Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992mnras.258..773d&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 258, no. 4, p. 773-775.
Astronomy and Astrophysics
Astronomy
3
Cosmic Dust, Infrared Astronomy Satellite, Interstellar Matter, Interstellar Radiation, Carbon, Emission Spectra
Scientific paper
Since a simple relation exists between the energy absorbed by dust grains and that emitted as luminescence and thermal radiation, a comparison of extended emission and infrared (IR) luminosities can be used to constrain the quantum efficiency for luminescence by dust. Luminescence is emitted over a narrow band with E greater than about Eg, the bandgap energy. When Eg is less than 1 eV, as observed in many amorphous carbon solids, luminescence due to electron-hole recombination will occur in the mid-infrared and may be significant if excited with photons with h-nu approximately equal to Eg. The contribution of this luminescence to 12- and 25-micron IRAS fluxes is briefly discussed. Electron-hole recombination radiation can provide emission excesses in addition to those due to temperature spiking in small interstellar grains, and would occur from both small and large grains.
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