QSO2 CANDIDATES FROM THE ROSAT NEP SURVEY

We propose to obtain XMMNewton spectra for the only three QSO2 candidates foundin the completely identified ROSAT North Ecliptic Pole survey. These objectsshow optical narrow highionization lines and very high Xray luminosities.Obscured QSO2 are a key ingredient in models of the diffuse Xray background,but they are not found in large number as expected. The spectra that we proposeto obtain will confirm the classification as obscured QSO2 if we detectabsorption also in the Xray band. It will be possible to probe the internalstructure of the emitting region, and detect the presence of absorbing orreflecting material. The complete identification status of the survey will allowus for the first time to compute QSO2 spatial density in the soft Xray sky. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]