086233

We request to observe 7 Roma-BZCAT high redshift openParz>3closePar blazars with XMM. These sources are some of the most powerful of their class but crucially lack of X-ray measurements. We propose to observe them in the X-ray with XMM comma and in the optical with the supplementary observations from the optical monitor openParOMclosePar. The XMM observations will allow us to accurately measure the rising part of the inverse Compton spectrum comma which is expected to be very hard. The X-rays will be fundamental to determining the power of the jet and to deriving the shape of the underlying electron population responsible for the emission. The optical data will reveal the powerful accretion disk emission that will enable us to measure accretion disk luminosity and derive the black hole mass of these sources.