A photoelectric polarimeter for XEUS: a new window in x-ray sky
  XEUS is a large area telescope aiming to rise X-ray Astronomy to the level of Optical Astronomy in terms of collecting areas. It will be based on two satellites, locked on a formation flight, one with the optics, one with the focal plane. The present design of the focal plane foresees, as an auxiliary instrument, the inclusion of a Polarimeter based on a Micropattern Chamber. We show how such a device is capable to solve open problems on many classes of High Energy Astrophysics objects and to use X-ray sources as a laboratory for a substantial progress on Fundamental Physics. 
Ronaldo Bellazzini (1), Luca Baldini (1), Francesco Bitti (1),   Alessandro Brez (1), Francesco Cavalca (1), Luca Latronico ...