Hot-spots in extragalactic radio sources - Shocks and the distribution of energy

Details Hot-spots in extragalactic radio sources - Shocks and the distribution of energy Hot-spots in extragalactic radio sources - Shocks and the distribution of energy

Jul 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981mnras.196..339h&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 196, July 1981, p. 339-351.

Astronomy and Astrophysics

Astronomy

7

Energy Distribution, Extragalactic Radio Sources, Magnetohydrodynamic Stability, Particle Beams, Shock Wave Propagation, Collisionless Plasmas, Energy Transfer, Mach Number, Plasma Control, Relativistic Particles

Scientific paper

Hot spots in extragalactic sources are analyzed using a model in which both particle and magnetic field energy are derived from macroscopic motions. An argument is made for the existence of waves throughout a radio-source head, generated not by boundary instability, but by the breaking of the beam shock. The concept of central energy input was shown to have advantages over existing theories. If the beam rotates, the waves carry net helicity and may generate the observed mean magnetic field. The energy density of the fast particles, the wave energy-density and mean field energy-density are intimately related and adjust to values compatible with the bulk-flow energy of the beam. The attainment of threshold energy prior to Fermi acceleration was found to occur in a distribution of low-Mach-number shocks, although some initial acceleration may occur by the dissipation of currents, probably resulting in efficient electron heating. Further studies of the stability of high-Mach-number relativistic shocks is suggested.

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