M ay 2 01 8 In-Orbit Performance and Calibration of the Hard X-ray Imager ( HXI ) onboard Hitomi ( ASTRO-H )

The Hard X-ray Imager (HXI) onboard Hitomi (ASTRO-H) is an imaging spectrometer covering hard Xray energies of 5–80 keV. Combined with the hard X-ray telescope, it enables imaging spectroscopy with an angular resolution of 1.7 half-power diameter, in a field of view of 9 × 9. The main imager is composed of 4 layers of

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