Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984mnras.210...23g&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 210, Sept. 1, 1984, p. 23-41.
Astronomy and Astrophysics
Astronomy
33
Continuous Spectra, Electron Transitions, Formaldehyde, Interstellar Matter, Molecular Clouds, Radio Astronomy, Astronomical Catalogs, H Ii Regions, Molecular Collisions, Optical Thickness
Scientific paper
Observations of the 211 - 212 transition of ortho-H2CO at 14.5 GHz have been made with the Parkes radio telescope towards about 100 continuum sources and dark clouds and compared with observations of the 110 - 111 transition. The observed linewidths were similar for both transitions, with median values of 4.8 km s-1 for the clouds towards continuum sources, and 1.7 km s-1 for dark clouds. Absorbing clouds near H II regions have higher excitation temperature (about 7K) and median optical depths (0.045 and 0.14 at 14.5 and 4.8 GHz) than the values (3.5K, 0.01, 0.08) for clouds well-separated from the H II regions. Comparison of the observations with an LVG model based on collisional excitation is discussed.
Gardner Frank F.
Whiteoak John B.
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