Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...404..551o&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 404, no. 2, p. 551-562.
Astronomy and Astrophysics
Astronomy
103
Active Galactic Nuclei, Galactic Evolution, Galactic Structure, Black Holes (Astronomy), Interacting Galaxies, Radio Galaxies, Seyfert Galaxies
Scientific paper
A review of the current level of understanding of AGN is presented, with emphasis on the observational results, the diagnostic information, and the interpretations relatively close to them. The best current working hypothesis is that the central source includes an accretion disk centered on a massive black hole, but the disk is more complicated than a simple alpha-model thin disk. Much of the energy input to the surrounding gas is by photoionization from a hard spectrum, extending well into the X-ray region, emitted by the central source, probably by the combination of several different processes, but which result in, to a first approximation, a power law, to a second approximation, a broken power law, and to a higher approximation, many more complications in detail. AGN 'form', or are activated, when a preexisting inactive black hole in a 'normal' galaxy is refueled by gas as a result of an interaction, either a perturbation or merger, with another galaxy.
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