The Hα Broadband Photometric Reverberation Mapping of Four Seyfert 1 Galaxies

Broadband photometric reverberation mapping (PRM) have been investigated for AGNs in recent years, but mostly on accretion disk continuum RM. Due to the small fraction of broad emission lines broadband, PRM is very challenging. Here we present an ICCF-Cut method broadband obtain H$\alpha$ line lag and apply it four Seyfert 1 galaxies, MCG+08-11-011, NGC 2617, 3C 120 5548. All them high quality lightcurves with daily/sub-daily cadence, which enables us extract from band by subtracting contributions host galaxy. Their extracted are compared lagged lightcurves, as well H$\beta$ obtained spectroscopic RM (SRM) at same epochs. The consistency these comparison SRM lags provide supports AGNs, a range 9 19 days, ICCF-Cut, JAVELIN $\chi^2$ methods. simulations evaluate reliability comparisons between indicate that results can ensure derived lags. These methods may be used estimate region sizes black hole masses large sample multi-epoch cadence surveys such LSST future.