Astronomy and Astrophysics – Astrophysics
Scientific paper
2008-04-24
Astronomy and Astrophysics
Astrophysics
5 pages, 3 figures, Astronomy & Astrophysics Letters, in press
Scientific paper
10.1051/0004-6361:200810015
Aims: We explore the relation between charge state of polycyclic aromatic hydrocarbons (PAHs) and extinction curve morphology. Methods: We fit extinction curves with a dust model including core-mantle spherical particles of mixed chemical composition (silicate core, $sp^2$ and $sp^3$ carbonaceous layers), and an additional molecular component. We use exact methods to calculate the extinction due to classical particles and accurate computed absorption spectra of PAHs in different charge states, for the contribution due to the molecular component, along a sample of five rather different lines of sight. Results: A combination of classical dust particles and mixtures of real PAHs satisfactorily matches the observed interstellar extinction curves. Variations of the spectral properties of PAHs in different charge states produce changes consistent with the varying relative strengths of the bump and non-linear far-UV rise.
Cecchi-Pestellini Cesare
Joblin Ch.
Malloci Giuliano
Mulas Giacomo
Williams David. A.
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