RecentFUSEObservations of Diffuse Ovi Emission from the Interstellar Medium
| Autor: | W. Van Dyke Dixon, Ravi Sankrit |
|---|---|
| Rok vydání: | 2008 |
| Předmět: |
Physics
Astrophysics::High Energy Astrophysical Phenomena Far ultraviolet media_common.quotation_subject Astronomy Astronomy and Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics Astrophysics Galactic plane Galactic halo Interstellar medium Space and Planetary Science Sky Astrophysics::Galaxy Astrophysics media_common |
| Zdroj: | The Astrophysical Journal. 686:1162-1173 |
| ISSN: | 1538-4357 0004-637X |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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