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25 years of PAH hypothesis

Published online by Cambridge University Press:  30 March 2011

C. Joblin ,
A.G.G.M. Tielens  and
A.G.G.M. Tielens
A.G.G.M. Tielens*
Affiliation:
Leiden Observatory, Leiden University, PO Box 9513, Leiden, The Netherlands

Abstract

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Strong IR emission features at 3.3, 6.2, 7.7, 8.6, and 11.2 μm are a common characteristic of the interstellar medium of the Milky Way and nearby galaxies and out to redshifts of3. Here, we review the history of the PAH hypothesis which attributes these emission features to vibrational fluorescence of large (~50 carbon-atom Polycyclic Aromatic Hydrocarbon molecules pumped by ultraviolet photons from nearby stars or the average interstellar radiation field. Over the last 25 years, our insight in the characteristics of these molecules and their role in the Universe has greatly improved and the PAH hypothesis is alive and well; not in the least due a remarkable adaptability. Not surprisingly, the precise characteristics of these species remains to be defined.

Type
Research Article
Information
European Astronomical Society Publications Series , Volume 46: PAHs and the Universe: A Symposium to Celebrate the 25th Anniversary of the PAH Hypothesis , 2011 , pp. 3 - 10
Copyright
© EAS, EDP Sciences 2011

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