The hard X-ray imager (HXI) for the ASTRO-H mission

Goro Sato, Motohide Kokubun, Kazuhiro Nakazawa, Teruaki Enoto, Yasushi Fukazawa, Atsushi Harayama, Katsuhiro Hayashi, Jun Kataoka, Junichiro Katsuta, Madoka Kawaharada, Philippe Laurent, François Lebrun, Olivier Limousin, Kazuo Makishima, Tsunefumi Mizuno, Kunishiro Mori, Takeshi Nakamori, Hirofumi Noda, Hirokazu Odaka, Masanori OhnoMasayuki Ohta, Shinya Saito, Rie Sato, Hiroyasu Tajima, Hiromitsu Takahashi, Tadayuki Takahashi, Shinichiro Takeda, Yukikatsu Terada, Hideki Uchiyama, Yasunobu Uchiyama, Shin Watanabe, Kazutaka Yamaoka, Yoichi Yatsu, Takayuki Yuasa

Research output: Chapter in Book/Report/Conference proceedingConference contribution

22 Citations (Scopus)


The 6th Japanese X-ray satellite, ASTRO-H, is scheduled for launch in 2015. The hard X-ray focusing imaging system will observe astronomical objects with the sensitivity for detecting point sources with a brightness of 1/100,000 times fainter than the Crab nebula at > 10 keV. The Hard X-ray Imager (HXI) is a focal plane detector 12 m below the hard X-ray telescope (HXT) covering the energy range from 5 to 80 keV. The HXI is composed of a stacked Si/CdTe semiconductor detector module and surrounding BGO scintillators. The latter work as active shields for efficient reduction of background events caused by cosmic-ray particles, cosmic X-ray background, and in-orbit radiation activation. In this paper, we describe the detector system, and present current status of flight model development, and performance of HXI using an engineering model of HXI.

Original languageEnglish
Title of host publicationSpace Telescopes and Instrumentation 2014
Subtitle of host publicationUltraviolet to Gamma Ray
EditorsTadayuki Takahashi, Jan-Willem A. den Herder, Mark Bautz
ISBN (Electronic)9780819496126
Publication statusPublished - 2014
Externally publishedYes
EventSpace Telescopes and Instrumentation 2014: Ultraviolet to Gamma Ray - Montreal, Canada
Duration: 2014 Jun 222014 Jun 26

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X


ConferenceSpace Telescopes and Instrumentation 2014: Ultraviolet to Gamma Ray


  • ASTRO-H mission
  • Hard X-ray Imager
  • X-ray Astronomy

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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