Excitation mechanisms for the unidentified infrared emission features

Astronomy and Astrophysics – Astronomy

Scientific paper

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Cosmic Dust, Infrared Astronomy, Infrared Radiation, Molecular Excitation, Thermal Emission, Fluorescence, Interstellar Matter, Nebulae, Ultraviolet Radiation

Scientific paper

Infrared and radio observations of various objects are analyzed to put observational constraints on the mechanism which gives rise to the unidentified emission features at 3.3, 3.4, 6.2, 7.7, 8.6, and 11.3 microns. The results show that gas-grain collisions or fluorescence is not likely to be the excitation mechanism responsible for the observed features. Thermal emission by dust is reanalyzed and it is concluded that this mechanism can explain the emission features. A simple model in which the emission features arise in a population of small, hot, interstellar grains is constructed. These grains are very efficient radiators, and the emitting materials only need be a minor grain constituent to provide the power that is emitted in the features. The model offers, therefore, a simple explanation for the absence of these features in absorption.

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