Abstract
The Geant 4.8.1 program package has been used to carry out Monte Carlo simulations of resonance features arising in gamma-ray spectra due to the passage of the photons through a large amount of neutral, stationary material under conditions corresponding to those in active galactic nuclei (AGNs). The dependences of the depth and shape of resonance features on the optical depth and geometry of the absorbing material, as well as parameters of the initial spectrum, are analyzed. Special attention is paid to the dependence of the spectrum on the viewing angle for the observations relative to the symmetry axis of a beam of gamma-rays, for viewing angles from fractions of a degree to several tens of degrees. It is shown that Δ-resonance absorption with appreciable depths (>10%) can appear in the gamma-ray spectra of AGNs only if observations are made at small angles (<0.2°) to the beam axis.
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