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3. Deviations from circular motion and the importance of southern hemisphere 21-cm. observations

Published online by Cambridge University Press:  14 August 2015

F. K. Edmondson
F. K. Edmondson*
Affiliation:
Goethe Link Observatory, Indiana University, Bloomington, Indiana, U.S.A.

Extract

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(1) The suggestion of systematic deviations from circular motion by an angle ϕ, constant throughout the Galaxy, was first presented (Edmondson, 1955) [1] as an ad hoc way to recompute distances so as to make the long circular arm discovered by the Leiden observers (van de Hulst, Muller and Oort, 1954) [2] spiral in. The logarithmic spiral motions postulated in this model are not necessarily along the spiral arms, in contrast to the assumption made by Mrs Rubin (1955) [3].

Type
Part I: Spectral Line Investigations
Information
Symposium - International Astronomical Union , Volume 4: Radio Astronomy , 1957 , pp. 19 - 21
Copyright
Copyright © Cambridge University Press 1957 

References

1. Edmondson, F. K. P.A.S.P. 67, 10–11, 1955.Google Scholar
2. van de Hulst, H. C., Muller, C. A. and Oort, J. H. B.A.N. 12, 136, no. 452, 1954.Google Scholar
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6. Edmondson, F. K. Sky and Telescope , 14, 321, 1955.Google Scholar
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