Computer Science
Scientific paper
May 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aipc..410.1308c&link_type=abstract
The fourth compton symposium. AIP Conference Proceedings, Volume 410, pp. 1308-1312 (1997).
Computer Science
Active And Peculiar Galaxies And Related Systems, Magnitudes And Colors, Luminosities, Infall, Accretion, And Accretion Disks
Scientific paper
We have developed a Monte Carlo code in order to compute the emergent X-ray and γ-ray spectra for different geometries and orientations of Seyfert galaxies. Our calculation includes reflection off a cold, optically thick accretion disk, obscuration and reflection by a neutral torus, and reprocessing of the radiation by an ionized cone of material located within the opening angle of the torus. We assume a standard spectral form for the central X-γ continuum emission, and we attempt to fit the broad band spectra of Seyfert galaxies NGC 4945, NGC 4151 and IC 4329A using data obtained by the Ginga, ROSAT, ASCA and OSSE instruments. These three objects span the range of Seyfert classifications, and by fitting their spectra we infer the torus geometries surrounding their central X-γ sources. In particular, we find that the strength of the reflection hump can be a useful diagnostic for constraining the covering factor of the disk-torus system as seen by the central continuum source.
Chiang James
Dermer Carles D.
Skibo Jeffery G.
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