Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991pasp..103..874o&link_type=abstract
(Rice University and University of Texas, Texas-Mexico Conference on Astrophysics: Plasmas in Astrophysics, 3rd, Rice University
Astronomy and Astrophysics
Astrophysics
7
Active Galactic Nuclei, Astrophysics, Galactic Structure, Interacting Galaxies, Seyfert Galaxies, Accretion Disks, Black Holes (Astronomy), High Energy Interactions, Particle Energy, Photoionization, Photons
Scientific paper
Some aspects of recent results on the nature of active galactic nuclei are reviewed. The importance of photoionization by a hard spectrum containing high-energy photons, extending to the X-ray region, is emphasized. Time-variation studies plus spectral line ratios show that simple models cannot satisfy all the observational constraints, and some of the suggested more sophisticated models are briefly described. Observational and theoretical results which emphasize the importance of interactions between galaxies in refueling the accretion disks about massive black holes at their centers are reviewed.
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