Scalings of half light radius at 70 μm (left) and of corresponding rest frame FIR surface brightness (right) with far-infrared luminosity. 251 galaxies with LFIR>109 L⊙ are included to avoid dwarfs and faint companions. The red line is a power law fit. In the left panel, sizes derived in the literature for high redshift submm galaxies at longer rest wavelengths ~150−400 μm are included for comparison (pink symbols). These were not used for the fit.
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