Infrared emission from isolated dust clouds in the presence of very small dust grains

Journal Article · Wed May 01 00:00:00 EDT 1991 · Icarus (International Journal of the Solar System); (United States)

DOI:https://doi.org/10.1016/0019-1035(91)90121-9· OSTI ID:5516126

Lis, D C; Leung, C M ^[1]

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1. California Institute of Technology, Pasadena (USA) Rensselaer Polytechnic Institute, Troy, NY (USA)

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. 13 refs.

• OSTI ID: 5516126
• Journal Information: Icarus (International Journal of the Solar System); (United States), Vol. 91; ISSN 0019-1035
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
COSMIC DUST
INFRARED SPECTRA
INTERSTELLAR SPACE
BRIGHTNESS
COMPARATIVE EVALUATIONS
COMPUTER CODES
GRAIN SIZE
HEATING
INTERSTELLAR GRAINS
MATHEMATICAL MODELS
MOLECULES
RADIATION TRANSPORT
TEMPERATURE DISTRIBUTION
CRYSTAL STRUCTURE
DUSTS
MICROSTRUCTURE
OPTICAL PROPERTIES
PARTICLES
PHYSICAL PROPERTIES
SIZE
SPACE
SPECTRA
640105* - Astrophysics & Cosmology- Galaxies