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Neutral hydrogen in the central part of the galactic system

Published online by Cambridge University Press:  14 August 2015

G. W. Rougoor  and
J. H. Oort
G. W. Rougoor
Affiliation:
Leiden Observatory, The Netherlands
J. H. Oort
Affiliation:
Leiden Observatory, The Netherlands

Extract

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While trying to determine the rotation curve in 1953 Kwee, Muller, and Westerhout [1] found long and faint wings in the line profiles within 20 to 25 degrees longitude from the center. The gas responsible for these wings should therefore lie within 3 kiloparsecs from the center. The velocities of the neutral hydrogen causing these wings are far greater than could be expected on the basis of a reasonable rotational model of the Galaxy. Therefore, the wings were tentatively interpreted as being caused by high turbulent velocities in the gas. In view of the new and better data obtained with the 25-meter telescope in Dwingeloo, this interpretation has now been dropped. The new conclusion is that all of the neutral hydrogen in these regions is expanding and at the same time taking part in the galactic rotation. The evidence for this conclusion will be briefly presented.

Type
Part IV: The Large-Scale Structure of Galaxies
Information
Symposium - International Astronomical Union , Volume 9: Paris Symposium on Radio Astronomy , 1959 , pp. 416 - 422
Copyright
Copyright © Stanford University Press 1959 

References

1. Kwee, K. K., Muller, C. A., and Westerhout, G. B.A.N. 12, 211, 1954.Google Scholar
2. van Woerden, H., Rougoor, W., and Oort, J. C.R. 244, 1691, 1957.Google Scholar
3. Kerr, F. J. Private communication.Google Scholar
4. Schmidt, M. Article to be published in the Ap. J. Google Scholar