X-ray reprocessing by the accretion disc in Fairall 9 simultaneously explains the SED, UV/optical power spectra, and interband time lags only if the corona is powered externally rather than by accretion.
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X-ray disc reverberation modelling of the X-ray/UV/optical spectral/timing properties of Fairall 9
X-ray reprocessing by the accretion disc in Fairall 9 simultaneously explains the SED, UV/optical power spectra, and interband time lags only if the corona is powered externally rather than by accretion.