The ultraviolet spectra of intermediate-redshift quasars

Details The ultraviolet spectra of intermediate-redshift quasars The ultraviolet spectra of intermediate-redshift quasars

Apr 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...291..128k&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 291, April 1, 1985, p. 128-135.

Astronomy and Astrophysics

Astrophysics

67

Quasars, Seyfert Galaxies, Ultraviolet Spectra, Continuous Spectra, H Beta Line, Interstellar Extinction, Iue, Lyman Alpha Radiation, Red Shift, Spectral Energy Distribution, X Ray Spectra

Scientific paper

In the present sample of 21 intermediate redshift quasars, for which IUE Lyman-alpha line flux and UV continuum observations have been conducted, an extrapolation of the continuum to the X-ray region is noted to fall at least 2-sigma above the measured X-ray flux, at 2 keV, for two-thirds of the sample. The strength of Lyman-alpha is well correlated with the luminosity at 1450 A, and an estimate of the covering factor on the basis of the ratio of the number of Lyman-alpha to ionizing protons yields a value for the sample which, at about 0.17, is consistent with the number of observed Lyman discontinuities.

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