Supermassive Black Holes with High Accretion Rates in Active Galactic Nuclei. XIV. Long-duration High-cadence Reverberation Mapping Results for 11 PG Quasars

We report the results of a long-duration high-cadence reverberation mapping campaign of a second batch of 11 PG quasars using the 2.2 m telescope at the Calar Alto Observatory. This follows a similar earlier study of another sample of 15 objects reported by C. Hu et al. (2021). Among the 11 PG quasars, eight objects have the Hβ time lags measured for the first time, while the other three objects were observed in previous campaigns but only had highly uncertain Hβ-lag measurements. Long-term light curves are presented of photometric V-band, spectroscopic 5100 Å continuum, and the Hβ emission line, lasting for ∼3-6 yr with a cadence of ∼6-14 days. Accurate Hβ time lags ranging from ∼20 to 150 days in the rest frame are obtained. The estimated virial masses of the central supermassive black holes range from ∼(3-300) × 10⁷M_⊙. Combining these results with those reported in C. Hu et al. (2021), we now have 26 PG quasars, with representative properties, having reliable Hβ time-lag measurements from our long-duration high-cadence campaign. A tentative fit to the relation between the Hβ time lag and the continuum luminosity for these 26 objects gives a slope of 0.53.