Abstract
The authors attempt to show that the results of Heeschen on extra-galactic radio sources can be simply interpreted in terms of a consistent evolutionary sequence. They suggest that only three stages of evolution are required: particle injection into a jet-like structure; adiabatic expansion of a relativistic gas; and, finally, pressure equilibrium with the inter-galactic gas. This suggests that the quasars are at cosmological distances.
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References
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SIMON, M., DRAKE, F. An Evolutionary Sequence for Strong Radio Sources. Nature 215, 1457–1459 (1967). https://doi.org/10.1038/2151457a0
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DOI: https://doi.org/10.1038/2151457a0
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