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

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

2011-11-16

arxiv.org/abs/1111.3981v1

Astronomy and Astrophysics

Astrophysics

Galaxy Astrophysics

This paper is part of a set of three papers on circumgalactic gas observed with COS and STIS on HST, to be published in Scienc

Scientific paper

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.

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