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Title:
Identification of the 'unidentified' IR emission features of interstellar dust?
Authors:
Leger, A.; Puget, J. L.
Affiliation:
AA(École Normale Superieure, Paris, France), AB(École Normale Superieure, Paris, France)
Publication:
Astronomy and Astrophysics (ISSN 0004-6361), vol. 137, no. 1, Aug. 1984, p. L5-L8. (A&A Homepage)
Publication Date:
08/1984
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
COSMIC DUST, EMISSION SPECTRA, INFRARED SPECTRA, INTERSTELLAR CHEMISTRY, CARBON, ELECTROMAGNETIC ABSORPTION, GRAPHITE, HYDROGEN, TRANSIENT HEATING
Bibliographic Code:
1984A&A...137L...5L

Abstract

A consistent explanation for the so-called unidentified IR emission features of interstellar dust is proposed. Following Sellgren (1984), the transient heating of very small grains to a peak temperature of about 1000 K by the absorption of a single UV photon is considered, and the subsequent IR emission is estimated. It is shown that graphite is one of the few solids that would not sublime under such conditions, and that the stretching modes of the CH radicals resulting from the conditions give an excellent fit to the observed 3.28 micron emission band. It is demonstrated that bulk graphite optical constants are inadequate for small carbon clusters due to a size effect. The expected emission of coronene, a medium-sized polycyclic aromatic molecule, heated to an average temperature of 600 K is computed and the spectral features are found to be in impressive agreement with most of the observed emission bands.

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