In-orbit performance and calibration of the Hard X-ray Imager onboard Hitomi (ASTRO-H)

Kouichi Hagino, Kazuhiro Nakazawa, Goro Sato, Motohide Kokubun, Teruaki Enoto, Yasushi Fukazawa, Katsuhiro Hayashi, Jun Kataoka, Junichiro Katsuta, Shogo B. Kobayashi, Philippe Laurent, Francois Lebrun, Olivier Limousin, Daniel Maier, Kazuo Makishima, Taketo Mimura, Katsuma Miyake, Tsunefumi Mizuno, Kunishiro Mori, Hiroaki Murakami & 20 others Takeshi Nakamori, Toshio Nakano, Hirofumi Noda, Hirokazu Odaka, Masanori Ohno, Masayuki Ohta, Shinya Saito, Rie Sato, Hiroyasu Tajima, Hiromitsu Takahashi, Tadayuki Takahashi, Shin'ichiro Takeda, Takaaki Tanaka, Yukikatsu Terada, Hideki Uchiyama, Yasunobu Uchiyama, Shin Watanabe, Kazutaka Yamaoka, Yoichi Yatsu, Takayuki Yuasa

    Research output: Contribution to journalArticle

    3 Citations (Scopus)

    Abstract

    The Hard X-ray Imager (HXI) onboard Hitomi (ASTRO-H) is an imaging spectrometer covering hard x-ray energies of 5 to 80 keV. Combined with the Hard X-ray Telescope, it enables imaging spectroscopy with an angular resolution of 10.7 half-power diameter, in a field of view of 9' × 9'. The main imager is composed of four layers of Si detectors and one layer of CdTe detector, stacked to cover a wide energy band up to 80 keV, surrounded by an active shield made of Bi4Ge3O12 scintillator to reduce the background. The HXI started observations 12 days before the Hitomi loss and successfully obtained data from G21.5-0.9, Crab, and blank sky. Utilizing these data, we calibrate the detector response and study properties of in-orbit background. The observed Crab spectra agree well with a powerlaw model convolved with the detector response, within 5% accuracy. We find that albedo electrons in specified orbit strongly affect the background of the Si top layer and establish a screening method to reduce it. The background level over the full field of view after all the processing and screening is as low as the preflight requirement of 1 - 3 × 10-4 counts s-1 cm-2 keV-1.

    Original languageEnglish
    Article number021409
    JournalJournal of Astronomical Telescopes, Instruments, and Systems
    Volume4
    Issue number2
    DOIs
    Publication statusPublished - 2018 Apr 1

    Fingerprint

    Image sensors
    Orbits
    Calibration
    calibration
    Detectors
    orbits
    X rays
    crabs
    detectors
    field of view
    crab
    Screening
    x rays
    screening
    Imaging techniques
    imaging spectrometers
    blanks
    background level
    angular resolution
    albedo

    Keywords

    • Astronomy
    • Imaging
    • Satellites
    • Semiconductors
    • Spectroscopy
    • X-rays

    ASJC Scopus subject areas

    • Electronic, Optical and Magnetic Materials
    • Control and Systems Engineering
    • Instrumentation
    • Astronomy and Astrophysics
    • Mechanical Engineering
    • Space and Planetary Science

    Cite this

    In-orbit performance and calibration of the Hard X-ray Imager onboard Hitomi (ASTRO-H). / Hagino, Kouichi; Nakazawa, Kazuhiro; Sato, Goro; Kokubun, Motohide; Enoto, Teruaki; Fukazawa, Yasushi; Hayashi, Katsuhiro; Kataoka, Jun; Katsuta, Junichiro; Kobayashi, Shogo B.; Laurent, Philippe; Lebrun, Francois; Limousin, Olivier; Maier, Daniel; Makishima, Kazuo; Mimura, Taketo; Miyake, Katsuma; Mizuno, Tsunefumi; Mori, Kunishiro; Murakami, Hiroaki; Nakamori, Takeshi; Nakano, Toshio; Noda, Hirofumi; Odaka, Hirokazu; Ohno, Masanori; Ohta, Masayuki; Saito, Shinya; Sato, Rie; Tajima, Hiroyasu; Takahashi, Hiromitsu; Takahashi, Tadayuki; Takeda, Shin'ichiro; Tanaka, Takaaki; Terada, Yukikatsu; Uchiyama, Hideki; Uchiyama, Yasunobu; Watanabe, Shin; Yamaoka, Kazutaka; Yatsu, Yoichi; Yuasa, Takayuki.

