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Polycyclic Aromatic Hydrocarbons and the Extinction Curve

Published online by Cambridge University Press:  30 March 2011

C. Joblin ,
A.G.G.M. Tielens ,
G. Mulas ,
G. Malloci ,
C. Joblin  and
C. Cecchi–Pestellini
G. Mulas
Affiliation:
Istituto Nazionale di Astrofisica – Osservatorio Astronomico di Cagliari – strada 54, località Poggio dei Pini, 09012 – Capoterra (CA)
G. Malloci
Affiliation:
Istituto Nazionale di Astrofisica – Osservatorio Astronomico di Cagliari – strada 54, località Poggio dei Pini, 09012 – Capoterra (CA)
C. Joblin
Affiliation:
Université de Toulouse, UPS, CESR, 9 Av. colonel Roche, 31028 Toulouse Cedex 4, France CNRS, UMR 5187, 31028 Toulouse, France
C. Cecchi–Pestellini
Affiliation:
Istituto Nazionale di Astrofisica – Osservatorio Astronomico di Cagliari – strada 54, località Poggio dei Pini, 09012 – Capoterra (CA)

Abstract

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Aromatic carbon, in some form, has been an essential ingredient by and large in all models of the extinction curve, since the original proposal to attribute the bump at 217.5 nm to “astronomical graphite”. This aromatic carbon is most naturally identified, in up to date models, with a population of Polycyclic Aromatic Hydrocarbons (PAHs), free and/or clustered. In all models, this PAH population accounts for the far–UV nonlinear rise in the extinction curve, contributes to the bump and possibly part of the large set of unidentified, discrete absorption features in the visible (the Diffuse Interstellar Bands). We review the current state of our understanding of the contribution of PAHs to interstellar extinction, and what constraints can be imposed on the PAH population by fitting extinction models to observations.

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. 327 - 340
Copyright
© EAS, EDP Sciences 2011

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