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Title:
A suggested classification and explanation for hotspots in some powerful radio sources
Authors:
Kronberg, P. P.; Jones, T. W.
Affiliation:
AA(Scarborough College; David Dunlap Observatory, Toronto, Canada), AB(Minnesota, University, Minneapolis, MN)
Publication:
In: Extragalactic radio sources; Proceedings of the Symposium, Albuquerque, NM, August 3-7, 1981. (A82-47855 24-90) Dordrecht, D. Reidel Publishing Co., 1982, p. 157-159; Discussion, p. 159, 160. Natural Sciences and Engineering Research Council
Publication Date:
00/1982
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
ASTRONOMICAL MODELS, EXTRAGALACTIC RADIO SOURCES, RADIO EMISSION, ELECTRON ACCELERATION, INTERSTELLAR MAGNETIC FIELDS, KELVIN-HELMHOLTZ INSTABILITY, MAGNETICALLY TRAPPED PARTICLES, QUASARS, RADIO GALAXIES, RELATIVISTIC ELECTRON BEAMS
Comment:
A&AA ID. AAA031.141.135
Bibliographic Code:
1982IAUS...97..157K

Abstract

High resolution maps of the outer complexes of some 'well formed' powerful radio sources suggest that two physically distinct types of outer hotspots can be distinguished. Type A hotspots occur at the outer leading edge, and have a cusp-like, or otherwise elongated shape. Type B hotspots generally lie off the A hotspot-galaxy/QSO axis. They are more compact and have a higher minimum energy density than the outer, Type A hotspots. A description is presented of a suggested model for A and B hotspots. It is assumed that the A hotspots occur at the end of the beam which deposits the energy from the galaxy/QSO. The B hotspots arise from instabilities which form along or near the lobe-i.g.m. interface as the A hotspot advances into the ambient medium. The observed circumferential geometry of magnetic field lines in A hotspots provides a natural channel for rapid transport, backwards and off axis, of relativistic electrons from the A hotspot.

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