Polycyclic aromatic hydrocarbons in the near-infrared spectra of 24 IRAS sources

Details Polycyclic aromatic hydrocarbons in the near-infrared spectra of 24 IRAS sources Polycyclic aromatic hydrocarbons in the near-infrared spectra of 24 IRAS sources

Jan 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...227..526j&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 227, no. 2, Jan. 1990, p. 526-541.

Astronomy and Astrophysics

Astronomy

77

Aromatic Compounds, Cyclic Hydrocarbons, H Ii Regions, Infrared Astronomy Satellite, Infrared Spectra, Interstellar Matter, Near Infrared Radiation, Planetary Nebulae, Reflection Nebulae

Scientific paper

Infrared spectra of 24 IRAS sources are presented. The observations include the IRAS Low Resolution Spectra (LRS) and ground-based three-micron spectrophotometry. These sources were selected from the IRAS-LRS database because they have strong emission features at 7.7, 8.6, and 11.3 micron in their LRS spectra. In all of them, the well-known 3.3-micron emission feature is detected which sometimes occurs together with a feature at 3.4 microns and/or an emission plateau at 3.4-3.6 microns. These observations are analyzed in the context of the polycyclic aromatic hydrocarbons (PAHs) hypothesis. The rather large sample of sources observed and the homogeneity of the data presented made it possible to perform a consistent analysis. In particular, the intensity ratio of the 11.3-micron to the 3.3-micron bands is studied, which is used to derive an average size of the emitting molecules. The emission of a cooling molecule is calculated in the various bands of PAH molecules measured in the laboratory. Discrepancies between the calculated and the observed spectra are tentatively interpreted in terms of dehydrogenation of the molecules.

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