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Ultraviolet continuum variability of the quasar 3C273

Ulrich, M. H.; Courvoisier, T. J. -L.

Several quasars show an excess of radiation in the ultraviolet over the power law defined by their infrared/optical continuum. Several authors^1-4 have fitted the infrared to ultraviolet spectrum of these quasars with a combination of a power law component, line emission, blends of Fe II lines, Balmer continuum and a black-body component…