The abundance of nitric oxide in TMC 1

Details The abundance of nitric oxide in TMC 1 The abundance of nitric oxide in TMC 1

Feb 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...268..212g&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 268, no. 1, p. 212-214.

Astronomy and Astrophysics

Astrophysics

11

Abundance, Interstellar Chemistry, Interstellar Matter, Molecular Clouds, Nitric Oxide, Astronomical Models, Chemical Composition, Density Distribution, Line Spectra

Scientific paper

We report the detection of nitric oxide, NO, in the dark cloud TMC 1; the column density is 2.7 +/- 0.5 x 10 exp 14/sq cm resulting in a fractional abundance relative to H2 of NO concentration of 2.7 x 10 exp -8, a factor eight less than in L134N, a dark cloud where NO has been previously observed. This large difference in abundance for a simple molecule is reproduced in two types of models of interstellar chemistry: (1) models at steady state with different depletions factors for C, N and O; (2) models with constant depletions but including mixing processes with largely different time scales. These two effects contribute probably to enhance the chemical differences between dark clouds, and throughout an individual cloud.

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