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Infrared emission from isolated dust clouds in the presence of very small dust grainsModels 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.
Document ID
19910052738
Document Type
Reprint (Version printed in journal)
Authors
Lis, Dariusz C. (California Institute of Technology, Pasadena; Rensselaer Polytechnic Institute, Troy, NY, United States)
Leung, Chun M. (Rensselaer Polytechnic Institute, Troy, NY, United States)
Date Acquired
August 15, 2013
Publication Date
May 1, 1991
Publication Information
Publication: Icarus
Volume: 91
ISSN: 0019-1035
Subject Category
ASTROPHYSICS
Funding Number(s)
CONTRACT_GRANT: NAG5-1182
CONTRACT_GRANT: AF-AFOSR-89-0104
CONTRACT_GRANT: NSF AST-88-14405
Distribution Limits
Public
Copyright
Other