To appear in the proceedings of the GSFC workshop on "Probing the Physics of AGN by Multiwavelength Monitoring". (astro-ph/0008492)
Abstract. Composite spectra derived from HST observations of moderate redshift (z ~ 1) quasars show that the peak of the spectral energy distribution is at ~ 1000 Å, and that the ionizing continuum falls off smoothly to shorter wavelengths as f ~ -1.8. HUT and FUSE observations of nearby AGN (e.g., 3C 273) show similar results. FUSE spectra reveal a wealth of detail in the 912-1200 Å spectral range, including multi-component intrinsic absorption in the O VI doublet and Ly, and surprisingly strong narrow-line emission from O VI 1032,1038. Monitoring observations of AGN below 1200 Å are feasible, and such experiments could help to unravel the structure of intrinsic absorbers in AGN as well as the highest ionization portions of the broad-line region.
Table of Contents