Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985a%26a...146...81l&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 146, no. 1, May 1985, p. 81-85.
Astronomy and Astrophysics
Astrophysics
186
Astronomical Spectroscopy, Cyclic Hydrocarbons, Diffuse Radiation, Interstellar Chemistry, Molecular Clouds, Molecular Spectra, Abundance, Aromatic Compounds, Infrared Spectra, Molecular Ions, Optical Transition, Photodissociation
Scientific paper
It is shown that polycyclic aromatic hydrocarbons (PAHs) provide a good match to spectral lines observed at visible wavelengths in the diffuse interstellar bands. Analysis demonstrates that molecules with 5-15 atoms will be dissociated photothermolytically in the diffuse interstellar medium (DIM), thereby ruling out carbon chains. PAHs, however, can be singly ionized in the DIM, and have exhibited optically active transitions in limited laboratory tests. Furthermore, PAHs are absent in regions where large volume of CO clouds are observed, which is consistent with the concept that the carbon necessary is locked up by the CO. Further laboratory and astrophysical data are necessary to confirm the positive results with the present data base.
d'Hendecourt Louis
Leger Alain
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