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MHD Equilibrium and Instabilities in Extragalactic Jets

Published online by Cambridge University Press:  04 August 2017

Attilio Ferrari
Attilio Ferrari*
Affiliation:
Istituto di Fisica Generale, Universita' di Torino, Italy Harvard-Smithsonian Center for Astrophysics, Cambridge, USA

Abstract

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Morphologies, energetics and nonthermal radiation emission of extragalactic radio sources can be explained in the framework of models based on the physics of supersonic jets interacting with the surrounding intergalactic medium. In this review current physical interpretation of acceleration, collimation, modulation and nonthermal radiation of these jets are discussed. We begin with an analysis of the equilibrium configurations of collimated flows; the propagation outside the galactic nuclei is shown to be modulated by fluid, MHD and resistive instabilities, which, at the same time, support charged particle acceleration by turbulent stochastic processes, and consequently nonthermal radiation emission from the radio to the X-ray range. Large scale morphologies (knots, wiggles and bendings) are considered from the point of view of their interpretation as global perturbations of the flow produced by fluid instabilities.

Type
Session VI
Information
Symposium - International Astronomical Union , Volume 107: Unstable Current Systems and Plasma Instabilities , 1985 , pp. 393 - 412
Copyright
Copyright © Reidel 1985 

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