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21. The low-frequency spectrum of Cygnus A and Cassiopeia A

Published online by Cambridge University Press:  14 August 2015

R. J. Lamden  and
A. C. B. Lovell
R. J. Lamden
Affiliation:
Jodrell Bank Experimental Station, University of Manchester, England
A. C. B. Lovell
Affiliation:
Jodrell Bank Experimental Station, University of Manchester, England

Extract

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The published measurements of the intensity of the radio sources cover a frequency range down to a lower limit of 22·6 Mc./s., at which measurements have been made on Cygnus and Cassiopeia by Hey and Hughes (1954)[1]. Information about the spectrum at still lower frequencies is difficult to obtain because of interference arising from ionospheric reflexion of distant radio transmitters. Some of this trouble can be alleviated by using a narrow pencil-beam radio telescope for reception and the present communication describes measurements made on frequencies of 16·5, 19·0, 22·6 and 30·0 Mc./s. using the 218 ft. transit radio telescope at Jodrell Bank.

Type
Part II: Point Sources: Individual Study and Physical Theory
Information
Symposium - International Astronomical Union , Volume 4: Radio Astronomy , 1957 , pp. 145 - 147
Copyright
Copyright © Cambridge University Press 1957 

References

1. Hey, J. S. and Hughes, V. A. Nature , 173, 819, 1954.Google Scholar
2. Adgie, R. Unpublished symposium communication.Google Scholar