Detection of nitric oxide in the dark cloud L134N

D. McGonagle, L. M. Ziurys, W. M. Irvine, Y. C. Minh

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43 Scopus citations


We report the first detection of interstellar nitric oxide (NO) in a cold dark cloud, L134N. Nitric oxide was observed by means of its two 2Π1/2, J = 3/2 → 1/2, rotational transitions at 150.2 and 150.5 GHz, which occur because of Λ-doubling. The inferred column density for L134N is NNO ∼ 5 × 1014 cm-2 toward the SO peak in that cloud. This value corresponds to a fractional abundance relative to molecular hydrogen of fN0 ∼ 6 × 10-8 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 fNO ≤ 3 ×10-8.

Original languageEnglish (US)
Pages (from-to)121-124
Number of pages4
JournalAstrophysical Journal
Issue number1
StatePublished - Aug 10 1990


  • Interstellar: molecules
  • Nebulae: abundances

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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