Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...249..550l&link_type=abstract
Astrophysical Journal, Part 1, vol. 249, Oct. 15, 1981, p. 550-562.
Astronomy and Astrophysics
Astronomy
41
Carbon Monoxide, Interstellar Matter, Line Spectra, Molecular Clouds, Red Shift, Stellar Evolution, Emission Spectra, H Ii Regions, Radio Sources (Astronomy), Spatial Distribution, Stellar Winds
Scientific paper
The redshifted and blueshifted CO line wings occurring in two oppositely directed lobes of molecular clouds associated with recent star formation may have their origin in nonisotropic mass outflow from young protostellar objects embedded in the cloud. The velocity extent of the CO wings is found to decrease with projected radial distance (R) from the dense core of the cloud, in keeping with a R exp -0.5 law which indicates deceleration of stellar wind material as it encounters the surrounding molecular cloud. In addition to determining that there are CO profiles with enhanced wings beyond the boundaries of the compact H II regions located within the dense cloud core, it is shown that carbon recombination lines at the H II region-molecular cloud interface have narrower line widths than the (C-13)O lines and much narrower than the broad CO profiles. The data suggest that carbon recombination line emission and the broad wings of CO lines arise in different regimes in the cloud.
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