To appear in the proceedings of the GSFC workshop on
"Probing the Physics of AGN by Multiwavelength Monitoring".
(astro-ph/0008492)
FAR-ULTRAVIOLET SPECTRA OF AGN: FIRST RESULTS FROM FUSE
Gerard A. Kriss
Space Telescope Science
Institute, 3700 San Martin Drive,
Baltimore, MD 21218
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
