2008ApJ...686.1162D

We present new results from our survey of diffuse O VI-emitting gas in the interstellar medium with the Far Ultraviolet Spectroscopic Explorer (FUSE). Background observations obtained since 2005 have yielded 11 new O VI detections of 3 σ significance, and archival searches have revealed two more. An additional 15 sight lines yield interesting upper limits. Combined with previous results, these observations reveal the large-scale structure of the O VI-bearing gas in the quadrant of the sky centered on the Magellanic Clouds. The most prominent feature is a layer of low-velocity O VI emission extending more than 70° from the Galactic plane. At low latitudes (|b|<30°), the emission comes from narrow, high-density interfaces in the local ISM. At high latitudes, the emission is from extended, low-density regions in the Galactic halo. We also detect O VI emission from the interface region of the Magellanic system, a structure recently identified from H I observations. These are the first detections of emission from high-ionization species in the Magellanic system outside of the Clouds themselves.