Dust reverberation mapping and light-curve modelling of Zw229-015

Multiwavelength variability studies of active galactic nuclei (AGN) can be used to probe their inner regions which are not directly resolvable. Dust reverberation mapping (DRM) estimates the size dust emitting region by measuring delays between infrared (IR) response in optical light curves. We measure DRM lags Zw229-015 ground-based and Kepler curves concurrent IR Spitzer 3.6 4.5 $\mu$m from 2010-2015, finding an overall mean rest-frame lag 18.3 $\pm$ days. Each combination curve returns that consistent with each other within 1$\sigma$, implies different wavelengths dominated same hot emission. The measured for found consistently smaller than predictions using lag-luminosity relationship. Also, emission actually depends on geometry structure as well, so we use Markov chain Monte Carlo (MCMC) modelling simulate distribution further estimate these structural geometrical properties. find a large increase flux 2011-2012 observation seasons, is more dramatic curve, well simulated single component. When excluding this flux, suggests distributed extended flat disk, finds inclination angle 49$^{+3}_{-13}$ degrees.