Abstract
We assemble the radio data for the compact radio sources in the starburst galaxy M82 and compare their properties with the six known radio supernovae. The comparison supports the interpretation of the sources in M82 as old radio supernovae or very young supernova remnants. The spectral index distribution appears to show a bimodal structure, with the spectral index either being close to ∼−0.5 or close to ∼−1. None of the available theories to explain radio emission has been worked out sufficiently to let us understand this spectral behaviour.
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