O vi in the local interstellar medium
M.A. Barstow, D.D. Boyce, B.Y.Welsh, R.Lallement, J.K.Barstow A.E., Forbes And S. Preval

TL;DR
This study investigates interstellar O VI absorption in 80 hot white dwarf spectra, analyzing its distribution and relation to local interstellar structures, revealing less O VI gas within the local cavity than previously thought.
Contribution
It provides the first comparison of interstellar O VI locations with X-ray background and neutral gas maps, refining understanding of hot gas distribution in the local interstellar medium.
Findings
No strong correlation between O VI and SXRB emission.
Most O VI is located at or beyond the local cavity boundary.
Less O VI gas exists within the local cavity than previously estimated.
Abstract
We report the results of a search for O VI absorption in the spectra of 80 hot DA white dwarfs observed by the FUSE satellite. We have carried out a detailed analysis of the radial velocities of interstellar and (where present) stellar absorption lines for the entire sample of stars. In approximately 35% of cases (where photospheric material is detected), the velocity differences between the interstellar and photospheric components were beneath the resolution of the FUSE spectrographs. Therefore, in 65% of these stars the interstellar and photospheric contributions could be separated and the nature of the O VI component unambiguously determined. Furthermore, in other examples, where the spectra were of a high signal-to-noise, no photospheric material was found and any O VI detected was assumed to be interstellar. Building on the earlier work of Oegerle et al. (2005) and Savage & Lehner…
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