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The Role of Extragalactic Jets in the Magnetization of the Intergalactic Medium

Published online by Cambridge University Press:  19 July 2016

L.C. Jafelice  and
R. Opher
L.C. Jafelice
Affiliation:
∗ Faculdade de Ciências Matemáticas e Físicas da PUCSP R. Marques de Paranaguá, 111 - CEP 01303 - SP, Brazil + Instituto Astronômico e Geofísico da USP C. Postal 30.627 - CEP 01051 - SP, Brazil
R. Opher
Affiliation:
+ Instituto Astronômico e Geofísico da USP C. Postal 30.627 - CEP 01051 - SP, Brazil

Abstract

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We consider a current carrying extragalactic jet and the corresponding return current closing the circuit. The Lorentz force for the return path is expansive. Assuming that the expansion occurs at the local Alfvén velocity, we calculate numerically the radial distance from the jet axis which the return circuit reaches due to this electrodynamic expansion. The calculations are made explicity for parameter values observed for the sources Cygnus A, NGC 6251, 3C465 and M84. The results obtained can explain several magnetic features observed in these sources. The possible importance of previous generations of extragalactic jets in the large scale magnetization of the intergalactic medium is also discussed.

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. 497 - 498
Copyright
Copyright © Kluwer 1990 

References

Dreher, J.W., Carilli, C.L., and Perley, R.A. (1987) ‘The Faraday Rotation of CygnusA: Magnetic Fields in Cluster Gas’, Astrophys. J. 316, 611–625.CrossRefGoogle Scholar
Jafelice, L.C., Opher, R., Assis, A.S., and Busnardo–Neto, J. (1989) ‘Current Generation in Extragalactic Jets by Cherenkov Damping of MHD Waves’, submitted for publication.Google Scholar
Rees, M.J. (1987) ‘The Origin and Cosmogonic Implications of Seed Magnetic Fields’, Q. J1. R. astr. Soc. 28, 197–206.Google Scholar