Halpha, g- and r- ZTF light curves of AGNs

Extending the work, we enlarge our sample to the Zwicky Transient Facility (ZTF) database. We adopt two criteria to select 123 type 1 active galactic nuclei (AGNs) with sufficient variability and smooth light curves from 3537 AGNs at z<0.09 with more than 100 epoch observations in the g and r bands from the ZTF database.

We calculate the H{alpha} time lags for 23 of them that have previous spectroscopic reverberation mapping (SRM) results using the ICCF-Cut, Just Another Vehicle for Estimating Lags In Nuclei (JAVELIN), and {chi}2 methods. Our obtained H{alpha} time lags are slightly larger than the H{beta} time lags, which is consistent with the previous SRM results and the theoretical model of the AGN broad-line region. The comparisons between the SRM and PRM lag distributions and between the subtracted emission line light curves indicate that after selecting AGNs with the two criteria, combining the ICCF-Cut, JAVELIN, and {chi}2 methods provides an efficient way to get the reliable H{alpha} lags from the broadband PRM.