Issue |
A&A
Volume 388, Number 2, June III 2002
|
|
---|---|---|
Page(s) | 639 - 651 | |
Section | The Sun | |
DOI | https://doi.org/10.1051/0004-6361:20020416 | |
Published online | 31 May 2002 |
The profiles of the aromatic infrared bands explained with molecular carriers
1
Centre d'Étude Spatiale des Rayonnements, CNRS-UPS, BP 4346, 31028 Toulouse Cedex 04, France
2
Laboratoire de Chimie Physique, Université Paris Sud, Bât 350, 91405 Orsay Cedex, France
Corresponding author: C. Joblin, joblin@cesr.fr
Received:
29
September
2000
Accepted:
28
February
2002
Using a compilation of the photophysical properties of molecules such as
coronene, C24H12, we have constructed a numerical model to
calculate the IR emission spectrum of a population of polycyclic
aromatic hydrocarbon (PAH) species subjected to UV photons.
The model enables us to calculate not only the energy emitted in the IR bands but
also the detailed band profiles.
The calculated spectrum for a PAH size distribution following
with
was found to provide a
good match to the Aromatic Infrared Bands (AIBs) observed in the planetary
nebula IRAS 21282+5050. The match is especially good for the intensities and
for the profiles of the 6.2 and 11.3 μm bands. This work provides a
coherent picture of the AIB problem supporting the PAH molecular hypothesis.
It further underlines the poor spectral diversity contained in the AIB
spectrum putting new constraints on the nature of the emitting population.
Key words: infrared: ISM / ISM: lines and bands / line: profiles / ISM: general
© ESO, 2002
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