Gas Accretion in the Outskirts of the Virgo Cluster

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We describe several HI-rich galaxies in the outskirts of the Virgo Cluster with extended, complex HI distributions, and with moderately enhanced SFRs. We propose these galaxies are actively accreting gas onto their star-forming disks, boosting their SFRs. The extended HI has complex/disturbed kinematics, and some have irregular warps, consistent with accretion. These galaxies may represent an important stage of gas accretion, when a large quantity of gas falls to within 10-30\% of the galaxy’s virial radius, and is entering or just about to enter the star-forming disk. At this stage much of the gas can be in the form of HI, and it fuels star formation in the disk. We compare these galaxies to anemic Virgo spirals closer to the center of the cluster which have had their gaseous halos removed, i.e., they are starved.

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