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Cook’s Model and Linewidths of OH Masers

Published online by Cambridge University Press:  25 April 2016

Stephen White
Stephen White*
Affiliation:
Department of Theoretical Physics, University of Sydney, Sydney
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Extract

Two outstanding problems in the interpretation of OH masers are their narrow linewidths, and the rare occurrence of Zeeman pairs (Reid and Moran 1981). On discovery, the narrow but intense features of OH sources suggested unsaturated maser action (Perkins et al 1966). However the features are often so bright that saturation must be involved, and in saturated growth the features should rebroaden to about the thermal width (Goldreich and Kwan 1974). This is not observed (Reid and Moran 1981).

Type
Contributions
Information
Publications of the Astronomical Society of Australia , Volume 4 , Issue 2 , 1981 , pp. 235 - 237
Copyright
Copyright © Astronomical Society of Australia 1981

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References

Cook, A. H., Nature, 503 (1966).Google Scholar
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Goldreich, P., and Kwan, J. Y., Astrophys. J., 190, 27 (1974).Google Scholar
Perkins, F., Gold, T., and Salpeter, E. E., Astrophys. J., 145, 361 (1966).Google Scholar
Reid, M. J., Haschick, A. D., Burke, B. F., Moran, J. M., Johnston, K. J., and Swenson, G. W., Astrophys. J., 239, 89 (1980).Google Scholar
Reid, M. J., and Moran, J. M., Harvard Center for Astrophysics Preprint No. 1429 (1981). (Annu. Rev. Astron. Astrophys., 1981).Google Scholar
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