Upper left: radial profiles (in units of HLR) of the star formation rate surface density (ΣSFR), averaged in seven morphology bins. The horizontal line at 5 M⊙Gyr-1pc-2 indicates the average ΣSFR in the Milky Way (MW). Only the locations where the light fraction due to young populations is higher than 3.4% are included. Error bars show the dispersion (not the uncertainty) in log ΣSFR for all the spirals (black) and for Sb galaxies (green). Other panels: for each Hubble type, solid, dashed, and dotted lines show the mean profiles obtained by excluding xY< 3.4%, WHα< 3Å, and WHα< 6Å, respectively. The gray-dashed lines show ⟨ ΣSFR(R) ⟩ cosmic profiles, the SFR surface density profiles obtained assuming a constant rate of star formation throughout the Hubble time.
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