Characterizing optical variability of NLS1s with ZTF

Large variability surveys, such as the Zwicky Transient Facility enable us to study AGN variability on timescales of weeks to several years, for hundreds of thousands of objects with very homogeneous data. This huge data set allows us to probe the parameter space in detail, showing how the variability properties depend on several parameters independently, which will help to constrain the physical models of their variability. In this talk I will show the variability features we have obtained from carefully constructed ligthcurves from ZTF images, optimized to constrain the nuclear flux variability in extended galaxies. These, matched to the spectroscopic properties measured by DESI QSO-related value-added catalogs reveal how the variability amplitudes and timescales of NLS1 compare to BLS1 controlling simultaneously for magnitude and redshift. We also show how our random forest approach to AGNselection sometimes fails to recognize nearby NLS1 and propose ideas to remedy this