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Abstract: The development of micropixel gas detectors, capable to image tracks producedin a gas by photoelectrons, makes possible to perform polarimetry of X-raycelestial sources in the focus of grazing incidence X-ray telescopes. HXMT is amission by the Chinese Space Agency aimed to survey the Hard X-ray Sky withPhoswich detectors, by exploitation of the direct demodulation technique. Sincea fraction of the HXMT time will be spent on dedicated pointing of particularsources, it could host, with moderate additional resources a pair of X-raytelescopes, each with a photoelectric X-ray polarimeter EXP2, Efficient X-rayPhotoelectric Polarimeter in the focal plane. We present the design of thetelescopes and the focal plane instrumentation and discuss the performance ofthis instrument to detect the degree and angle of linear polarization of somerepresentative sources. Notwithstanding the limited resources, the proposedinstrument can represent a breakthrough in X-ray Polarimetry.

Autor: Paolo Soffitta, Ronaldo Bellazzini, Gianpiero Tagliaferri, Enrico Costa, Giovanni Pareschi, Stefano Basso, Vincenzo Cotroneo, Mas

Fuente: https://arxiv.org/

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