Continuum reverberation mapping of the quasar PG 2130+099

Aims. We present the results of an intensive six-month optical continuum reverberation mapping campaign Seyfert 1 galaxy PG 2130+099 at redshift z = 0.063. The ground-based photometric monitoring was conducted on a daily basis with robotic 46 cm telescope WISE observatory located in Israel. Specially designed narrowband filters were used to observe central engine active galactic nucleus (AGN), avoiding line contamination from broad-line region (BLR). aim measure inter-band time lags across range and determine size-wavelength relation for this system. Methods. two methods, traditional point-spread function photometry recently developed proper image subtraction technique, independently perform extraction light curves. are measured several including interpolated cross-correlation function, -transformed discrete correlation von Neumann estimator, JAVELIN (in spectroscopic mode), MICA. Results. displays correlated variability range, we successfully detect significant up ∼3 days between multiband find that wavelength-dependent lags, τ ( λ ), generally follow )∝ 4/3 , as expected temperature radial profile T ∝ R −3/4 optically thick, geometrically thin accretion disk. Despite that, derived can also be fitted by 2 implying possibility slim, rather than thin, Using flux variation gradient method, determined AGN’s host-galaxy-subtracted rest frame 5100 Å luminosity our uncertainty ∼18% λL (2.40 ± 0.42)×10 44 erg s −1 ). While reprocessing model fit data reasonably well, disk sizes factor ∼2 − 6 larger theoretical predicted AGN estimate 2130+099. This result is agreement previous studies AGN/quasars suggests standard Shakura-Sunyaev theory has limitations describing disks.