Decoupling luminosity and evolution in the spectral energy distribution of AGN

With this proposal we will construct a comprehensive library of Xray to midIRQSO spectral energy distributions for a single epoch (z1), covering two ordersof magnitude in luminosity. In doing so, we will decouple luminosity effectsfrom evolutionary effects and so determine the amount of radiation that isabsorbed and reprocessed by the torus, and how this depends on luminosity. TheSED library will represent a fundamental resource to reconcile the conflictingresults on AGN obscuration at different wavelengths, and for futureinvestigations of the accretion history of massive black holes. Our SDSS samplehas already been observed in the near and midIR with Spitzer; here we requestXMMNewton observations to provide the UV and Xray parts of the SED library. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]