Kavli Affiliate: Erin Kara
| First 5 Authors: Christos Panagiotou, Iossif Papadakis, Erin Kara, Marios Papoutsis, Edward M. Cackett
| Summary:
Over the last years, a number of broadband reverberation mapping campaigns
have been conducted to explore the short-term UV and optical variability of
nearby AGN. Despite the extensive data collected, the origin of the observed
variability is still debated in the literature. Frequency-resolved time lags
offer a promising approach to distinguish between different scenarios, as they
probe variability on different time scales. In this study, we present the
expected frequency-resolved lags resulting from X-ray reprocessing in the
accretion disk. The predicted lags are found to feature a general shape that
resembles that of observational measurements, while exhibiting strong
dependence on various physical parameters. Additionally, we compare our model
predictions to observational data for the case of NGC 5548, concluding that the
X-ray illumination of the disk can effectively account for the observed
frequency-resolved lags and power spectra in a self-consistent way. To date,
X-ray disk reprocessing is the only physical model that has successfully
reproduced the observed multi-wavelength variability, in both amplitude and
time delays, across a range of temporal frequencies.
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