Recent FUSE Observations of Diffuse O VI Emission from the Interstellar Medium

Details Recent FUSE Observations of Diffuse O VI Emission from the Interstellar Medium Recent FUSE Observations of Diffuse O VI Emission from the Interstellar Medium

Oct 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008apj...686.1162d&link_type=abstract

The Astrophysical Journal, Volume 686, Issue 2, pp. 1162-1173.

Astronomy and Astrophysics

Astronomy

8

Galaxy: Structure, Ism: General, Ism: Structure, Galaxies: Magellanic Clouds, Ultraviolet: Ism

Scientific paper

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|<30deg), 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.
Based on observations made with the NASA-CNES-CSA Far Ultraviolet Spectroscopic Explorer. FUSE is operated for NASA by the Johns Hopkins University under NASA contract NAS5-32985.

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