Fig. 12
MIPS 24 μm to MIPS 70 μm ratio as a function of the radiation field intensity, as predicted by the model of Compiègne et al. (2011). Several dust-size distribution are used: (dashed line) BGs only, (dotted-line) VSGs only, and (solid line) a mixture of BGs and VSGs. The MIPS24-to-MIPS70 ratio for several structures within M 16 is indicated. The radiation field spectral shape is as described in the text with a) no extinction, or b) A(FUV) = 1 mag and the Lyman continuum photons removed.
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