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X-ray polarimetry has great scientific potential and new experiments, such asX-Calibur, PoGOLite, XIPE, and GEMS, will not only be orders of magnitude moresensitive than previous missions, but also provide the capability to measurepolarization over a wide energy range. However, the measured spectra depend onthe collection area, detector responses, and, in case of balloon-borneexperiments, the absorption of X-rays in the atmosphere, all of which areenergy dependent. Combined with the typically steep source spectra, this leadsto significant biases that need to be taken into account to correctlyreconstruct energy-resolved polarization properties. In this paper, we presenta method based on an iterative unfolding algorithm that makes it possible tosimultaneously reconstruct the energy spectrum and the polarization propertiesas a function of true photon energy. We apply the method to a simulatedX-Calibur data set and show that it is able to recover both the energy spectrumand the energy-dependent polarization fraction.

An Unfolding Method for X-ray Spectro-Polarimetry