Collective plasma processes in extragalactic radio sources

Details Collective plasma processes in extragalactic radio sources Collective plasma processes in extragalactic radio sources

Nov 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26a...225..341l&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 225, no. 2, Nov. 1989, p. 341-350.

Astronomy and Astrophysics

Astrophysics

25

Cosmic Plasma, Extragalactic Radio Sources, Plasma Turbulence, Electron Acceleration, Magnetohydrodynamics, Plasma Heating

Scientific paper

Collective plasma processes are suggested that can account for the energy dissipation in hot spots of extragalactic radio sources. On the basis of magnetohydrodynamic models for the origin and propagation of current carrying jets, it is shown that in the terminal shock in hot spots lower-hybrid turbulence is excited. This turbulence, driven by drifting electrons in the shock, provides the anomalous conductivity required for current closure. Lower-hybrid turbulence is also generated by ion reflection in the upstream plasma, where it is capable both of ion heating and electron acceleration. The model explains the ion postshock temperature required by the jump conditions and the electron preacceleration necessary for efficient diffusive acceleration.

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