Detection of nitric oxide in the dark cloud L134N

Details Detection of nitric oxide in the dark cloud L134N Detection of nitric oxide in the dark cloud L134N

Aug 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...359..121m&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 359, Aug. 10, 1990, p. 121-124.

Astronomy and Astrophysics

Astrophysics

22

Hydrogen, Interstellar Matter, Molecular Clouds, Molecular Ions, Nebulae, Nitric Oxide, Carbon, Interstellar Chemistry, Rotational Spectra

Scientific paper

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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