Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...232..495s&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 232, no. 2, June 1990, p. 495-509. Research supported by NFR.
Astronomy and Astrophysics
Astrophysics
10
Interstellar Matter, Molecular Clouds, Astronomical Maps, Astronomical Models, Density Distribution, Interstellar Gas, Power Spectra, Star Formation, Velocity Distribution
Scientific paper
The density and velocity fluctuations present in molecular clouds are of fundamental importance, both for the evolution of the clouds and for the formation of stars. The natural line for this study is the (C-13)O J = 1-0 line which forms in LTE. This work presents synthetic line profile maps for hierarchical as well as MHD-wave models. A major result of the calculations is the conclusion that the line data can be compressed into a few cloud characteristics which contain a substantial part of the fundamental information on the cloud physics. These characteristics are the first three statistical moments of the distributions of the peak intensity, line velocity, line width and integrated intensity. Comparison with observed characteristics of the cloud B5 suggests that real clouds can be strongly influenced by waves, i.e., magnetic field effects.
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