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Fig. 4


Relations at 33 pc (left), 260 pc (centre), and 2084 pc (right) of Lν(70 μm) versus Lν(24 μm) (top), and Lν(100 μm) versus Lν(70 μm) (bottom). All luminosities have been multiplied by a constant factor corresponding to a linear SFR estimator (a24 = 2.04 × 10-36M yr-1 W-1, a70 = 5.89 × 10-37M yr-1 W-1, and a100 = 5.17 × 10-37M yr-1 W-1) to place them on a similar scale. The colour of each point indicates ΣSFR following the colour bar at the right of each row. The red line indicates a one-to-one relation. We see the non-linear relations between the luminosities in different bands. These non-linearities are particularly apparent on the finest pixel scales. On coarser scales, the relations appear more linear, which is probably due to a mixing between diffuse and star-forming regions.

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