Abstract
G. R. BURBIDGE has recently reviewed the problem of the energy sources required to give the non-thermal radio emission from intense extragalactic sources1. The intrinsically strongest sources appear to be mostly associated with giant elliptical galaxies, and to be radiating at power-levels up to 107 times that of our own Galaxy. Burbidge argues convincingly that the high-energy particles responsible for the radio emission must be accelerated in supernova explosions. A typical strong radio source would require the explosion of 107 or 108 supernovæ in a period of 107 or 108 years. This is a considerably greater supernova-rate than normally occurs in a galaxy.
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References
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CAMERON, A. Star Formation in Elliptical Galaxies and Intense Radio Sources. Nature 194, 963–964 (1962). https://doi.org/10.1038/194963a0
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DOI: https://doi.org/10.1038/194963a0
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