Other
Scientific paper
Mar 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999esasp.427..579t&link_type=abstract
The Universe as Seen by ISO. Eds. P. Cox & M. F. Kessler. ESA-SP 427., p. 579
Other
57
Pahs, Infrared Spectroscopy, Dust, Hii Regions, Planetary Nebulae, Post-Agb Objects, Galactic Nuclei, Interstellar Medium, Uir Bands
Scientific paper
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 aromatic hydrocarbon species containing about 50 C-atoms: PAH molecules. Other 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, 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. These studies have made it quite clear that the universe as seen by ISO is a molecular universe.
Hony Sacha
Peeters Els
Tielens Alexander G. G. M.
van Kerckhoven C.
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