Hostname: page-component-586b7cd67f-t7fkt Total loading time: 0 Render date: 2024-11-26T08:47:45.775Z Has data issue: false hasContentIssue false
  • English
  • Français

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
Get access Rights & Permissions [Opens in a new window]

Extract

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

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

Fukui, Y., Iguchi, T., Kaifu, N., Chikada, Y., Morimoto, M., Nagane, K., Miyazawa, K., and Miyaji, T., Pubi. Astron. Soc. Japan (1977) (in press).Google Scholar
Gardner, F. F., and Whiteoak, J. B., Astrophys. Lett., 5, 161 (1970).Google Scholar
Pauls, T., Downes, D., Mezger, P. G., and Churchwell, E. A., Astron. Astrophys., 46, 407 (1976).Google Scholar
Pauls, T., Mezger, P. G., and Churchwell, E., Astron. Astrophys., 34, 327 (1974).Google Scholar
Caswell, J. L., Batchelor, R. A., Goss, W. M., Haynes, R. F., Knowles, S. H., Wellington, K. J., Yabsley, D. E., and Balister, M., Proc. Astron. Soc. Aust., 3, 61 (1976).Google Scholar
Cheung, A. C., Rank, D. M., Townes, C. H., Thornton, D. D., and Welch, W. J., Phys. Rev. Lett., 21, 1701 (1968).CrossRefGoogle Scholar
Cheung, A. C., Chui, M. F., Matsakis, D., Townes, C. H., and Yngvesson, K. S., Astrophys. J. Lett., 186, L73 (1973).Google Scholar
Gardner, F. F., and Whiteoak, J. B., Nature, 247, 526 (1974).Google Scholar
Gardner, F. F., and Whiteoak, J. B., Mon. Not. R. Astron. Soc, 173, 77P(1975).Google Scholar
Gillespie, A. R., Huggins, P. J., Sollner, G., Phillips, T. G., Gardner, F. F., and Knowles, S. H., Mon. Not. R. Astron. Soc, (1977) (in press).Google Scholar
Kaifu, N., Morris, M., Palmer, P., and Zuckerman, B., Astrophys. J., 201, 98 (1975).Google Scholar
Mayer, C. H., Waak, J. A., Cheung, A. C., and Chui, M. F., Astrophys. J. Lett., 186, L73 (1973).Google Scholar
Morris, M., Zuckerman, B., Palmer, P., and Turner, B. E., Astrophys. J., 186, 501 (1973).Google Scholar
Morris, M., Zuckerman, B., Turner, B. E., and Palmer, P., Astrophys. J.Lett., 192, L27 (1974).Google Scholar
Whiteoak, J. B., and Gardner, F. F., Astron. Astrophys., 37, 389 (1974).Google Scholar
Whiteoak, J. B., and Gardner, F. F., Mon. Not. R. Astron. Soc, 176, 25P (1976).Google Scholar
Yabsley, D. E., Proc Astron. Soc. Aust., 3, 113 (1977).Google Scholar