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Radio Observations of the Gum Nebula below 20 MHz

Published online by Cambridge University Press:  25 April 2016

G. R. A. Ellis
G. R. A. Ellis*
Affiliation:
Department of Physics, University of Tasmania
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Extract

Low frequency radio waves propagating in the interstellar medium are attenuated through absorption by thermal electrons, the optical depth being given by

where f is the radio frequency in MHz, the emission measure in cm-6 pc, and Te the electron temperature.

Type
Contributions
Information
Publications of the Astronomical Society of Australia , Volume 2 , Issue 3 , October 1972 , pp. 158 - 159
Copyright
Copyright © Astronomical Society of Australia 1972

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References

1 Alexander, J. K., The Gum Nebula and related problems. Goddard Space Flight Center Report X603-71-375, p. 34 (1971).Google Scholar
2 Ellis, G. R. A. and Hamilton, P. A., Ap. J. 143, 227 (1966).Google Scholar
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4 Landecker, T. L. and Wielebinski, R., Aust. J. Phys. Astrophys. Suppl. No. 16, (1970).Google Scholar
5 Hamilton, P. A., Ph.D. thesis. University of Tasmania (1969).Google Scholar
6 Spitzer, L., Stars and Stellar Systems, Editors Middlehurst, B. M. and Aller, L. H. 7, 1 (1968).Google Scholar