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PAH anions as carriers of the mid-IR emission bands in planetary nebulae

Published online by Cambridge University Press:  01 February 2008

Ryszard Szczerba ,
Christine Joblin ,
Olivier Berné  and
Cezary Szyszka
Ryszard Szczerba
Affiliation:
N. Copernicus Astronomical Center, Rabiańska 8, 87-100 Toruń, Poland email: [email protected]
Christine Joblin
Affiliation:
Centre d'Etude Spatiale des Rayonnements, Université Toulouse 3 et CNRS, 9 Av. du Colonel Roche, 31028 Toulouse cedex 04, France
Olivier Berné
Affiliation:
Centre d'Etude Spatiale des Rayonnements, Université Toulouse 3 et CNRS, 9 Av. du Colonel Roche, 31028 Toulouse cedex 04, France
Cezary Szyszka
Affiliation:
Nicolaus Copernicus University, Gagarina 11, 87-100 Toruń, Poland
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Abstract

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We present results of the mid-IR spectra decomposition for planetary nebulae and compact H ii regions in our Galaxy and Magellanic Clouds. The striking correlation between the required PAH component with “7.7” μm band shifted to about 7.8 μm and electron densities of the modeled sources allows us to argue that this PAH component may be in fact PAH anions (PAH−).

Keywords

(ISM:) dustextinction(ISM:) planetary nebulae: generalinfrared: ISM
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 4 , Symposium S251: Organic Matter in Space , February 2008 , pp. 207 - 212
Copyright
Copyright © International Astronomical Union 2008

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