Spectral energy distributions of SDSS-XMM quasars

G. Risaliti, M. Young, M. Elvis

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We present a sample of ~500 quasars with optical photometry and spectroscopy from the Sloan Digital Sky Survey DR4, and XMM-Newton X-ray spectra. We discuss the redshift evolution of the main spectral properties of quasars, and the correlation between optical and X-ray properties.