A new photoelectron imager measures X-ray polarization in a laboratory setup, suggesting advancements in astrophysical observations.
A new photoelectron imager for X�??ray astronomical polarimetry (PIAP) has been developed and tested at the Frascati laboratories (LNF�??INFN). A charge�??coupled device (CCD) is placed on one of the two conjugate foci of a Cassegrain reflective optics onto which are focused UV photons emitted by means of gas scintillation. This X�??ray detector has been built to image the angular distribution of the photoelectron tracks, whose anisotropy measures the X�??ray polarization. First tests, performed by using mixtures based on argon gas and benzene at low pressure, show events which are candidate tracks of photoelectrons and Auger electrons produced by a 55Fe source.
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G. et al. (1998) studied this question.
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