Relativistic jets and beams in radio galaxies

Astronomy and Astrophysics – Astronomy

Scientific paper

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151

Beams (Radiation), Cosmic Plasma, Galactic Nuclei, Plasma Jets, Radio Galaxies, Relativistic Plasmas, Relativistic Velocity, Black Holes (Astronomy), Collimation, Nuclear Reactions, Radio Sources (Astronomy)

Scientific paper

Observations are discussed which seem to indicate that the beams which continuously supply power to the components of extended double radio sources are collimated on a scale little larger than the primary power supply in the central galactic nucleus (i.e., much less than 1 pc) and that the beam orientation remains fairly steady over the whole lifetime. It is argued that collimation occurs close to a central collapsed object, that the beams are oriented along this object's spin axis, and that strong-field gravitational effects stabilize the beams against jitter even if the gas fuelling the source has an inconstant flow pattern. The suggestion is made that radio galaxies in which the beam axis seems to have gradually drifted or swung, rather than pointing in a constant direction may belong to a special class of sources that have experienced collisions and recurrent nuclear activity.

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