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Despite many studies of the star formation in spiral galaxies, a complete andcoherent understanding of the physical processes that regulate the birth ofstars has not yet been achieved, nor a unanimous consent was reached, despitethe many attempts, on the effects of the environment on the star formation ingalaxies member of rich clusters. We focus on the local and global Schmidt lawand we investigate how cluster galaxies have their star formation activityperturbed. We collect multifrequency imaging for a sample of spiral galaxies,member of the Virgo cluster and of the local field; we compute the surfacedensity profiles for the young and for the bulk of the stellar components, forthe molecular and for the atomic gas. Our analysis shows that the bulk of thestar formation correlates with the molecular gas, but the atomic gas isimportant or even crucial in supporting the star formation activity in theouter part of the disks. Moreover, we show that cluster members which sufferfrom a moderate HI removal have their molecular component and their SFRquenched, while highly perturbed galaxies show an additional truncation intheir star forming disks. Our results are consistent with a model in which theatomic hydrogen is the fundamental fuel for the star formation, either directlyor indirectly through the molecular phase; therefore galaxies whose HIreservoirs have been depleted suffer from starvation or even from truncation oftheir star formation activity.

The relationship between gas content and star formation rate in spiral galaxies. Comparing the local field with the Virgo cluster