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Infrared and visible emission excesses due to luminescence from interstellar dust

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 (ERE) 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 > E g , the bandgap energy. When E g < 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 hv ∼ E g . The contribution of this luminescence to 12- and 25-μm IRAS fluxes is briefly discussed