Does the galactic synchrotron radio background originate in old supernova remnants

Details Does the galactic synchrotron radio background originate in old supernova remnants Does the galactic synchrotron radio background originate in old supernova remnants

Apr 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982mnras.199...97s&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 199, Apr. 1982, p. 97-108.

Astronomy and Astrophysics

Astronomy

9

Background Radiation, Cosmic Rays, Galactic Radio Waves, Supernova Remnants, Synchrotron Radiation, Electron Energy, Gamma Ray Astronomy, Interstellar Magnetic Fields, Radiative Transfer

Scientific paper

Observations of the galactic synchrotron radio background indicate that the emission arises in localized regions of high emissivity. Various lines of evidence suggest that these are the radiative shells of old supernova remnants in which the synchrotron emissivity is enhanced due to compression of the interstellar magnetic field along with the correlated increase in the energy density of cosmic ray electrons. This possibility is consistent with recent observations of the interstellar medium that imply the presence of a large amount of hot, low density gas in the galaxy. In such a medium supernova remnants would expand to large radii before becoming radiative. The intensity of the background can then be understood without needing to evoke higher magnetic fields or cosmic ray electron fluxes than are obtained from other observations. In this picture, the fluctuating component of the galactic magnetic field arises from the distortion of the regular field by the shells. Other explanations for the origin of the background are briefly discussed. This result casts doubt on the existence of large-scale cosmic ray gradients inferred from galactic gamma ray observations.

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