Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...209.8423d&link_type=abstract
2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #84.23; Bulletin of the American Astronomical Society, V
Astronomy and Astrophysics
Astronomy
Scientific paper
We present new results from our on-going survey of diffuse O VI (λ1032) emission in the interstellar medium with the Far Ultraviolet Spectroscopic Explorer (FUSE). Background observations obtained during 2005 and 2006 have yielded five new O VI detections of 3σ significance, and archival searches have revealed a sixth. Our sight lines probe the Magellanic Stream as well as low-velocity gas associated with the Galactic disk.
O VI emission centered at VLSR = 19±13 km s-1 is seen in one spectrum that probes a line of sight 1' from the Seyfert 1 galaxy Fairall 9, which shows strong O VI absorption at low velocities (Wakker et al. 2003). From the ratio of our emission-line intensity to the O VI column density in the low-velocity gas, we derive an electron density of 0.01 cm-3 and a path length through the emitting gas of about 50 pc. The observed emission-line velocity and these derived properties suggest that the emitting gas is part of the corotating thick disk/halo of our Galaxy.
This work is supported by NASA contract NAS5-32985.
Dixon William V.
Sankrit Ravi
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