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1. Studies of the 21-cm. line and their interpretation

Published online by Cambridge University Press:  14 August 2015

H. C. van de Hulst
H. C. van de Hulst*
Affiliation:
University Observatory, Leiden, Netherlands

Extract

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The subject of the 21-cm. line needs no introduction to this audience. Perhaps as an introduction I may mention one moment that belongs to the pre-history of the investigations of this line. In the spring of 1944 Oort said to me: ‘We should have a colloquium on the paper by Reber; would you like to study it? And, by the way, radio astronomy can really become very important if there were at least one line in the radio spectrum. Then we can use the method of differential galactic rotation as we do in optical astronomy.’

Type
Part I: Spectral Line Investigations
Information
Symposium - International Astronomical Union , Volume 4: Radio Astronomy , 1957 , pp. 3 - 13
Copyright
Copyright © Cambridge University Press 1957 

References

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