26-30 June 2023
Centro Congressi Federico II
Europe/Rome timezone

Investigating the high-luminosity end of the H beta size-luminosity relation based on the 6-year Seoul National University Monitoring Project (SAMP)

27 Jun 2023, 10:15
Aula Magna (Centro Congressi Federico II)

Aula Magna

Centro Congressi Federico II

Via Partenope, 36, Napoli, Italy
Contributed talk Emission Line variability


Shu Wang (Seoul National University)


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.

Primary authors

Shu Wang (Seoul National University) Dr. Jong-Hak Woo (Seoul National University) SAMP collaboration

Presentation Materials

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