Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...440..128j&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 440, no. 1, p. 128-131
Astronomy and Astrophysics
Astronomy
4
Active Galactic Nuclei, Astronomical Models, Emission, Gamma Ray Astronomy, Gamma Rays, Monte Carlo Method, Scattering, Seyfert Galaxies, Spectra, X Ray Astronomy, X Rays, Computerized Simulation, Gamma Ray Observatory, Gamma Ray Telescopes, Mathematical Models, Power Series, Scintillation Counters
Scientific paper
We have developed a Monte Carlo code to compute the soft gamma-ray spectrum escaping from a simple active galactic nucleus's geometry. We assume a central source emitting a primary power law emission surrounded by matter which may be in the form of a torus and/or clouds. We derive a wide variety of spectral shapes resulting from different values of the basic parameters such as the column density, the power-law index, and the viewing angle. Comparisons with observations between 40 keV and 1 MeV show that the recent surprising results reported by the SIGMA and Oriented Scintillation Spectrometer Experiment (OSSE) experiments can be explained by pure scattering of the power-law spectrum on the matter, while the central source is not seen by the observer.
Jourdain Elisabeth
Roques Jean Pierre
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