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Unidentified Infrared Emission Features

Published online by Cambridge University Press:  05 March 2015

Christine Joblin
Christine Joblin*
Affiliation:
Université de Toulouse; UPS-OMP; IRAP; Toulouse, France CNRS; IRAP; 9 Av. Colonel Roche, BP 44346, F-31028 Toulouse cedex 4, France email: [email protected]
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Abstract

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When referring to unidentified infrared emission features, one has in mind the series of aromatic IR bands (AIBs) between 3.3 and 15 μm that are observed in emission in many environments where UV photons irradiate interstellar matter. These bands are now used by astronomers to classify objects and characterize local physical conditions. However, a deep analysis cannot proceed without understanding the properties of the band carriers. Large polycyclic aromatic hydrocarbon molecules are attractive candidates but interstellar species are still poorly characterized. Various studies emphasize the need for tackling the link between molecular aromatic species, aliphatic material and very small carbonaceous grains. Other unidentified emission features such as the 6.9, 21 and 30 μm bands could be involved in the evolutionary scenario.

Keywords

Infrared: ISMISM: lines and bandsISM: moleculesstars: carbon
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 10 , Highlights H16: Highlights of Astronomy , August 2012 , pp. 699 - 700
Copyright
Copyright © International Astronomical Union 2015 

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