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Interstellar and Circumstellar PAHs

  • A. G. G. M. Tielens (a1), C. van Kerckhoven (a1), E. Peeters (a1) and S. Hony (a1)

Abstract

ISO has shown that the mid–IR spectra of almost all sources are dominated by narrow emission features collectively known as the UIR bands. These bands are carried by a family of polycyclic aromatic hydrocarbon molecules containing about 50 C-atoms. Other classes of molecules such as C-chains as well as non-aromatic groups attached to the PAHs are much less abundant. ISO has revealed that the UIR spectrum is incredibly rich with a large number of weaker features, subfeatures, and shoulders; many of which were not known before. Some examples and the new insights they can provide are described. A systematic study of this spectral structure may well allow us to considerably narrow down the composition of the family of PAHs responsible for the observed emission.

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Interstellar and Circumstellar PAHs

  • A. G. G. M. Tielens (a1), C. van Kerckhoven (a1), E. Peeters (a1) and S. Hony (a1)

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