Abstract
DR. G. R. BURBIDGE has proposed1 that the energy source for intense radio emitters (largely giant elliptical galaxies) can most reasonably be expected to be derived from a temporarily greatly enhanced rate of supernova activity in a galaxy. He further proposed1 that this enhancement resulted from a collective stellar catastrophe in which older stars close to a condition of instability could participate in a chain reaction of Type 1 supernova explosions in which one explosion triggers that in a neighbour. As an alternative, it has been proposed2 that the enhancement resulted from collective stellar formation in which the more massive stars would evolve to the Type II supernova stage in a reasonably short period of time. In the latter proposal it was assumed that the energies associated with gas in an elliptical galaxy are small compared with the magnetic energy, and hence the magnetic field must control the contraction of the gas to form stars, and will prevent fragmentation until a late stage in which conservation of angular momentum has caused the formation of a disk.
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