Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984a%26a...138..237c&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 138, no. 2, Sept. 1984, p. 237-245.
Astronomy and Astrophysics
Astrophysics
12
Carbon Monoxide, Hydrogen Atoms, Hydroxyl Radicals, Interstellar Gas, Molecular Clouds, Spatial Distribution, Bl Lacertae Objects, Gaseous Diffusion, Molecular Spectra, Neutral Gases
Scientific paper
The authors have observed the 12CO and 13CO 2.6-mm lines in the direction of a dozen diffuse clouds. In a selection of 5 of these regions they have also observed the OH 18-cm lines and partially mapped the 12CO and H I 21-cm lines. The 12CO, 13CO, and OH lines are well correlated. The 13CO/12CO line ratio appears to be ≡4 times smaller in these clouds than in dense molecular clouds; the resulting 13CO/12CO abundance ratio is of the order of 1/60. The relation between the 21-cm line and molecular lines is not clear. Some molecular lines have 21-cm self-absorption counterparts, others have 21-cm emission counterparts. In many cases the 21-cm profile does not show any narrow feature at the molecular velocity. This may be attributed to saturation of the 21-cm line.
Brillet J.
Crovisier Jacques
Kazes Ilya
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