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Detection of H3+ in the diffuse interstellar medium toward Cygnus OB2 No. 12
B J McCall1, T R Geballe, K H Hinkle
1Department of Astronomy and Astrophysics, University of Chicago, Chicago, IL 60637, USA.
Abstract:
The molecular ion H3+ is considered the cornerstone of interstellar chemistry because it initiates the reactions responsible for the production of many larger molecules. Recently discovered in dense molecular clouds, H3+ has now been observed in the diffuse interstellar medium toward Cygnus OB2 No. 12. Analysis of H3+ chemistry suggests that the high H3+ column density (3.8 x 10(14) per square centimeter) is due not to a high H3+ concentration but to a long absorption path. This and other work demonstrate the ubiquity of H3+ and its potential as a probe of the physical and chemical conditions in the interstellar medium.
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