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Are the H I-deficient Galaxies on the Outskirts of Virgo Recent Arrivals?

The presence on the Virgo Cluster outskirts of spiral galaxies with gas deficiencies as strong as those of the inner galaxies stripped by the intracluster medium has led us to explore the possibility that some of these peripheral objects are not newcomers. A dynamical model for the collapse and rebound of spherical shells under the point-mass and radial-flow approximations has been developed to account for the amplitude of the motions in the Virgo I Cluster (VIC) region. According to our analysis, it is not infeasible that galaxies far from the cluster, including those in a gas-deficient group well to its background, went through its core a few Gyr ago. The implications would be (1) that the majority of the H I-deficient spirals in the VIC region might have been deprived of their neutral hydrogen by interactions with the hot intracluster medium and (2) that objects spending a long time outside the cluster cores might keep the gas-deficient status without altering their morphology.