H2CO mapping toward DR21 and W58 /K3 no. 50/

Details H2CO mapping toward DR21 and W58 /K3 no. 50/ H2CO mapping toward DR21 and W58 /K3 no. 50/

Nov 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981mnras.197..513f&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 197, Nov. 1981, p. 513-527.

Astronomy and Astrophysics

Astronomy

22

Acetylene, Astronomical Maps, Interstellar Matter, Molecular Clouds, Opacity, Radio Astronomy, Absorption Spectra, Abundance, Continuous Radiation, Data Reduction, H Ii Regions, Line Spectra, Spectrum Analysis, Stellar Evolution

Scientific paper

The distribution of 4.8-GHz H2CO absorption has been mapped against the galactic H II regions DR21 and W58 with 8 arcsec resolution. Opacity variations on scales less than 18 arcsec are seen against the extended continuum emission toward DR21. Extreme variations are observed toward the various radio components in W58. The H2CO equivalent width is 5.2 km/s in the direction of component C1; it is less than 0.03 toward W58. The linewidths are comparable to single-dish values for both DR21 and W58. H2 column densities derived from the H2CO equivalent widths are compared to the visual extinction. Large variations in the apparent H2CO/H2 abundance ratio are derived for W58.

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