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Detection of nitric oxide in the dark cloud L134N
McGonagle, D.; Irvine, W. M.; Minh, Y. C.; Ziurys, L. M.
AA(Five College Radio Astronomy Observatory; Massachusetts, University, Amherst), AB(Five College Radio Astronomy Observatory; Massachusetts, University, Amherst), AC(Five College Radio Astronomy Observatory; Massachusetts, University, Amherst), AD(Arizona State University, Tempe, AZ)
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 359, Aug. 10, 1990, p. 121-124. (ApJ Homepage)
Publication Date:
NASA/STI Keywords:
Hydrogen, Interstellar Matter, Molecular Clouds, Molecular Ions, Nebulae, Nitric Oxide, Carbon, Interstellar Chemistry, Rotational Spectra
Bibliographic Code:


The first detection of interstellar nitric oxide (NO) in a cold dark cloud, L134N is reported. Nitric oxide was observed by means of its two 2 Pi 1/2, J = 3/2 - 1/2, rotational transitions at 150.2 and 150.5 GHz, which occur because of Lambda-doubling. The inferred column density for L134N is about 5 x 10 to the 14th/sq cm toward the SO peak in that cloud. This value corresponds to a fractional abundance relative to molecular hydrogen of about 6 x 10 to the -8th and is in good agreement with predictions of quiescent cloud ion-molecule chemistry. NO was not detected toward the dark cloud TMC-1 at an upper limit of 3 x 10 to the -8th or less.

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