Abstract
ABSTRACT The Hard X-ray Imager (HXI) is one of the instruments onboard International X-ray Observatory (IXO), to belaunched into orbit in 2020s. It covers the energy band of 10 40 keV, providing imaging-spectroscopy with aeld of view of 8 × 8arcmin 2 . The HXI is attached beneath the Wide Field Imager (WFI) covering 0.1 15 keV.Combined with the super-mirror coating on the mirror assembly, this conguration provides observation of X-raysource in wide energy band (0.1 40.0 keV) simultaneously, which is especially important for varying sources. TheHXI sensor part consists of the semiconductor imaging spectrometer, using Si in the medium energy detector andCdTe in the high energy detector as its material, and an active shield covering its back to reduce background inorbit. The HXI technology is based on those of the Japanese-lead new generation X-ray observatory ASTRO-H,and partly from those developed for Simbol-X. Therefore, the technological development is in good progress. Inthe IXO mission, HXI will provide a major assets to identify the nature of the object by penetrating into thickabsorbing materials and determined the inherent spectral shape in the energy band well above the structurearound Fe-K lines and edges.Keywords: International X-ray Observatory, Hard X-ray Imager, X-ray Astronomy
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