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Cyanoacetylene: New Lines and Sources in the Galaxy

Published online by Cambridge University Press:  14 August 2015

M. Morris ,
Patrick Palmer ,
B. E. Turner  and
B. Zuckerman
M. Morris
Affiliation:
University of Chicago, Chicago, Ill. 60637, U.S.A.
Patrick Palmer
Affiliation:
University of Chicago, Chicago, Ill. 60637, U.S.A.
B. E. Turner
Affiliation:
National Radio Astronomy Observatory∗∗ Green Bank, W.V. 24944, U.S.A.
B. Zuckerman
Affiliation:
University of Maryland, College Park, Md. 20740, U.S.A.

Abstract

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Microwave emission from the J = 8 → 7 through the J = 11 → 10 rotational transitions of HC3N has been detected in the directions of Sgr(NH3A), Sgr B2, and Orion A. A map of the J = 8 → 7 emission around Sgr B2 shows that the emitting region extends at least 2′ in galactic longitude and 3′ in galactic latitude. Column densities may be comparable to those of HCN in some sources. This molecule is thus more abundant in the interstellar medium than would be expected from its complexity, and may provide clues to formation processes where it is found.

With a reasonable model for excitation of the rotational levels, we have used the ratio of antenna temperatures of these 2 lines to derive a value for the molecular density in the region where the lines originate. For Sgr B2, this yields NH2 ≈ 106, and for Sgr(NH3A), NH2 ≈ 6 × 104.

Type
Part VII Molecules, Theory and Observations
Information
Symposium - International Astronomical Union , Volume 52: Interstellar Dust and Related Topics , 1973 , pp. 381 - 385
Copyright
Copyright © Reidel 1973 

References

Turner, B. E.: 1971, Astrophys. J. Letters 163, L35.CrossRefGoogle Scholar
Turner, B. E., Gordon, M. A., and Wrixon, G. T.: 1972, Astrophys. J. 177, 609.CrossRefGoogle Scholar
Zuckerman, B., Morris, M., Turner, B. E., and Palmer, P.: 1971 Astrophys. J. Letters 169, L105.Google Scholar