Structure of molecular clouds. I - Observational constraints and CO line formation

Details Structure of molecular clouds. I - Observational constraints and CO line formation Structure of molecular clouds. I - Observational constraints and CO line formation

Oct 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980a%26as...42...23s&link_type=abstract

Astronomy and Astrophysics Supplement Series, vol. 42, Oct. 1980, p. 23-41. Deutsche Forschungsgemeinschaft

Astronomy and Astrophysics

Astrophysics

16

Carbon Monoxide, Interstellar Gas, Line Spectra, Molecular Clouds, Formaldehyde, H Ii Regions, Radiative Transfer

Scientific paper

The present status of molecular line observations is discussed. A classification of molecular clouds is suggested: type I shows little or no indication of star formation and type II has an internal H II-region. Theoretical calculations of CO-12 and CO-13 are made to show how variations in the cloud structure influence the observed quantities. The accuracy of the presently existing models derived from molecular lines is discussed and it is concluded that the uncertainties are large. The total mass is uncertain within at least a factor of 10 and quantitative determinations of the cloud structure cannot be made. Some qualitative trends of the density and the velocity field are given.

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