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The PAH Hypothesis after 25 Years

Published online by Cambridge University Press:  21 December 2011

Els Peeters
Els Peeters*
Affiliation:
Department of Physics and Astronomy, University of Western Ontario, London, ON N6A 3K7, Canada email: [email protected] SETI Institute, 189 Bernardo Ave., Suite 100, Mountain View, CA 94043, USA email: [email protected]
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Abstract

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The infrared spectra of many galactic and extragalactic objects are dominated by emission features at 3.3, 6.2, 7.7, 8.6 and 11.2 μm. The carriers of these features remained a mystery for almost a decade, hence the bands were dubbed the unidentified infrared (UIR) bands. Since the mid-80's, the UIR bands are generally attributed to the IR fluorescence of Polycyclic Aromatic Hydrocarbon molecules (PAHs) upon absorption of UV photons – the PAH hypothesis. Here we review the progress made over the past 25 years in understanding the UIR bands and their carriers.

Keywords

infrared emission featuresISM: moleculesISM: lines and bands(stars:) circumstellar matterinfrared: generalastrochemistrytechniques: spectroscopic
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 7 , Symposium S280: The Molecular Universe , June 2011 , pp. 149 - 161
Copyright
Copyright © International Astronomical Union 2011

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