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Star formation induced by a spiral shock wave, which in turn is generated bya spiral density wave, produces an azimuthal age gradient across the spiralarm, which has opposite signs on either side of the corotational resonance. Ananalysis of the spatial separation between young star clusters and nearby HIIregions made it possible to determine the position of the corotation radius inthe studied galaxies. Fourier analysis of the gas velocity field in the samegalaxies independently confirmed the corotation radius estimates obtained bythe morphological method presented here.

Azimuthal propagation of star formation in nearby spiral galaxies: NGC 628, NGC 3726 and NGC 6946