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

  • H. C. van de Hulst (a1)

Extract

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.’

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References

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1. van de Hulst, H. C., Muller, C. A. and Oort, J. H. B.A.N. 12, 117, no. 452, 1954.
2. Purcell, E. M. and Field, G. B. Ap. J. 124, 542, 1956.
3. Spitzer, L. and Savedoff, M. P. Ap. J. 111, 593, 1950.
4. Kahn, F. D. Gas Dynamics of Cosmic Clouds (van de Hulst, H. C. and Burgers, J. M., editors). North-Holland Publ. Co., p. 60, 1955.
5. Kwee, K. K., Muller, C. A. and Westerhout, G. B.A.N. 12, 211, no. 458, 1954.
6. Edmondson, F. K. P.A.S.P. 67, 10, 1955; A.J. 60, 160, 1955; also this publication papers 2 and 3.
7. Rubin, Vera C. A.J. 60, 177, 1955.
8. Heifer, H. L. and Tatel, H. E. Ap. J. 121, 585, 1955.
9. Kerr, F. J., Hindman, J. V. and Robinson, B. J. Aust. J. Phys. 7, 297, 1954.
10. Schwarzschild, M. A.J. 59, 273, 1954.
11. Stone, S. N. P.A.S.P. 67, 185, 1955.

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

  • H. C. van de Hulst (a1)

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