Journal

DOI:https://doi.org/10.3847/1538-4357/AA88A3· OSTI ID:22875736

Park, Songyoun; Woo, Jong-Hak; Park, Dawoo; Cho, Hojin; Jeon, Yiseul; Choi, Changsu; Im, Myungshin ^[1]; Romero-Colmenero, Encarni; Crawford, Steven M. ^[2]; Barth, Aaron J.; Pei, Liuyi ^[3]; Hickox, Ryan C. ^[4]; Sung, Hyun-Il ^[5]

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1. Department of Physics and Astronomy, Seoul National University, Seoul 08826 (Korea, Republic of)
2. South African Astronomical Observatory, P.O. Box 9, Observatory 7935, Cape Town (South Africa)
3. Department of Physics and Astronomy, 4129 Frederick Reines Hall, University of California, Irvine, CA 92697-4575 (United States)
4. Department of Physics and Astronomy, Dartmouth College, Hanover, NH 03755 (United States)
5. Korea Astronomy and Space Science Institute, Daejeon 34055 (Korea, Republic of)

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 ∼1 week cadence over two sets of four month-long observing period, while we obtained 80 epochs of 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 Hβ, by comparing the emission line light curve with the B-band continuum light curve using the cross-correlation function techniques. We determined the Hβ lag, τ{sub cent}=8.46{sub −2.14}{sup +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 Hβ line dispersion σ{sub line} = 668 ± 44 km s{sup −1} 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 {sub BH} = 3.13{sub −0.93}{sup +0.91}×10{sup 6} M {sub ⊙,} based on the Hβ time lag and velocity.

• OSTI ID: 22875736
• Journal Information: Astrophysical Journal, Journal Name: Astrophysical Journal Journal Issue: 2 Vol. 847; ISSN ASJOAB; ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
BLACK HOLES
COMPARATIVE EVALUATIONS
CORRELATION FUNCTIONS
DISPERSIONS
EMISSION
GALAXY NUCLEI
MASS
RESOLUTION
SEYFERT GALAXIES
SPECTRA
TELESCOPES
VELOCITY