Scaling coefficients from the luminosity in infrared bands to ΣSFR versus the pixel size, at 8 μm, 24 μm, 70 μm, and 100 μm, from the top left corner to the bottom right corner. The blue line indicates the value of the scaling factor when taking into account all pixels detected at a 3σ level in all six bands. The red (green) line indicates the scaling factor when considering only pixels with a ΣSFR higher (lower) than the median ΣSFR at a given resolution. The cyan and magenta lines represent regions in the top and bottom 15% in terms of ΣSFR. The shaded areas of the corresponding colours indicate the 1σ uncertainties. The horizontal dashed line at 24 μm (resp. 70 μm) indicates the scaling factor determined by Rieke et al. (2009), Calzetti et al. (2010) for entire galaxies. The crosses for the 70 μm and 100 μm bands indicate the scaling factor determined for individual galaxies on a scale of 200 pc (Li et al. 2013) and 700 pc (Li et al. 2010). The squares indicate mean values over several galaxies. The empty squares denote that no background subtraction was performed.
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