New emission features in the 11-13 micron region and their relationship to polycyclic aromatic hydrocarbons

Details New emission features in the 11-13 micron region and their relationship to polycyclic aromatic hydrocarbons New emission features in the 11-13 micron region and their relationship to polycyclic aromatic hydrocarbons

Jun 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...341..270w&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 341, June 1, 1989, p. 270-277.

Astronomy and Astrophysics

Astronomy

78

Aromatic Compounds, H Ii Regions, Hydrocarbons, Infrared Spectra, Interstellar Matter, Planetary Nebulae, Emission Spectra, Infrared Astronomy Satellite, Molecular Structure, Signal To Noise Ratios

Scientific paper

Moderate-resolution spectra of NGC 7027, HD 44179, IRAS 2182+5050, and BD +30 deg 3639 are presented, showing that the 11.3-micron feature actually peaks at 11.22 microns. Evidence is found for new emission features near 11.9 and 12.7 microns, supporting an origin from PAHs. Also, the observed asymmetry of the 11.3-micron band is consistent with the anharmonicity expected in the C-H out-of-plane bending mode in PAHs. The analysis of the 11-13-micron emission suggests that the molecular structures of the most intensely emitting free PAHs vary between the high-excitation environment in NGC 7027 and the low-excitation but high-flux environment close to HD 44179. In addition, a series of regularly spaced features between 10 and 11 microns is detected in the spectrum of HD 44179, suggesting that a simple polyatomic hydride is present in the object's gas phase.

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