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

Abstract

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

This paper is part of a set of three papers on circumgalactic gas observed with COS and STIS on HST, to be published in Science, together with related papers by Tripp et al. and Tumlinson et al., in the November 18, 2011 edition. This version has not undergone final copyediting. Please see Science online for the final printed version

References in corpus (10)

• The present-day star formation rate of the Milky-Way determined from Spitzer detected young stellar objects
• Accretion of gas onto nearby spiral galaxies
• Distances to Galactic high-velocity clouds. I. Cohen Stream, complex GCP, cloud g1
• Seeding the formation of cold gaseous clouds in Milky Way size halos
• Distances to Galactic high-velocity clouds. Complex C
• An Accurate Distance to High-Velocity Cloud Complex C
• A Survey of O VI, C III, and H I in Highly Ionized High-Velocity Clouds
• The High Velocity Gas toward Messier 5: Tracing Feedback Flows in the Inner Galaxy
• Reconstructing Deconstruction: High-Velocity Cloud Distance Through Disruption Morphology
• Metallicity and Physical Conditions in the Magellanic Bridge

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• Gas accretion in Milky Way-like galaxies: temporal and radial dependencies
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• Extraplanar H II Regions in Spiral Galaxies. I. Low-Metallicity Gas Accreting through the Disk-Halo Interface of NGC 4013
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