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Interstellar polycylic aromatic hydrocarbons: from space to the laboratory

Published online by Cambridge University Press:  26 February 2009

F. Boulanger ,
C. Joblin ,
A. Jones ,
S. Madden ,
C. Joblin  and
G. Mulas
C. Joblin
Affiliation:
Centre d'Étude Spatiale des Rayonnements, Université Paul Sabatier Toulouse 3 et CNRS, Observatoire Midi-Pyrénées, 9 Av. du Colonel Roche, 31028 Toulouse Cedex 04, France
G. Mulas
Affiliation:
INAF, Osservatorio Astronomico di Cagliari, Astrochemistry Group, Strada 54, Loc. Poggio dei Pini, 09012 Capoterra (CA), Italy
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Abstract

Polycyclic Aromatic Hydrocarbons (PAHs) are the most likely carriers proposed to account for the Aromatic Infrared Bands observed in emission between 3.3 and 12.7 μm, fulfilling both the chemical (presence of CC and CH aromatic bonds) and excitation constraints. We explain here how the emission spectrum of such species in astronomical environments can be modelled, to obtain for each infrared band both its intensity and its detailed profile.
The PAH model suffers from the lack of identification of individual species. Two strategies are described here that are currently being used to progress in this identification process. The first idea is that features in the far IR are much more specific to the exact molecular identity. Therefore their search with the coming Herschel Space Observatory will provide an unambiguous way to identify these molecules through their IR emission. Second, a reflection on where interstellar PAHs come from and how they evolve due to environmental conditions (UV irradiation, gas and dust interactions) is also necessary to get more insights into the nature of interstellar PAH candidates. In particular, recent studies have emphasized a chemical link between PAHs and very small grains in photodissociation regions.
Finally, we illustrate in this paper how progress in this field can only be attained by a synergy between astronomical observations, fundamental studies, both theoretical and experimental, and models.

Type
Research Article
Information
European Astronomical Society Publications Series , Volume 35: Interstellar Dust from Astronomical Observations to Fundamental Studies , 2009 , pp. 133 - 152
Copyright
© EAS, EDP Sciences, 2009

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