Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985comap..11...83w&link_type=abstract
Comments on Modern Physics, Part C - Comments on Astrophysics (ISSN 0146-2970), vol. 11, Sept. 1985, p. 83-96.
Astronomy and Astrophysics
Astrophysics
4
Clumps, Formaldehyde, Molecular Clouds, Abundance, Angular Resolution, Emission Spectra, H Ii Regions, Protostars
Scientific paper
Clumps, small scale structures in molecular clouds, may provide the link between the smooth structure of Giant Molecular Clouds and stars or protostars. The dominant motion in the smallest and densest clumps observed so far seems to be rotation. A comparison of the linewidths and clump sizes show that clumps near H II regions do not seem to follow the relation found for those in dust clouds. Molecular clouds seem to be chemically inhomogeneous, and complex molecules are found mostly in clumps. For the sources examined so far, the relative abundance of a typical complex molecule, formaldehyde, does not decrease with increasing H2 density. This may indicate that molecules frozen onto grains are freed by starlight or shocks.
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