Speaker
Description
Reverberation mapping (RM) of Active Galactic Nuclei (AGNs) is the primary method to measure AGN broad line region (BLR) sizes and black hole (BH) masses. Most objects in the current H$\beta$ RM sample are low-to-intermediate luminosity AGNs with only a few objects having $L_{5100}\geq10^{44.5}$ erg/s. Here we present the latest results from our 6-year Seoul National University AGN Monitoring Project (SAMP). With hundreds of nights of regularly sampled spectroscopic/photometric observations, we successfully obtain reliable H$\beta$ lags and BH masses for 24 objects in the luminosity range of $L_{5100} = 10^{44.1\sim45.6}$ erg/s. The BLR sizes of these objects are generally smaller than the expectation from Bentz et al. relation. By applying an uniform lag analysis to literature H$\beta$ RM light curves and selecting reliable lag measurements to combine with SAMP measurements, we find the current H$\beta$ size-luminosity relation has a slope of $0.41\pm0.02$ with an intrinsic scatter of 0.19 dex. We confirm that the accretion rate / UV-optical spectral energy distribution is related to this shallower slope. In addition, we will present the H$\beta$ velocity resolved lag measurements for $\sim20$ AGNs and discuss the implication of these results on the BLR properties.
