The hard X-ray imager (HXI) onboard ASTRO-H

The HXI team

    研究成果: Conference contribution

    13 被引用数 (Scopus)

    抄録

    Hitomi X-ray observatory launched in 17 February 2016 had a hard X-ray imaging spectroscopy system made of two hard X-ray imagers (HXIs) coupled with two hard X-ray telescopes (HXTs). With 12 m focal length, they provide fine (2′ half-power diameter; HPD) imaging spectroscopy at 5 to 80 keV. The HXI main imagers are made of 4 layers of Si and a CdTe semiconductor double-sided strip detectors, stacked to enhance detection efficiency as well as to enable photon interaction-depth sensing. Active shield made of 9 BGO scintillators surrounds the imager to provide with low background. Following the deployment of the Extensible Optical Bench (EOB) on 28 February, the HXI was gradually turned on. Two imagers successfully started observation on 14 March, and was operational till the incident lead to Hitomo loss, on 26 March. All detector channels, 1280 ch of imager and 11 channel of active shields and others each, worked well and showed performance consistent with those seen on ground. From the first light observation of G21.5-0.9 and the following Crab observations, 5-80 keV energy coverage and good detection efficiency were confirmed. With blank sky observations, we checked our background level. In some geomagnetic region, strong background continuum, presumably caused by trapped electron with energy ∼100 keV, is seen. But by cutting the high-background time-intervals, the background became significantly lower, typically with 1-3 × 10-4 counts s-1 keV-1 cm-2 (here cm2 is shown with detector geometrical area). Above 30 keV, line and continuum emission originating from activation of CdTe was significantly seen, though the level of 1-4 × 10-4 counts s-1 keV-1 cm-2 is still comparable to those seen in NuSTAR. By comparing the effective area and background rate, preliminary analysis shows that the HXI had a statistical sensitivity similar to NuSTAR for point sources, and more than twice better for largely extended sources.

    本文言語English
    ホスト出版物のタイトルSpace Telescopes and Instrumentation 2016
    ホスト出版物のサブタイトルUltraviolet to Gamma Ray
    編集者Jan-Willem A. den Herder, Tadayuki Takahashi, Marshall Bautz
    出版社SPIE
    ISBN(電子版)9781510601895
    DOI
    出版ステータスPublished - 2016
    イベントSpace Telescopes and Instrumentation 2016: Ultraviolet to Gamma Ray - Edinburgh, United Kingdom
    継続期間: 2016 6 262016 7 1

    出版物シリーズ

    名前Proceedings of SPIE - The International Society for Optical Engineering
    9905
    ISSN(印刷版)0277-786X
    ISSN(電子版)1996-756X

    Other

    OtherSpace Telescopes and Instrumentation 2016: Ultraviolet to Gamma Ray
    国/地域United Kingdom
    CityEdinburgh
    Period16/6/2616/7/1

    ASJC Scopus subject areas

    • 電子材料、光学材料、および磁性材料
    • 凝縮系物理学
    • コンピュータ サイエンスの応用
    • 応用数学
    • 電子工学および電気工学

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