    In: Journal of Astronomical Telescopes, Instruments, and Systems, Vol. 4, No. 2, 021409, 01.04.2018.

    Research output: Contribution to journalArticle

    Hagino, K, Nakazawa, K, Sato, G, Kokubun, M, Enoto, T, Fukazawa, Y, Hayashi, K, Kataoka, J, Katsuta, J, Kobayashi, SB, Laurent, P, Lebrun, F, Limousin, O, Maier, D, Makishima, K, Mimura, T, Miyake, K, Mizuno, T, Mori, K, Murakami, H, Nakamori, T, Nakano, T, Noda, H, Odaka, H, Ohno, M, Ohta, M, Saito, S, Sato, R, Tajima, H, Takahashi, H, Takahashi, T, Takeda, S, Tanaka, T, Terada, Y, Uchiyama, H, Uchiyama, Y, Watanabe, S, Yamaoka, K, Yatsu, Y & Yuasa, T 2018, 'In-orbit performance and calibration of the Hard X-ray Imager onboard Hitomi (ASTRO-H)' Journal of Astronomical Telescopes, Instruments, and Systems, vol. 4, no. 2, 021409. https://doi.org/10.1117/1.JATIS.4.2.021409
    Hagino, Kouichi ; Nakazawa, Kazuhiro ; Sato, Goro ; Kokubun, Motohide ; Enoto, Teruaki ; Fukazawa, Yasushi ; Hayashi, Katsuhiro ; Kataoka, Jun ; Katsuta, Junichiro ; Kobayashi, Shogo B. ; Laurent, Philippe ; Lebrun, Francois ; Limousin, Olivier ; Maier, Daniel ; Makishima, Kazuo ; Mimura, Taketo ; Miyake, Katsuma ; Mizuno, Tsunefumi ; Mori, Kunishiro ; Murakami, Hiroaki ; Nakamori, Takeshi ; Nakano, Toshio ; Noda, Hirofumi ; Odaka, Hirokazu ; Ohno, Masanori ; Ohta, Masayuki ; Saito, Shinya ; Sato, Rie ; Tajima, Hiroyasu ; Takahashi, Hiromitsu ; Takahashi, Tadayuki ; Takeda, Shin'ichiro ; Tanaka, Takaaki ; Terada, Yukikatsu ; Uchiyama, Hideki ; Uchiyama, Yasunobu ; Watanabe, Shin ; Yamaoka, Kazutaka ; Yatsu, Yoichi ; Yuasa, Takayuki. / In-orbit performance and calibration of the Hard X-ray Imager onboard Hitomi (ASTRO-H). In: Journal of Astronomical Telescopes, Instruments, and Systems. 2018 ; Vol. 4, No. 2.
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    AU - Hagino, Kouichi

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    AU - Sato, Goro

    AU - Kokubun, Motohide

    AU - Enoto, Teruaki

    AU - Fukazawa, Yasushi

    AU - Hayashi, Katsuhiro

    AU - Kataoka, Jun

    AU - Katsuta, Junichiro

    AU - Kobayashi, Shogo B.

    AU - Laurent, Philippe

    AU - Lebrun, Francois

    AU - Limousin, Olivier

    AU - Maier, Daniel

    AU - Makishima, Kazuo

    AU - Mimura, Taketo

    AU - Miyake, Katsuma

    AU - Mizuno, Tsunefumi

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    AU - Murakami, Hiroaki

    AU - Nakamori, Takeshi

    AU - Nakano, Toshio

    AU - Noda, Hirofumi

    AU - Odaka, Hirokazu

    AU - Ohno, Masanori

    AU - Ohta, Masayuki

    AU - Saito, Shinya

    AU - Sato, Rie

    AU - Tajima, Hiroyasu

    AU - Takahashi, Hiromitsu

    AU - Takahashi, Tadayuki

    AU - Takeda, Shin'ichiro

    AU - Tanaka, Takaaki

    AU - Terada, Yukikatsu

    AU - Uchiyama, Hideki

    AU - Uchiyama, Yasunobu

    AU - Watanabe, Shin

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    AU - Yatsu, Yoichi

    AU - Yuasa, Takayuki

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    KW - Satellites

    KW - Semiconductors

    KW - Spectroscopy

    KW - X-rays

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