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Proceedings Paper

Soft gamma-ray detector for the ASTRO-H Mission
Author(s): Hiroyasu Tajima; Roger Blandford; Teruaki Enoto; Yasushi Fukazawa; Kirk Gilmore; Tuneyoshi Kamae; Jun Kataoka; Madoka Kawaharada; Motohide Kokubun; Philippe Laurent; Francois Lebrun; Olivier Limousin; Greg Madejski; Kazuo Makishima; Tsunefumi Mizuno; Kazuhiro Nakazawa; Masanori Ohno; Masayuki Ohta; Goro Sato; Rie Sato; Hiromitsu Takahashi; Tadayuki Takahashi; Takaaki Tanaka; Makoto Tashiro; Yukikatsu Terada; Yasunobu Uchiyama; Shin Watanabe; Kazutaka Yamaoka; Daisuke Yonetoku
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Paper Abstract

ASTRO-H is the next generation JAXA X-ray satellite, intended to carry instruments with broad energy coverage and exquisite energy resolution. The Soft Gamma-ray Detector (SGD) is one of ASTRO-H instruments and will feature wide energy band (40-600 keV) at a background level 10 times better than the current instruments on orbit. SGD is complimentary to ASTRO-H's Hard X-ray Imager covering the energy range of 5-80 keV. The SGD achieves low background by combining a Compton camera scheme with a narrow field-of-view active shield where Compton kinematics is utilized to reject backgrounds. The Compton camera in the SGD is realized as a hybrid semiconductor detector system which consists of silicon and CdTe (cadmium telluride) sensors. Good energy resolution is afforded by semiconductor sensors, and it results in good background rejection capability due to better constraints on Compton kinematics. Utilization of Compton kinematics also makes the SGD sensitive to the gamma-ray polarization, opening up a new window to study properties of gamma-ray emission processes. The ASTRO-H mission is approved by ISAS/JAXA to proceed to a detailed design phase with an expected launch in 2014. In this paper, we present science drivers and concept of the SGD instrument followed by detailed description of the instrument and expected performance.

Paper Details

Date Published: 29 July 2010
PDF: 17 pages
Proc. SPIE 7732, Space Telescopes and Instrumentation 2010: Ultraviolet to Gamma Ray, 773216 (29 July 2010); doi: 10.1117/12.857531
Show Author Affiliations
Hiroyasu Tajima, Kavli Institute for Particle Astrophysics and Cosmology, Stanford Univ. (United States)
Roger Blandford, Kavli Institute for Particle Astrophysics and Cosmology, Stanford Univ. (United States)
Teruaki Enoto, Kavli Institute for Particle Astrophysics and Cosmology, Stanford Univ. (United States)
Yasushi Fukazawa, Hiroshima Univ. (Japan)
Kirk Gilmore, Kavli Institute for Particle Astrophysics and Cosmology, Stanford Univ. (United States)
Tuneyoshi Kamae, Kavli Institute for Particle Astrophysics and Cosmology, Stanford Univ. (United States)
Jun Kataoka, Waseda Univ. (Japan)
Madoka Kawaharada, Institute of Space and Astronautical Science (Japan)
Motohide Kokubun, Institute of Space and Astronautical Science (Japan)
Philippe Laurent, IRFU, Service d'Astrophysique, CEA Saclay (France)
Francois Lebrun, IRFU, Service d'Astrophysique, CEA Saclay (France)
Olivier Limousin, IRFU, Service d'Astrophysique, CEA Saclay (France)
Greg Madejski, Kavli Institute for Particle Astrophysics and Cosmology, Stanford Univ. (United States)
Kazuo Makishima, The Univ. of Tokyo (Japan)
Tsunefumi Mizuno, Hiroshima Univ. (Japan)
Kazuhiro Nakazawa, The Univ. of Tokyo (Japan)
Masanori Ohno, Institute of Space and Astronautical Science (Japan)
Masayuki Ohta, Institute of Space and Astronautical Science (Japan)
Goro Sato, Institute of Space and Astronautical Science (Japan)
Rie Sato, Institute of Space and Astronautical Science (Japan)
Hiromitsu Takahashi, Hiroshima Univ. (Japan)
Tadayuki Takahashi, Institute of Space and Astronautical Science (Japan)
The Univ. of Tokyo (Japan)
Takaaki Tanaka, Kavli Institute for Particle Astrophysics and Cosmology, Stanford Univ. (United States)
Makoto Tashiro, Saitama Univ. (Japan)
Yukikatsu Terada, Saitama Univ. (Japan)
Yasunobu Uchiyama, Kavli Institute for Particle Astrophysics and Cosmology, Stanford Univ. (United States)
Shin Watanabe, Institute of Space and Astronautical Science (Japan)
The Univ. of Tokyo (Japan)
Kazutaka Yamaoka, Aoyama Gakuin Univ. (Japan)
Daisuke Yonetoku, Kanazawa Univ. (Japan)


Published in SPIE Proceedings Vol. 7732:
Space Telescopes and Instrumentation 2010: Ultraviolet to Gamma Ray
Monique Arnaud; Stephen S. Murray; Tadayuki Takahashi, Editor(s)

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