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Radio Emission from Supernova Remnants

Published online by Cambridge University Press:  12 April 2016

Richard G. Strom
Richard G. Strom*
Affiliation:
Netherlands Foundation for Research in Astronomy, Radiosterrenwacht, Dwingeloo, The Netherlands

Extract

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Most of the supernova remnants known in the Galaxy have only been detected at radio frequencies. The reason for this is absorption in the Galactic plane at both optical and X-ray wavelengths. All available evidence suggests that the shock fronts which accompany supernova remnants accelerate enough cosmic rays to GeV energies to produce readily detectable radio emission. This is fortunate, for it enables us to study remnants throughout the Galactic disk, although existing catalogues may be anywhere from 50 to 90 % incomplete. Cosmic rays and the magnetic fields in which they gyrate are the essential ingredients for producing the synchrotron radiation which is observed at radio frequencies. Various methods for estimating magnetic field strengths can be applied to a small number of remnants, and produce values not far from those based upon equipartition between the energy contents of particles and fields. From this, the particle energy content is derived for a number of objects.

Type
Supernova Remnants
Information
International Astronomical Union Colloquium , Volume 145: Supernovae and Supernova Remnants , 1996 , pp. 333 - 340
Copyright
Copyright © Cambridge University Press 1996

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