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Without a source of new gas, our Galaxy would exhaust its supply of gasthrough the formation of stars. Ionized gas clouds observed at high velocitymay be a reservoir of such gas, but their distances are key for placing them inthe Galactic halo and unraveling their role. We have used the Hubble SpaceTelescope to blindly search for ionized high-velocity clouds (iHVCs) in theforeground of Galactic stars. We show that iHVCs with 90 < |v_LSR| < 170 km/sare within one Galactic radius of the sun and have enough mass to maintain starformation, while iHVCs with |v_LSR|>170 km/s are at larger distances. These maybe the next wave of infalling material.

A Reservoir of Ionized Gas in the Galactic Halo to Sustain Star Formation in the Milky Way