Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994ap%26ss.217..233b&link_type=abstract
Astrophysics and Space Science (ISSN 0004-640X), vol. 217, no. 1-2, p. 233-236
Astronomy and Astrophysics
Astrophysics
Accretion Disks, Active Galactic Nuclei, Black Holes (Astronomy), Galactic Radiation, Infrared Imagery, Near Infrared Radiation, Quasars, Seyfert Galaxies, Astronomical Photometry, Astrophysics, Infrared Astronomy, Sky Surveys (Astronomy), Spectral Energy Distribution, Stellar Color, Stellar Luminosity
Scientific paper
It is generally believed that strongly active galaxies such as Quasars and Seyferts are powered by a central black-hole surrounded by an accretion disc giving rise to energy output far above that expected from stellar processes. These are the objects I shall call AGN (Active Galactic Nuclei). AGN are also not a homogeneous class of objects and the nomenclature is somewhat complicated in order to account for the wide range of observed properties (changing appearance depending on external factors such as viewing angle, presence of dust, luminosity of the surrounding galaxy etc...).
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