Hydroxyl emission in translucent molecular clouds

Details Hydroxyl emission in translucent molecular clouds Hydroxyl emission in translucent molecular clouds

Aug 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...359..355m&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 359, Aug. 20, 1990, p. 355-362.

Astronomy and Astrophysics

Astrophysics

20

Hydroxyl Emission, Hyperfine Structure, Molecular Clouds, Abundance, Cosmic Dust, Interstellar Chemistry, Radio Telescopes

Scientific paper

Observations of the 18 cm ground-state hyperfine transitions of OH in translucent molecular clouds at high Galactic latitudes are presented. Fifteen lines of sight in nine high-latitude clouds were observed with the Arecibo radio telescope. In all instances, the column density obtained from the 1665 and 1667 MHz transitions is less than 2.0 x 10 to the 14th/sq cm. If the visual extinction and gas-to-dust ratio along the observed lines of sight are typical of translucent clouds, then the OH abundance with respect to H is of order 10 to the -8th to 10 to the -7th. This value is normal for low-extinction dust clouds and contradicts an earlier study of the OH abundance in high-latitude clouds. Without an enhanced OH molecular abundance, the case for a shock-front origin for the high-latitude molecular clouds is weakened.

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