Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978phys...17..293c&link_type=abstract
(Niels Bohr Institut, Teknisk Videnskabelige Forskningsrad, and Nordisk Institut for Teoretisk Atomfysik, Symposium on Quasars a
Astronomy and Astrophysics
Astrophysics
12
Astronomical Models, Galactic Nuclei, Quasars, Seyfert Galaxies, Astrophysics, Emission Spectra, Energy Transfer, Forbidden Bands, Line Spectra, Optical Thickness, Photoionization, Radiative Transfer, Thermodynamic Equilibrium, Ultraviolet Radiation
Scientific paper
Models for the region emitting the forbidden and the permitted lines of Quasars and Seyfert nuclei are reviewed. First, the mode of energy supply is discussed, and it is concluded that, while the supply is predominantly radiative in the region emitting the forbidden lines, as generally assumed, it is probably partly kinetic in the region emitting the permitted lines. The models include stationary photoionized models, where the thermal equilibrium and the transfer are solved, models in which the transfer and the thermal equilibrium are not taken into account, and time dependent photoionized models. A brief discussion of the other kinds of possible models is given.
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