Red-Shift Absorption Spectrum of the Cygnus-A Radio Source

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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

  1. 1

    Lilley, A. E., and McClain, E. F., Astrophys. J., 123, 172 (1956).

  2. 2

    Baade, W., and Minkowski, R., Astrophys. J., 119, 206 (1954).

  3. 3

    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) doi:10.1038/184803b0

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