Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982ap%26ss..84..225y&link_type=abstract
Astrophysics and Space Science, vol. 84, no. 1, May 1982, p. 225-242.
Astronomy and Astrophysics
Astrophysics
5
Beams (Radiation), Collimation, Energetic Particles, Extragalactic Radio Sources, Magnetohydrodynamic Waves, Elliptical Galaxies, Flow Equations, Galactic Nuclei, One Dimensional Flow
Scientific paper
A formation mechanism for radio galaxy collimated beams is presented whose flows are driven nonthermally, by high energy particles and MHD waves, and which may by constrast with thermally driven flows be found in low pressure regions. The mechanism requires that the MHD waves be confined within the wave zone around the galactic nucleus and collimated into the axis of symmetry of the nuclear disk. While quasi-radial accretion may be possible in elliptical galaxies, a spiral galaxy accretion flow will possess high angular momentum and may form the thin disk accretion. It follows from wave collimation that strong, durable radio sources are associated with elliptical galaxies. Accretion flows calculated with the magnetic field at the galactic center are also given.
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