Abstract
A MEASUREMENT to check the 21-cm. hydrogen line absorption spectrum of Cygnus-A (19N4A) reported by Lilley and McClain1 is important in view of the cosmological significance of their result. The absorption was observed by these authors within a 3 Mc./s. band centred on 1341 Mc./s. and was considered to be due to absorption in a neutral hydrogen cloud associated with the Cygnus-A source and receding with it at the optically determined2 velocity of 16,800 km./sec.
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References
Lilley, A. E., and McClain, E. F., Astrophys. J., 123, 172 (1956).
Baade, W., and Minkowski, R., Astrophys. J., 119, 206 (1954).
Muller, C. A., Paris Symposium on Radio Astronomy, edit. Bracewell, R. N. (Stanford University Press, 1959).
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DAVIES, R., JENNISON, R. Red-Shift Absorption Spectrum of the Cygnus-A Radio Source. Nature 184, 803–804 (1959). https://doi.org/10.1038/184803b0
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DOI: https://doi.org/10.1038/184803b0
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