UV observation of a quasar sample

Abstract

The spectral indexes distribution of a quasar sample is derived from a far-UV survey. A red average spectrum is found which comes in support of significant evolution of the QSO spectral energy distribution (SED) since $z\approx 2.5$.

2 pages, 1 Postscript figure, conf_iap.sty. To appear in 13th IAP Workshop (1-5 July 1997) "Evolution of the Intergalactic Medium from QSO Absorption Line Systems"