Active Galactic Nuclei

Details Active Galactic Nuclei Active Galactic Nuclei

Mar 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984qjras..25....1o&link_type=abstract

Quarterly Journal of the Royal Astronomical Society, Vol. 25, NO.1, P. 1, 1984

Astronomy and Astrophysics

Astronomy

74

Scientific paper

Observational evidence of the structure of active galactic nuclei, and the physical conditions in them, is reviewed, with particular emphasis on optical data. The importance of photoionization by high-energy photons is stressed. Dust seems to play a considerable role. X-ray measurements have added greatly to our knowledge of these objects. There are several indications of a tipped, cylindrically symmetric, disc-like structure rather than a spherically symmetric structure. The velocity field is an important constraint that must be predicted by any complete, physical model.

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