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Observations of NH3 in Southern Sources

Published online by Cambridge University Press:  25 April 2016

R. A. Batchelor ,
F. F. Gardner ,
S. H. Knowles  and
U. Mebold
R. A. Batchelor
Affiliation:
Division of Radiophysics, CSIRO, Sydney
F. F. Gardner
Affiliation:
Division of Radiophysics, CSIRO, Sydney
S. H. Knowles
Affiliation:
Division of Radiophysics, CSIRO, Sydney
U. Mebold
Affiliation:
Division of Radiophysics, CSIRO, Sydney
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Ammonia was the first interstellar molecule with more than two atoms to be discovered (Cheung et al. 1968). Since that time it has been observed in many HII regions and dark clouds (Mayer et al. 1973; Morris et al. 1973; Cheung et al. 1973; Kaifu et al. 1975). The molecule has a rich rotation-inversion spectrum with about 10 transitions in the range 23-25 GHz. Each line has hyperfine structure which permits, in principle, the determination of optical depths, filling factors and excitation. Unfortunately line brightness temperatures are low (<1 K) so that a low-noise receiving system and long integration times are required to exploit these possibilities.

Type
Contributions
Information
Publications of the Astronomical Society of Australia , Volume 3 , Issue 2 , September 1977 , pp. 152 - 154
Copyright
Copyright © Astronomical Society of Australia 1977

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References

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