Computer Science – Numerical Analysis
Scientific paper
Jun 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...428..599g&link_type=abstract
The Astrophysical Journal, vol. 428, no. 2, pt. 1, p. 599-608
Computer Science
Numerical Analysis
1
Active Galactic Nuclei, Astronomical Models, Deposition, Electron-Positron Pairs, Nonthermal Radiation, Reflection, Time Dependence, X Ray Spectra, Comparison, Computerized Simulation, Exosat Satellite, Ginga Satellite, Hardness, Numerical Analysis
Scientific paper
Standard nonthermal electron-positron pair cascades, including the effects of reflection from an accretion disk, can explain reasonably well the mean spectra of low-luminosity, Seyfert-type active galaxies. We test this model using the spectral variability observed by EXOSAT between 0.05 and 10 keV in five active galaxies: NGC 5548, 3C 120, 3C 273, NGC 7469, and MCG 2-58-22. We find that pair-reflection models fail to reproduce the full range of spectra observed, particularly very hard spectra with a strong soft X-ray excess. Either the pair-reflection model is not an accurate description of the emission process in these objects or extrinsic effects, such as enhancement of the reflection component and/or a partially ionized absorber with a large column density, are responsible for much of the observed spectral variability.
Done Christine
Grandi Paola
Urry Claudia Megan
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