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Testing the attribution of selected DIBs to dehydrogenated coronene cations

Published online by Cambridge University Press:  01 February 2008

G. Mulas ,
G. Malloci ,
I. Porceddu  and
C. Joblin
G. Mulas
Affiliation:
Istituto Nazionale di Astrofisica–Osservatorio Astronomico di Cagliari, Strada n.54, Loc. Poggio dei Pini, I–09012 Capoterra (CA)(Italy) email: gmulas@ca.astro.it, gmalloci@ca.astro.it, iporcedd@ca.astro.it
G. Malloci
Affiliation:
Istituto Nazionale di Astrofisica–Osservatorio Astronomico di Cagliari, Strada n.54, Loc. Poggio dei Pini, I–09012 Capoterra (CA)(Italy) email: gmulas@ca.astro.it, gmalloci@ca.astro.it, iporcedd@ca.astro.it
I. Porceddu
Affiliation:
Istituto Nazionale di Astrofisica–Osservatorio Astronomico di Cagliari, Strada n.54, Loc. Poggio dei Pini, I–09012 Capoterra (CA)(Italy) email: gmulas@ca.astro.it, gmalloci@ca.astro.it, iporcedd@ca.astro.it
C. Joblin
Affiliation:
Centre d'Etude Spatiale des Rayonnements, CNRS et Université Paul Sabatier Toulouse 3, Observatoire Midi-Pyrénées, 9 Avenue du Colonel Roche, 31028 Toulouse cedex 04(France) email: chistine.joblin@cesr.fr
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Abstract

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Dehydrogenated coronene molecules have been proposed as the source of the UV-bump in the interstellar extinction curve as well as of some of the diffuse interstellar bands (DIBs). To test this hypothesis we have recently undertaken a combined (a) modelling, and (b) observational work on the subject. (a) In the framework of a global approach to the photophysics of a PAH–like species in space, we used combined theoretical calculated properties, obtained with (time–dependent) density functional theory, and a Monte–Carlo model simulating the time evolution of the population of levels of a given molecule, to obtain the detailed ro–vibrational spectral structure of selected electronic transitions. (b) From the observational point of view, we compare our predictions with observations of the well–known λ6284 and λ5780 DIBs.

Keywords

AstrochemistryISM: lines and bandsline: profilesmolecular processes
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 4 , Symposium S251: Organic Matter in Space , February 2008 , pp. 67 - 68
Copyright
Copyright © International Astronomical Union 2008

References

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