Fig. 7
Relation between Umin, tracer of the minimum intensity of the ISRF, the Hα and H-band surface brightness (left panel and right panel, respectively). Galaxies are color-coded according their morphological type. Red: Sa-Sb; green: Sbc-Scd; and blue: Sd-BCD. Filled symbols are for galaxies with a MIPS 24 μm observations and thus a good constraint on γ. Empty symbols are for galaxies with a WISE 22 μm observations. The Spearman correlation coefficient, ρ, is provided. The cross gives the typical error bar on the data.
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