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The role of PAHs in the physics of the interstellarmedium

Published online by Cambridge University Press:  30 March 2011

L. Verstraete*
Affiliation:
Institut d’Astrophysique Spatiale, UMR 8617, University Paris-Sud 11, Bât. 121, 91405 Orsay Cedex, France

Abstract

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In the interstellar medium (ISM), PAHs are abundant and also carry most of the dustsurface. They are thus privileged sites for surface reactions such as the formation ofH2. In regions penetrated by UV photons, PAHs loose electrons by thephotoelectric effect and efficiently heat the gas. In more shielded regions, PAH recombineand may carry an important fraction of the cloud electronic charge which plays animportant role in the gas dynamics and chemistry. We review here processes involving PAHswhich control key aspects of the physics of the ISM. We also discuss the correspondingobservational constraints. Most of these processes involve a detailed knowledge of thecharge of PAHs and we therefore review current models in this area. We argue that morelaboratory measurements of the rate of electronic capture on large PAH cations areneeded.

Type
Research Article
Copyright
© EAS, EDP Sciences 2011

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