The ultraviolet continuum of quasars. I - The shape of the continuum, continuum reddening and intervening absorption. II - Continuum variability

Details The ultraviolet continuum of quasars. I - The shape of the continuum, continuum reddening and intervening absorption. II - Continuum variability The ultraviolet continuum of quasars. I - The shape of the continuum, continuum reddening and intervening absorption. II - Continuum variability

Aug 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988mnras.233..801o&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 233, Aug. 15, 1988, p. 801-866. SERC-supported research

Astronomy and Astrophysics

Astronomy

91

Continuous Spectra, Interstellar Extinction, Quasars, Red Shift, Stellar Luminosity, Ultraviolet Astronomy, Emission Spectra, Iue, Line Spectra, Lyman Alpha Radiation, Lyman Beta Radiation, Molecular Clouds

Scientific paper

The authors present ultraviolet data for a sample of 81 quasars covering a wide redshift and luminosity range. After allowing for the effect of absorption due to intervening clouds, the intrinsic optical and ultraviolet continuum for quasars is found to steepen towards shorter wavelengths from ≈1 μm to ≈800 Å by ≈1 in spectral index. The mean ratio of the predicted flux at 2 keV, calculated by extrapolating the continuum shortward of Lyα, to that observed =5±3. The ultraviolet continuum above Lyα is found to get slightly harder with increasing redshift, suggesting possible evolution. No conclusive evidence is found for any intrinsic continuum reddening in the majority of known quasars. The increase with increasing redshift of the observed continuum depression between the Lyα and Lyβ/O VI emission lines relative to the continuum above Lyα implies evolution in the comoving number density of the intervening absorbing clouds.

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