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We investigate the orbital histories of Virgo galaxies at various stages ofHI gas stripping. In particular, we compare the location of galaxies withdifferent HI morphology in phase space. This method is a great tool for tracingthe gas stripping histories of galaxies as they fall into the cluster. Mostgalaxies at the early stage of HI stripping are found in the first infallregion of Virgo, while galaxies undergoing active HI stripping mostly appear tobe falling in or moving out near the cluster core for the first time. Galaxieswith severely stripped, yet symmetric, HI disks are found in one of twolocations. Some are deep inside the cluster, but others are found in thecluster outskirts with low orbital velocities. We suggest that the latter groupof galaxies belong to a "backsplash" population. These present the clearestcandidates for backsplashed galaxies observationally identified to date. Wefurther investigate the distribution of a large sample of HI-detected galaxiestoward Virgo in phase space, confirming that most galaxies are stripped oftheir gas as they settle into the gravitational potential of the cluster. Inaddition, we discuss the impact of tidal interactions between galaxies andgroup preprocessing on the HI properties of the cluster galaxies, and link theassociated star formation evolution to the stripping sequence of clustergalaxies.

A History of HI Stripping in Virgo: A Phase-space View of VIVA Galaxies