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J. E. Scott, G. A. Kriss (STScI), M. Brotherton (U. Wyoming), R. F. Green (NOAO/KPNO), J. Hutchings (HIA/NRC), J. M. Shull (U. Colorado), W. Zheng (JHU)
The Far Ultraviolet Spectroscopic Explorer (FUSE) has surveyed a large sample ( > 100) of active galactic nuclei in the low redshift universe (z < 1). Its response at short wavelengths, down to the Galactic Lyman limit at 912 Å, makes it possible to directly measure the EUV spectral shape of QSOs and Seyfert 1 galaxies at z < 0.3, as well as their intrinsic fluxes at the Lyman limit. Using archival FUSE spectra, we form a composite EUV spectrum of QSOs at z < 1 and compare it to UV/optical composite spectra of QSOs at higher redshift from archival Hubble Space Telescope spectra, and from ground-based data from the First Bright Quasar Survey and the Sloan Digital Sky Survey to establish how QSO continuum and emission line characteristics may have evolved with time.
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Bulletin of the American Astronomical Society, 35 #3
© 2003. The American Astronomical Soceity.