Radio emission from supernova remnants in a cloudy interstellar medium

Details Radio emission from supernova remnants in a cloudy interstellar medium Radio emission from supernova remnants in a cloudy interstellar medium

Sep 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...260..625b&link_type=abstract

Astrophysical Journal, Part 1, vol. 260, Sept. 15, 1982, p. 625-634. Research supported by the Alfred P. Sloan Foundation

Astronomy and Astrophysics

Astrophysics

76

Extragalactic Radio Sources, Gamma Rays, Interstellar Matter, Stellar Models, Supernova Remnants, Hydrogen, Interstellar Gas, Interstellar Magnetic Fields, Nonthermal Radiation, Particle Acceleration, Shock Fronts, Synchrotron Radiation, X Rays

Scientific paper

The van der Laan (1962) theory of SNR radio emission is modified in light of the inhomogeneity of the interstellar medium, and in order to allow for particle acceleration in shock fronts. It is proposed that most of the radio emission in 10-20 pc radius SNRs originates in cold interstellar clouds that have been crushed by the high pressure hot gas within the expanding remnant. Under these circumstances, simple reacceleration of ambient interstellar cosmic ray electrons can account for the surface brightness-diameter distribution of observed remnants, with the additional, relativistic particle energy compensating for the decreased filling factor of the radio-emitting regions. Warm interstellar gas, at about 8000 K, may also be compressed within very large SNRs (of radius of 30-100 pc) and account for both the giant radio loops, when these SNRs are seen individually, and the anomalously bright galactic nonthermal radio background, which may be the superposition of a number of such features.

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