The origin of flat radio spectra in shell-type supernova remnants

Details The origin of flat radio spectra in shell-type supernova remnants The origin of flat radio spectra in shell-type supernova remnants

Jul 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26a...219..192s&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 219, no. 1-2, July 1989, p. 192-194.

Astronomy and Astrophysics

Astrophysics

15

Radio Spectra, Shell Stars, Stellar Spectra, Supernova Remnants, Cosmic Plasma, Diffuse Radiation, Particle Acceleration, Shock Waves, Synchrotron Radiation

Scientific paper

The occurrence of shell-type supernova remnants with a flat synchrotron radio spectrum is explained by diffusive particle acceleration at an adiabatic parallel shock wave in a low beta-plasma (beta is approximately equal to 0.05). The observed dispersion in spectral index values below alpha = 0.5 is attributed to a distribution of low beta-values in different remnants, whereas the dispersion in large spectral indices (alpha greater than 0.5) results from a distribution of compression ratios in different remnants.

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