Structure of molecular clouds. IV - Clouds with prominent star formation

Details Structure of molecular clouds. IV - Clouds with prominent star formation Structure of molecular clouds. IV - Clouds with prominent star formation

Dec 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980a%26a....92..142s&link_type=abstract

Astronomy and Astrophysics, vol. 92, no. 1-2, Dec. 1980, p. 142-150. Deutsche Forschungsgemeinschaft

Physics

3

Astronomical Spectroscopy, Cloud Physics, Molecular Clouds, Radiative Transfer, Star Formation, Astronomical Models, Carbon Monoxide, Spectral Line Width, Velocity Distribution

Scientific paper

The available observations (mainly lines of CO) are used to derive the structure of molecular clouds with prominent star formation. Turbulent collapse, random motion and mixed models are discussed. It is concluded that only the mixed model agrees with the observations. In the mixed model the turbulent and large scale systematic velocity fields are of the same order of magnitude. The turbulent model is unacceptable since the observed profiles are asymmetric. The collapse and random models on the other hand do not give reasonable line width ratios for (C-12)O lines as compared with (C-13)O lines. The qualitative structure can thus be determined, but the absolute values of H2 density is very uncertain. This leads to a large uncertainty in the total cloud mass, by a factor of at least 10-100.

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