FUSE observations of warm absorbers in AGN

In a survey of the UV-brightest AGN using the Far Ultraviolet Spectroscopic Explorer (FUSE), we commonly find associated absorption in the O VI lambdalambda1032, 1038 resonance doublet. Of 34 Type I AGN observed to date with z < 0.15, 16 show detectable 0 VI absorption. Most absorption systems show multiple blueshifted components with intrinsic widths of similar to100 km s(-1) spread over a velocity range less than 1000 km s(-1) in width. With the exception of three galaxies (Ton S180, Mrk 478, and Mrk 279), those galaxies in our sample with 0 vi absorption and existing X-ray or longer wavelength UV observations also show C IV absorption and evidence for a soft X-ray warm absorber. In some cases, a UV absorption component has physical properties similar to the X-ray absorbing gas, but in others there is no clear physical correspondence between the UV and X-ray absorbing components.