Fig. 2.From: Amorphous organic solids as a component of interstellar dustA typical spectral energy distributions (SED) of starburst galaxies consists of two major components: an optical component (peaking at ~0.4 μm) due to photoionized gas and an infrared component (peaking at ~100 μm) due to dust. The narrow features are atomic lines and the broad features between 5 and 20 μm marked as AIB are due to aromatic compounds. Figure adapted from Groves et al. (2008).Back to article page