A theoretical study of the time lags due to Comptonization and the constraints on the X-ray corona in AGNs

ABSTRACT We study the Fourier time lags due to Comptonization of disc-emitted photons in a spherical, uniform, and stationary X-ray corona, which located on rotational axis black hole. use monk, general relativistic Monte Carlo radiative transfer code, calculate Compton scattering emitted by thin disc with Novikov–Thorne temperature profile. find that model remain constant up characteristic frequency then rapidly decrease zero at higher frequencies. provide equations can be used determine cross-spectra for wide range values corona radius, temperature, optical depth, height, various accretion rates hole masses. also an equation luminosity single as function its characteristics location above disc. Remarkably, observed nearby, bright active galaxies successfully reproduced inverse process multiple dynamic coronae.