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Nature of very small grains - PAH molecules or silicates?The predictions of the model of Puget et al. (1985) for the emission from Very Small Grains (VSGs) including both graphitic and silicate components are compared with published 8-13-micron observations of astronomical sources. The VSGs are found to be mainly graphitic and an upper limit is placed on the relative mass of silicates based on lack of the 9.7-micron silicate emission feature on M 82 and NGC 2023. This dissymetry in the composition of VSGs supports the suggestion that they are formed in grain-grain collisions where the behaviors of graphite and silicate grains are expected to be quite different.
Document ID
19860054052
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Desert, F. X.
(Ecole Normale Superieure Paris, France)
Leger, A.
(Ecole Normale Superieure Paris, France)
Puget, J. L.
(Ecole Normale Superieure Paris, France)
Boulanger, F.
(NASA Goddard Institute for Space Studies New York; Ecole Normale Superieure, Paris, France)
Sellgren, K.
(Hawaii, University Honolulu, United States)
Date Acquired
August 12, 2013
Publication Date
April 1, 1986
Publication Information
Publication: Astronomy and Astrophysics
Volume: 159
Issue: 1-2
ISSN: 0004-6361
Subject Category
Astrophysics
Accession Number
86A38790
Funding Number(s)
CONTRACT_GRANT: NATO-0214/85
Distribution Limits
Public
Copyright
Other

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