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

  • F. K. Edmondson (a1)

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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].

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References

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1. Edmondson, F. K. P.A.S.P. 67, 1011, 1955.
2. van de Hulst, H. C., Muller, C. A. and Oort, J. H. B.A.N. 12, 136, no. 452, 1954.
3. Rubin, V. C. A.J. 60, 177, 1955.
4. Oort, J. H. Ap. J. 116, 237, Table 1, 1952.
5. Edmondson, F. K. A.J. 60, 160, 1955.
6. Edmondson, F. K. Sky and Telescope , 14, 321, 1955.
7. McClain, E. F. This symposium, p. 80, 1957.
8. Kwee, K. K., Muller, C. A. and Westerhout, G. B.A.N. 12, 214, no. 458, 1954.
9. McClain, E. F. Private communication, 1955.
10. Carpenter, M. S. This symposium, p. 18, 1957.

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

  • F. K. Edmondson (a1)

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