Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...230l..25s&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 230, no. 2, April 1990, p. L25-L28.
Astronomy and Astrophysics
Astronomy
7
Emission Spectra, Infrared Astronomy Satellite, Interstellar Gas, Line Spectra, Molecular Clouds, Oxygen Spectra, Astronomical Models, Atomic Spectra, Cosmic Dust, Fine Structure
Scientific paper
The IRAS 60- and 100-micron flux measurements are commonly explained by dust continuum emission, but this explanation sometimes requires unexpectedly high dust temperatures. It is shown that the contribution of fine structure radiation of neutral oxygen, neutral O (63 microns), can be significant in the IRAS 60-micron band. The neutral O (63 microns) line emission together with the dust continuum emission offers a plausible explanation of the observed flux ratio I (60)/I (100), as well as of its variation in individual clouds. As an example, the cirrus cloud G230-28 N is discussed.
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