IUE observations of high-redshift quasars

Details IUE observations of high-redshift quasars IUE observations of high-redshift quasars

Jun 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...281...76b&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 281, June 1, 1984, p. 76-89.

Astronomy and Astrophysics

Astrophysics

132

Iue, Quasars, Spectral Energy Distribution, Ultraviolet Spectra, Astronomical Spectroscopy, Continuous Spectra, Interstellar Extinction, Line Of Sight, Lyman Spectra, Metallicity, Opacity, Spectrophotometry

Scientific paper

The authors have measured the continuum energy distributions of nine high-redshift quasars (1.0 ≤ z ≤ 2.2) with the IUE and the Palomar 5 m multichannel spectrophotometer. Generally, the spectral energy distributions steepen at a rest wavelength of about 1200 Å, from a power law, in the optical, of spectral index α ≈ -0.5, to a spectral index of -3 to -5 shortward of 1200 Å. An extensive discussion of the physical causes of this spectral steepening is presented. Six of the spectra exhibit a total of nine optically thick Lyman limit discontinuities with zabs very low zem. Eight out of nine of the systems surveyed have associated Mg II or C IV doublets, with physical parameters consistent with the hypothesis that the absorbing material is associated with a galactic halo or disk.

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