Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...178..252o&link_type=abstract
Astronomy and Astrophysics, Vol. 178, No. 1/2, p. 252 - 256
Astronomy and Astrophysics
Astrophysics
Spiral Galaxies:Particle Acceleration, Spiral Galaxies:Synchrotron Radiation, Supernova Remnants:Particle Acceleration, Supernova Remnants:Synchrotron Radiation, Synchrotron Radiation:Spiral Galaxies, Synchrotron Radiation:Supernova Remnants
Scientific paper
The observed radio spectral indices of shell-type supernova remnants (SNRs) have a dispersion of about 30% around a mean value of about 0.5. Bright spiral galaxies (BSGs) have a mean value of about 0.74 and a dispersion of about 30%. In both cases the indices seem to be independent of dynamical evolutionary effects. The difference in the mean values (0.74-0.5 = 0.24) is understandable in terms of propagation effects in the BSGs on relativistic electrons after they leave their sources (likely SNRs). The dispersion, and idependence from evolutionary effects of the indices in both cases, are accounted for here in a systematic manner by including both first-order and second-order Fermi acceleration simultaneously.
Lerche Ian
Öge Dr W.
Schlickeiser Reinhard
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