Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989esasp.296.1073w&link_type=abstract
In ESA, The 23rd ESLAB Symposium on Two Topics in X Ray Astronomy. Volume 2: AGN and the X Ray Background p 1073-1076 (SEE N90-2
Astronomy and Astrophysics
Astronomy
Active Galactic Nuclei, Astronomical Models, Mass Distribution, Spectral Line Width, X Ray Spectra, Gas Ionization, Photoionization, Spectral Signatures, Spectrum Analysis
Scientific paper
The hard X-ray spectrum of Active Galactic Nuclei (AGN) is described with a powerlaw and a low energy cold absorption. Additional soft X-ray photons are also observed in the spectra. It is shown that a separate soft X-ray component cannot compensate the absorption by a very large column density cloud completely covering the hard X-ray powerlaw. The maximum column density is less than 10 to the 23rd power/sq cm for a large class of soft component models if the hard X-ray source is totally covered. This implies a non spherical geometry for the broad line region or a complicated model to describe the X-ray spectra of AGN with at least two emission components partially covered by a large column density absorber.
Courvoisier Thierry J. -L.
Walter Robert
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