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Title:
Turbulence-related morphology in extragalactic radio sources
Authors:
Benford, G.; Ferrari, A.; Trussoni, E.
Affiliation:
AA(California, University, Irvine, Calif.), AB(CNR, Laboratorio di Cosmo-geofisica, Turin, Italy), AC(CNR, Laboratorio di Cosmo-geofisica, Turin, Italy)
Publication:
Astrophysical Journal, Part 1, vol. 241, Oct. 1, 1980, p. 98-110. (ApJ Homepage)
Publication Date:
10/1980
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
Extragalactic Radio Sources, Magnetohydrodynamic Turbulence, Particle Beams, Shear Flow, Crossed Fields, Intergalactic Media, Luminous Intensity, Magnetic Effects
DOI:
10.1086/158321
Bibliographic Code:
1980ApJ...241...98B

Abstract

As particle beams propagate through the intergalactic medium, unavoidable instabilities from shear flows produce turbulent magnetic waves. Rather than disrupting beams, this wave energy may enhance luminosity and alter morphology. For reasonable parameters the dominant nonlinear process is an energy cascade from long wavelengths (less than 10 to the 21st cm) to short wavelengths (not greater than 10 to the 14th cm), where particles are reaccelerated in quasi-linear fashion. A phenomenological turbulence theory is constructed to describe this. In an ambient magnetic field, wave-particle scatterings which cause reacceleration can also lead to spatial cross-field diffusion, broadening the beam. Thus beams can flare rapidly as they propagate. This relates luminosity to morphology in a new way. The broadening is wholly intrinsic, unrelated to the beam environment.

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