Contribution of large polycyclic aromatic molecules to the infrared emission of the interstellar medium

Details Contribution of large polycyclic aromatic molecules to the infrared emission of the interstellar medium Contribution of large polycyclic aromatic molecules to the infrared emission of the interstellar medium

Jan 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985a%26a...142l..19p&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 142, no. 2, Jan. 1985, p. L19-L22.

Astronomy and Astrophysics

Astrophysics

211

Emission Spectra, Graphite, Infrared Spectra, Interstellar Extinction, Interstellar Matter, Molecular Clouds, Evaporation, Interstellar Radiation, Optical Properties, Particle Size Distribution

Scientific paper

Infrared emission spectra are derived for a population of interstellar graphite grains which have a size distribution similar to that of polycyclic aromatic molecules of a few angstroms. The optical properties of the molecule coronene are used to evaluate the oscillator strength of lattice vibrations, and an IR spectrum for coronene is calculated which takes into account the amounts of energy radiated in the far, near, and mid-infrared regions, respectively. It is found that the fraction of energy emitted in the mid-infrared is related to the amount of carbon in the molecules, and may be as large as 10 percent or more. On the basis of an analysis of the emission spectra, it is predicted that the Cirrus Clouds observed by the IRAS satellite at a wavelength of 100 should also be detectable at 12 microns. It is suggested that the emission of molecules like coronene is the major source of mid-infrared radiation in objects on the scale of a galaxy. A direct test of this suggestion is the spectroscopic signature which should be present in the emission.

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