Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991ssim.book.....g&link_type=abstract
Submillimeter spectroscopy of the interstellar medium in star forming regions., by Graf, U. U.. Max-Planck-Institut für Physik u
Astronomy and Astrophysics
Astrophysics
7
Scientific paper
The author investigates the physical properties of molecular clouds associated with star formation. Observations of the submillimeter and far-infrared rotational lines of carbon monoxide during the past years revealed the existence of warm molecular gas in regions of massive star formation. The most recent theoretical models of molecular clouds in the vicinity of H II regions can produce this warm gas by UV-heating. In order to test these models of the energy balance in molecular clouds near star formation sites, the author made the first observations of an isotopic short submillimeter line: the 13CO J = 6→5 line at 661 GHz. In essentially every source he observed, he found strong emission in this line. This high 13CO 6→5 line intensity is a direct proof for the presence of large amounts of warm and dense gas in star formation regions. In most sources the 13CO 6→5 line is narrow, showing that the warm gas is quiescent. In order to understand how the warm gas is connected to the cooler material, the author made a detailed multi-line study of a nearby massive star formation region (NGC 2024).
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