X-ray polarimetry on-board HXMT

Details X-ray polarimetry on-board HXMT X-ray polarimetry on-board HXMT

2008-10-15

arxiv.org/abs/0810.2708v1

Proceedings of SPIE Astronomical Instrumentation 2008 Conference, 23-28 June 2008 Marseille, France, vol. 7011-85

Astronomy and Astrophysics

Astrophysics

10 pages, 7 figures

Scientific paper

10.1117/12.789363

The development of micropixel gas detectors, capable to image tracks produced in a gas by photoelectrons, makes possible to perform polarimetry of X-ray celestial sources in the focus of grazing incidence X-ray telescopes. HXMT is a mission by the Chinese Space Agency aimed to survey the Hard X-ray Sky with Phoswich detectors, by exploitation of the direct demodulation technique. Since a fraction of the HXMT time will be spent on dedicated pointing of particular sources, it could host, with moderate additional resources a pair of X-ray telescopes, each with a photoelectric X-ray polarimeter (EXP2, Efficient X-ray Photoelectric Polarimeter) in the focal plane. We present the design of the telescopes and the focal plane instrumentation and discuss the performance of this instrument to detect the degree and angle of linear polarization of some representative sources. Notwithstanding the limited resources, the proposed instrument can represent a breakthrough in X-ray Polarimetry.

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