The contribution of different charge-states of PAHs to the interstellar extinction curve

Details The contribution of different charge-states of PAHs to the interstellar extinction curve The contribution of different charge-states of PAHs to the interstellar extinction curve

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007msl..confe.127c&link_type=abstract

"Molecules in Space and Laboratory, meeting held in Paris, France, May 14-18, 2007. Editors: J.L. Lemaire, F. Combes. ISBN: 9782

Astronomy and Astrophysics

Astrophysics

Modelling_Interactions

Scientific paper

We constructed a simple dust-model able to reproduce the interstellar extinction curve while still being consistent with solar abundance constraints. It includes core-mantle spherical particles of mixed chemical composition (silicate core, sp2 carbonaceous layer, sp3 carbonaceous layer) in two sizeranges. The model requires an additional, independent component, assumed to be molecular, producing both the UV-bump and (partially) the far-UV rise. Mixtures of polycyclic aromatic hydrocarbons (PAHs) in different charge-states (0, +-1, and +2) were checked for consistence with the fitted contribution to the extinction, using a database of computed photo-absorption crosssections. Only neutrals and cations match the observational constraints, both in terms of spectral shape and of the fraction of interstellar carbon locked in PAHs (~70ppm). Our results pose strong upper limits to the fraction of PAH anions and dications in the average galactic diffuse interstellar medium.

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