Fig. 4.
From: Synthesized grain size distribution in the interstellar medium
Upper panel: Extinction curves (extinction per hydrogen nucleus as a function of wavelength) calculated for the components used for the fitting to the grain size distribution. These components are shown in Fig. 1. The thin solid, dashed, and dot-dashed lines represent individual components processed for the following processes: disruption (shattering) for 3 Myr in Panel (a) and for 10 Myr in Panel (b), growth for 10 Myr in Panel (a) and for 30 Myr in Panel (b), and shock, respectively. The thick solid line shows the extinction curve for ng,s(a)/1.8 (divided by 1.8 because the component “g,s” contains a grain mass 1.8 times as much as the MRN). The dotted line presents the extinction curve for the MRN size distribution. The points show the observed Milky Way extinction curve taken from Pei (1992). Lower panel: Ratio of extinction curves to the extinction curve of the MRN size distribution. The line species in the lower panel correspond to those in the upper panel.