Astronomy and Astrophysics – Astronomy
Scientific paper
May 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980mnras.191..533g&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 191, May 1980, p. 533-546.
Astronomy and Astrophysics
Astronomy
45
Absorption Spectra, Formaldehyde, Microwave Emission, Molecular Absorption, Nebulae, Radio Astronomy, Brightness Temperature, Curve Fitting, Least Squares Method, Optical Thickness
Scientific paper
Using the Parkes 64-m telescope observations of the 5-GHz formaldehyde absorption line at 226 positions in the direction of southern dark nebulae were made. The absorption line was detected at 169 of these positions and extended integrations were obtained on 12 objects and the resulting profiles are used to determine excitation temperatures, optical depths and line velocities by least-squares fitting of model profiles. The distribution of H2CO was mapped in three larger objects, and the resultant maps are compared with other molecular-line observations.
Brooks John W.
Danziger Ivan John
Goss William Miller
Manchester Richard N.
Manefield Gwenyth A.
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