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Airborne observations of the infrared emission bands (1989)

Tielens, Alexander G. G. M. ; Cohen, M. ; Allamandola, Louis J. ; [et al.]

In: CASI

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Publication Date: 2013-08-29

Description: The data concerning low resolution airborne spectra from 5 to 8 microns available for a sample of 40 sources selected from the Infrared Astronomy Satellite low resolution spectral Atlas with polycyclic aromatic hydrocarbon (PAH) emission features, are discussed. A new emission band at 5.2 microns, previously predicted for PAHs, was found in 33 sources; it also correlates with the 7.7 microns band. This extends the spectrum of narrow observed PAH features to 3.3, 5.2, 5.6, 6.2, 6.9, 7.7, 8.7, 11.3, and 12.7 microns. From the data the relative strengths of most of these bands are defined in three separate nebular environments: planetaries, H II regions, and reflection nebulae. The differences in the PAHs spectra in those environments are analyzed.

Keywords: ASTRONOMY

Type: ESA, Infrared Spectroscopy in Astronomy; p 149-154

Format: text

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