Fig. 7
The PAH mass fractions for the DGS (purple crosses) and KINGFISH (orange downward triangles) samples as a function of metallicity (left panel) and sSFR (right panel). The parameter fPAH is expressed in units of fPAH⊙, with fPAH⊙ = 4.57%. The distribution of fPAH is indicated on the side for both samples: plain purple line for DGS galaxies and dashed orange line for the KINGFISH sample. In each panel, the best power-law fit is indicated as a solid line, together with the 1σ dispersion as dotted lines.
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