Polycyclic aromatic hydrocarbons in the infrared spectra of IRAS sources

Details Polycyclic aromatic hydrocarbons in the infrared spectra of IRAS sources Polycyclic aromatic hydrocarbons in the infrared spectra of IRAS sources

Sep 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989esasp.290..177j&link_type=abstract

In ESA, Infrared Spectroscopy in Astronomy p 177-187 (SEE N90-19084 11-89)

Astronomy and Astrophysics

Astronomy

4

H Ii Regions, Hydrocarbons, Infrared Astronomy Satellite, Infrared Spectra, Reflection Nebulae, Satellite Observation, Bandwidth, Emission Spectra, Line Spectra, Molecular Spectra

Scientific paper

The infrared spectra of the Infrared Astronomy Satellite (IRAS) sources, mainly H II regions and reflection nebulae, are presented. The observations include the IRAS Low Resolution Spectra (LRS) and ground based 3 microns spectra. All sources have strong emission features at 7.7, 8.6 and 11.3 microns in their LRS spectra; in all of them, the strong 3.3 microns emission band, often together with a feature at 3.4 microns and an emission plateau at 3.4 to 3.6 microns are detected. The data are analyzed in the context of the polycyclic aromatic hydrocarbons hypothesis. The size of the molecules and their degree of hydrogenation are investigated. For a few sources, 3 microns spectra at higher resolution reveal the presence of additional emission features in the 3.4 to 3.6 microns region. Possible interpretations for these bands are discussed. New laboratory spectra which show a general fit to the observed spectra are presented. Observational tests are suggested.

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