EAS Publications Series
Volume 46, 2011PAHs and the Universe: A Symposium to Celebrate the 25th Anniversary of the PAH Hypothesis
|Page(s)||3 - 10|
|Published online||30 March 2011|
C. Joblin and A.G.G.M. Tielens (eds)
EAS Publications Series, 46 (2011) 3-10
25 years of PAH hypothesis
Leiden Observatory, Leiden University,
PO Box 9513,
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.
© EAS, EDP Sciences 2011
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