The Seoul National University AGN monitoring project. II. BLR size and black hole mass of two AGNs

Abstract

Active galactic nuclei (AGNs) show a correlation between the size of the broad line region (BLR) and the monochromatic continuum luminosity at 5100 Å, 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 $41.8_{-6.0}^{+4.9}$ and $52.6_{-14.7}^{+17.6}$ days in the observed-frame, and black hole mass as $3.65_{-0.57}^{+0.49}\times 10^7{M}_{\odot }$ and $23.02_{-6.56}^{+7.81}\times 10^7{M}_{\odot }$, respectively for 2MASS J1026 and SDSS J1619.

14 pages; accepted by ApJ

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Cited by in corpus (2)

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