Astronomy and Astrophysics – Astronomy
Scientific paper
May 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991icar...91....7l&link_type=abstract
Icarus (ISSN 0019-1035), vol. 91, May 1991, p. 7-13.
Astronomy and Astrophysics
Astronomy
13
Cosmic Dust, Infrared Spectra, Interstellar Matter, Molecular Clouds, Radiation Transport, Grain Size, Infrared Astronomy Satellite, Limb Brightening, Optical Thickness, Temperature Distribution, Transient Heating
Scientific paper
Models of the effects of small grain-generated temperature fluctuations on the IR spectrum and surface brightness of externally heated interstellar dust clouds are presently constructed on the basis of a continuum radiation transport computer code which encompasses the transient heating of small dust grains. The models assume a constant fractional abundance of large and small grains throughout the given cloud. A comparison of model results with IRAS observations indicates that the observed 12-25 micron band emissions are associated with about 10-A radius grains, while the 60-100 micron emission is primarily due to large grains which are heated under the equilibrium conditions.
Leung Chun M.
Lis Dariusz C.
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