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The Relative Distribution of Ammonia and Cyanobutadiyne Emission in Heiles 2 Dust Cloud

  • L. T. Little (a1), G. H. Macdonald (a1), P. W. Riley (a1) and D. N. Matheson (a1)

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A map of the NH3 (1,1) emission in Heiles 2 dust cloud, observed with 2.2 arc min. resolution, is presented and compared with that of the J = 9 → 8 transition of HC5N. Although the distribution of both molecules lies on a ridge, there is a marked anti-correlation in the observed antenna temperatures of the two molecules along it. This appears to be best explained as a variation in the relative abundances of the two molecules along the ridge by a factor 8-20 in a distance of 1018 cm.

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Copyright

References

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Broten, N.W., Oka, T., Avery, L.W., MacLeod, J.M., and Kroto, H.W.: 1978, Astrophys. J. (Letters) 223, pp. L105-L107.
Little, L.T., Riley, P.W., Macdonald, G.H., and Matheson, D.N.: 1978, Mon. Not. R. astr. Soc. 183, pp. 805-811.
Rydbeck, O.E.H., Sume, A., Hjalmarson, A., Elldér, J., Rönnäng, B.O., and Kollberg, E.: 1977, Astrophys. J. (Letters) 215, pp. L35-L40.
Smith, D., and Adams, N.G.: 1977, Astrophys. J. 217, pp. 741-748.
Walmsley, C.M., Winnewisser, G., and Toelle, F.: 1980, Astron. Astrophys., in press.

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