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Nuclei of Galaxies: The Origin of Plasma Beams

Published online by Cambridge University Press:  14 August 2015

Martin J. Rees
Martin J. Rees*
Affiliation:
Institute of Astronomy Cambridge, England

Extract

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The radio structures mapped by aperture-synthesis techniques with the VLA, and discussed earlier at this conference by Fomalont, are energised by activity in galactic nuclei. The compact radio sources resolvable by VLBI techniques (Pauliny-Toth, these proceedings) are on scales ~105 times smaller; but even this still far exceeds the scale where - according to most theoretical ideas - the primary power production is concentrated. This central “core” - involving a large concentrated mass, probably a black hole of ~ 108 M⊙ accreting material from its surroundings - is the primary origin of the power for all categories of activity associated with active galaxies and quasars. In this paper, I shall principally discuss how this “core” could give rise to the fast-moving plasma which emerges in directed beams and energises the radio sources; I shall also comment on some interesting features of radio source structure.

Type
Research Article
Information
Symposium - International Astronomical Union , Volume 94: Origin of Cosmic Rays , 1981 , pp. 139 - 164
Copyright
Copyright © Reidel 1981 

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