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• W4313268967 abstract "ABSTRACT We study the Fourier time lags due to the Comptonization of disc-emitted photons in a spherical, uniform, and stationary X-ray corona, which located on the rotational axis of the black hole. We use monk, a general relativistic Monte Carlo radiative transfer code, to calculate Compton scattering of photons emitted by a thin disc with a Novikov–Thorne temperature profile. We find that the model time lags due to Comptonization remain constant up to a characteristic frequency and then rapidly decrease to zero at higher frequencies. We provide equations that can be used to determine the time lags and cross-spectra for a wide range of values for the corona radius, temperature, optical depth, height, and for various accretion rates and black hole masses. We also provide an equation for the X-ray luminosity of a single corona, as a function of its characteristics and location above the disc. Remarkably, the observed X-ray time lags of nearby, bright active galaxies can be successfully reproduced by inverse Comptonization process of multiple dynamic coronae." @default.
• W4313268967 created "2023-01-06" @default.
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• W4313268967 date "2022-12-16" @default.
• W4313268967 modified "2023-10-16" @default.
• W4313268967 title "A theoretical study of the time lags due to Comptonization and the constraints on the X-ray corona in AGNs" @default.
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• W4313268967 doi "https://doi.org/10.1093/mnras/stac3625" @default.
• W4313268967 hasPublicationYear "2022" @default.
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