Six-centimeter H2CO observations - Envelopes of dark clouds

Details Six-centimeter H2CO observations - Envelopes of dark clouds Six-centimeter H2CO observations - Envelopes of dark clouds

Feb 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983a%26a...118..337v&link_type=abstract

Astronomy and Astrophysics, vol. 118, no. 2, Feb. 1983, p. 337-340.

Astronomy and Astrophysics

Astrophysics

8

Formaldehyde, Interstellar Matter, Line Spectra, Molecular Clouds, Molecular Spectra, Absorption Spectra, Density Distribution, Hyperfine Structure, Radio Spectra

Scientific paper

Observations of the 6 cm H2CO line in seven dark clouds are reported. Strong absorption lines have been detected over a region >10arcmin in each cloud. These observations can be compared with published results of 13CO and of 2 mm and 2 cm H2CO obtained with similar spatial resolution. The spatial extent of 6 cm absorption is comparable to that of 13CO emission in these clouds but much larger than the extent of H2CO 2 mm emission and 2 cm absorption. It is suggested that the 6 cm line arises from a lower density region than does either the 2 cm or 2 mm H2CO lines.

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