Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-11-14
Astronomy and Astrophysics
Astrophysics
10 pages, 10 figures. Invited review paper to appear in the proceedings of the conference "Astrophysics in the Far Ultraviolet
Scientific paper
The high spectral resolution and sensitivity of FUSE have enabled far-ultraviolet studies of AGN and QSOs that are a natural complement to observations using HST, Chandra, and XMM-Newton. Through synergistic use of the large sample of nearby AGN that serve as background probes of gas in the Galactic halo and the ISM, the FUSE PI team has observed a large number (approaching 100) of the nearest and brightest AGN. In addition to emission from O VI, we identify emission lines due to C III, N III, S IV, and He II in many of the Type-1 AGN. More than half of the Type 1 objects also show intrinsic absorption by the O VI doublet as well as C IV absorption and evidence of a soft X-ray warm absorber. Guest investigators have successfully coordinated FUSE observations of bright AGN with simultaneous HST and X-ray observations. These have contributed greatly to our understanding of the UV and X-ray absoring gas in AGN as either a wind from the accretion disk, or a thermally driven wind from the obscuring torus.
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