The Seoul National University AGN Monitoring Project. II. BLR Size and Black Hole Mass of Two AGNs
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The Seoul National University AGN Monitoring Project. II. BLR Size and Black Hole Mass of Two AGNs

  • Author(s): Rakshit, Suvendu;
  • Woo, Jong-Hak;
  • Gallo, Elena;
  • Hodges-Kluck, Edmund;
  • Shin, Jaejin;
  • Jeon, Yiseul;
  • Bae, Hyun-Jin;
  • Baldassare, Vivienne;
  • Cho, Hojin;
  • Cho, Wanjin;
  • Foord, Adi;
  • Kang, Daeun;
  • Kang, Wonseok;
  • Karouzos, Marios;
  • Kim, Minjin;
  • Kim, Taewoo;
  • Le, Huynh Anh N;
  • Park, Daeseong;
  • Park, Songyoun;
  • Son, Donghoon;
  • Sung, Hyun-il;
  • Bennert, Vardha N;
  • Malkan, Matthew A
  • et al.
Abstract

Active galactic nuclei (AGNs) show a correlation between the size of the broad line region (BLR) and the monochromatic continuum luminosity at 5100 \AA, allowing black hole mass estimation based on single-epoch spectra. However, the validity of the correlation is yet to be clearly tested for high-luminosity AGNs. We present the first reverberation-mapping results of the Seoul National University AGN monitoring program (SAMP), which is designed to focus on luminous AGNs for probing the high end of the size-luminosity relation. We report time lag measurements of two AGNs, namely, 2MASS J10261389+5237510 and SDSS J161911.24+501109.2, using the light curves obtained over a $\sim$1000 day period with an average cadence of $\sim$10 and $\sim$20 days, respectively for photometry and spectroscopy monitoring. Based on a cross-correlation analysis and H$\beta$ line width measurements, we determine the H$\beta$ lag as $41.8^{+4.9}_{-6.0}$ and $52.6^{+17.6}_{-14.7}$ days in the observed-frame, and black hole mass as $3.65^{+0.49}_{-0.57} \times 10^7 M_{\odot}$ and $23.02^{+7.81}_{-6.56} \times 10^7 M_{\odot}$, respectively for 2MASS J1026 and SDSS J1619.

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