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Fig. 12


Distribution of IR sizes (half-light radius) of 119 local galaxies as derived from their 1.4 GHz radio continuum using Eq. (6). Galaxies with an IR surface brightness greater than ΣIR = 3 × 1010 L kpc-2, i.e., compact galaxies, are in blue, while extended galaxies are in red. The vertical dashed line indicates the typical resolution of  ~1.7 kpc of the mid-IR compactness at 13.2 μm estimated by Díaz-Santos et al. (2010).

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