Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991phdt.........4g&link_type=abstract
Ph.D. Thesis - Ludwig-Maximilians-Univ. Max-Planck-Inst. für Physik und Astrophysik, Garching (Germany, F.R.). Inst. für Extrate
Astronomy and Astrophysics
Astrophysics
6
Interstellar Matter, Line Spectra, Molecular Clouds, Star Formation, Submillimeter Waves, Astronomical Models, Astronomical Spectroscopy, Carbon Monoxide, Interstellar Gas, Spectroscopic Telescopes, Stellar Spectra
Scientific paper
The physical properties of molecular clouds associated with star formation are studied. Observations of the submillimeter and far infrared rotational lines of carbon monoxide reveals the existence of warm molecular gas in regions of massive star formation. Theoretical models of molecular clouds in the vicinity of H2 regions (photodissociation region models) indicate that they can produce this warm gas by UV heating. These models of energy balance on molecular clouds near star formation sites are tested by means of observations of an isotopic short millimeter line. The isotopic line is optically thin in most sources, making it possible to determine the column density in the warm gas component directly.
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