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Active galactic nuclei

REVIEW ARTICLE

D E Osterbrock

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Our current knowledge of active galactic nuclei is reviewed. The importance of observational data taken over a wide range of frequencies, from radio and infrared through optical and ultraviolet to X-rays and gamma -rays, is emphasized. Important overall principles include the continuity from quasars and QSOs through Seyfert and radiogalaxies to low-luminosity LINERs, the importance of considering roughly cylindrically symmetric (rather than spherically symmetric) structures, and that the various regions generally have different axes and planes of symmetry, and are often warped.


PACS

98.62.Js Galactic nuclei (including black holes), circumnuclear matter, and bulges

98.54.Gr Radio galaxies

98.54.Aj Quasars

95.30.Ky Atomic and molecular data, spectra, and spectral parameters (opacities, rotation constants, line identification, oscillator strengths, gf values, transition probabilities, etc.)

98.54.Cm Active and peculiar galaxies and related systems (including BL Lacertae objects, blazars, Seyfert galaxies, Markarian galaxies, and active galactic nuclei)

Subjects

Atomic and molecular physics

Astrophysics and astroparticles

Dates

Issue 4 (April 1991)



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