z<0.8 AGNs from MQC with robust lags from ZTF

We select a sample of 94 type 1 AGNs at z<0.8 with significant and consistent inter-band lags based on the interpolated cross-correlation function method and the Bayesian method JAVELIN. Within the framework of the "lamp-post" reprocessing model, our findings are: (1) The continuum emission (CE) sizes inferred from the data are larger than the disk sizes predicted by the standard thin-disk model.

(2) For a subset of the sample, the CE size exceeds the theoretical limit of the self-gravity radius (12 lt-days) for geometrically thin disks. (3) The CE size scales with continuum luminosity as R_CE_{propto}L^0.48+/-0.04^ with a scatter of 0.2dex, analogous to the well-known radius-luminosity relation of broad H{beta}. These findings suggest a significant contribution of diffuse continuum emission from the broad-line region (BLR) to AGN continuum lags.