Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...192l..13l&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 192, no. 1-2, March 1988, p. L13-L16. ZWO-supported research.
Astronomy and Astrophysics
Astronomy
19
Brightness Distribution, Cosmic Dust, Infrared Astronomy Satellite, Interstellar Matter, Interstellar Radiation, Infrared Radiation, Optical Thickness, Radiative Transfer
Scientific paper
IRAS survey data and extinction measurements of four isolated clouds are examined. The clouds have a high degree of symmetry and contain no significant internal heating sources. Detailed analysis of the IR surface brightness distribution in individual clouds shows that the 60/100-micron ratio rises with increasing opacity (i.e., decreasing external radiation field), rather than remaining constant as has been suggested by large-scale IR analysis of the Galactic plane. The nonequilibrium emission observed at 12 microns has a different dependence on the opacity in clouds, with a clear decline in the 12/100-micron ratio towards larger optical depths. The rise in the 60/100-micron ratio rules out the possibility that the emission detected by IRAS is caused by a single grain population.
Chlewicki Grzegorz
Clark Frank O.
Laureijs Rene J.
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