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Detection of New Ammonia Sources

Published online by Cambridge University Press:  14 August 2015

G.H. Macdonald ,
A.T. Brown ,
L.T. Little ,
D.N. Matheson  and
M. Felli
G.H. Macdonald
Affiliation:
1Electronics Laboratory, University of Kent at Canterbury, U.K.
A.T. Brown
Affiliation:
1Electronics Laboratory, University of Kent at Canterbury, U.K.
L.T. Little
Affiliation:
2DERAD, Observatoire de Meudon, 92190 Meudon, France.
D.N. Matheson
Affiliation:
3SRC Appleton Laboratory, Chilbolton Observ., Stockbridge, U.K.
M. Felli
Affiliation:
4Osservatorio Astrofisico di Arcetri, 50125 Firenze, Italy.

Extract

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Ammonia is a favoured molecule for the study of molecular clouds since several important parameters of the cloud can be deduced from simple observations of the J,K=1,1 and 2,2 inversion doublet transitions and the hyperfine structure in the (1,1) line. With the additional knowledge of the kinetic temperature Tk from observations of CO, for example, it is possible to compute the excitation temperature of the (1,1) line (T11), the rotational temperature between the (1,1) and (2,2) levels (T21), the molecular hydrogen density n(H2) and ammonia column density N(NH3) (see, for example, Martin and Barrett, 1978).

Type
Research Article
Information
Symposium - International Astronomical Union , Volume 87: Interstellar Molecules , 1980 , pp. 83 - 84
Copyright
Copyright © Reidel 1980 

References

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