Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992xrea.conf...22f&link_type=abstract
In MPI für Extraterrestrische Physik, X Ray Emission from Active Galactic Nuclei and the Cosmic X Ray Background p 22-35 (SEE N9
Astronomy and Astrophysics
Astronomy
6
Active Galactic Nuclei, Stellar Models, X Ray Astronomy, X Ray Spectra, Accretion Disks, Black Holes (Astronomy), Constraints, Emission Spectra, Luminosity, Variability
Scientific paper
The observational constraints placed on the structure and mechanism of the central engine in AGN (Active Galactic Nuclei) are discussed. Particular attention is paid to the results obtained from the X-ray spectra and variability, since they probably originate from innermost regions. Many objects have an efficiency higher than that of nuclear fusion. Together with the lack of soft X-ray absorption in many sources, stellar processes such as massive stars and supernovae can be ruled out. The most plausible model is the accreting black hole. However, definitive evidence for the model is lacking.
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