Large aromatic molecules in the interstellar medium.

Details Large aromatic molecules in the interstellar medium. Large aromatic molecules in the interstellar medium.

Apr 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989anph...14..181l&link_type=abstract

Ann. Phys. (Paris), Vol. 14, No. 2, p. 181 - 206

Astronomy and Astrophysics

Astronomy

7

Interstellar Molecules: Organic Molecules, Interstellar Bands: Infrared Radiation, Interstellar Molecules: Polycyclic Hydrocarbons

Scientific paper

The authors propose a consistent explanation of the so-called "unidentified" IR emission bands of the interstellar medium observed at 3.3 - 6.2 - 7.7 - 8.6 - 11.3 μm. They consider the transient heating of very small grains (≡50 atoms) to a peak temperature of ≡1000K by the absorption of a single UV photon and estimate the subsequent IR emission. The necessary stability of these clusters againts sublimation suggests that they are graphitic and specially polycyclic aromatic hydrocarbon (PAH) molecules. The authors estimate the emission spectrum of a typical PAH, coronene: C24H12, and find a suggestive spectroscopic agreement of the main spectral features with the astronomical ones. This explanation of the observed emission bands can account for their excitation mechanism which was not hitherto explained.

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