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The Production of Rotation Measure Gradients in the Lobes of Extragalactic Radio Sources

Published online by Cambridge University Press:  19 July 2016

G.V. Bicknell ,
R.A. Cameron  and
R.A. Gingold
G.V. Bicknell
Affiliation:
Mount Stromlo and Siding Spring Observatories Institute of Advanced Studies, Australian National University
R.A. Cameron
Affiliation:
Mount Stromlo and Siding Spring Observatories Institute of Advanced Studies, Australian National University
R.A. Gingold
Affiliation:
Australian National University Supercomputer Facility

Abstract

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It is proposed that the large rotation measure gradients observed in the lobes of some extragalactic radio sources are produced by non–linear Kelvin–Helmholtz surface waves. Related small scale turbulence is responsible for a “diffuse spray” of relativistic plasma and magnetic field into the surrounding medium. The mixture of magnetic field and thermal plasma causes large rotation measure variations on the scale of the Kelvin–Helmholtz waves. An order of magnitude prediction of the effect is in good agreement with the observations of Cygnus A and PKS 2104–25 N.

Type
9. Magnetic Fields in the Galactic Environment, Galaxy Clusters and Intergalactic Medium
Information
Symposium - International Astronomical Union , Volume 140: Galactic and Intergalactic Magnetic Fields , 1990 , pp. 477 - 481
Copyright
Copyright © Kluwer 1990 

References

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