Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...176..114c&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 176, no. 1, April 1987, p. 114-120.
Astronomy and Astrophysics
Astrophysics
8
Absorption Spectra, Hydroxyl Emission, Interstellar Matter, Molecular Flow, Carbon Monoxide, High Speed, Hydrogen Clouds, Line Spectra, Molecular Clouds
Scientific paper
High velocity OH has been detected in both emission and anomalous absorption from a variety of molecular bipolar flow sources. OH appears to sample a larger velocity extent than CO in these sources. The derived column densities indicate that OH is efficiently formed in bipolar flows, probably at the interface regions between the flows and the ambient cloud. If so, the OH/H2 ratio is deduced as ≡103times the typical interstellar ratio. The velocity extent of the OH wings in L 1551 is larger than previously observed in CO, suggesting that the mechanical energy contained in the flow may have been previously underestimated. The common occurrence of anomalous OH absorption in these regions suggests a pumping mechanism which is not highly specific.
Clark Frank O.
Turner Barry E.
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