The Soft Gamma-ray Detector for the ASTRO-H mission

The Soft Gamma-ray Detector (SGD) on board ASTRO-H (Japanese next high-energy astrophysics mission) is a Compton telescope with narrow fleld-of-view, which utilizes Compton kinematics to enhance its background rejection capabilities. It is realized as a hybrid semiconductor detector system which consists of silicon and CdTe (cadmium telluride) detectors. It can detect photons in a wide energy band (50-600 keV) at a background level 10 times better than that of the Suzaku Hard X-ray Detector, and is complimentary to the Hard X-ray Imager on board ASTRO-H with an energy coverage of 5-80 keV. Excellent energy resolution is the key feature of the SGD, allowing it to achieve good background rejection capability taking advantage of good angular resolution. An additional capability of the SGD, its ability to measure gamma-ray polarization, opens up a new window to study properties of gamma-ray emission processes. Here we describe the instrument design of the SGD, its expected performance, and its development status.

[1]  G. Di Cocco,et al.  The INTEGRAL mission , 2003 .

[2]  Tadayui Takahashi,et al.  Recent progress in CdTe and CdZnTe detectors , 2001, astro-ph/0107398.

[3]  T. Takahashi,et al.  Si/CdTe semiconductor compton camera , 2005, IEEE Symposium Conference Record Nuclear Science 2004..

[4]  T. Takahashi,et al.  High Energy Resolution Hard X-Ray and Gamma-Ray Imagers Using CdTe Diode Devices , 2009, IEEE Transactions on Nuclear Science.

[5]  Tadayuki Takahashi,et al.  Astro-E hard x-ray detector , 1996, Optics & Photonics.

[6]  Ryuichi Fujimoto,et al.  The X-Ray Observatory Suzaku , 2007 .

[7]  Tadayuki Takahashi,et al.  Wide band X-ray Imager (WXI) and Soft Gamma-ray Detector (SGD) for the NeXT Mission , 2004, SPIE Astronomical Telescopes + Instrumentation.

[8]  Tadayuki Takahashi,et al.  Hard X-ray imager (HXI) for the NeXT mission , 2008, Astronomical Telescopes + Instrumentation.

[9]  Andreas Zoglauer,et al.  Doppler broadening as a lower limit to the angular resolution of next-generation Compton telescopes , 2003, SPIE Astronomical Telescopes + Instrumentation.

[10]  M. Nomachi,et al.  Hard X-ray and Gamma-Ray Detectors for the NEXT mission , 2003 .

[11]  Motohide Kokubun,et al.  Activation properties of Schottky CdTe diodes irradiated by 150 MeV protons , 2002 .

[12]  Stephen S. Murray,et al.  Space Telescopes and Instrumentation 2010: Ultraviolet to Gamma Ray , 2010 .

[13]  Tuneyoshi Kamae,et al.  Future Hard X-ray and Gamma-ray Observations , 2001 .

[14]  武田 伸一郎,et al.  Experimental study of a Si/CdTe semiconductor Compton camera for the next generation of gamma-ray astronomy , 2009 .

[15]  Yasushi Fukazawa,et al.  Modeling and Reproducibility of Suzaku HXD PIN/GSO Background , 2009, 0901.0419.

[16]  S. Masciocchi,et al.  VIKING, a CMOS low noise monolithic 128 channel frontend for Si-strip detector readout , 1994 .

[17]  Yoshiharu Namba,et al.  The ASTRO-H Mission , 2009, Astronomical Telescopes + Instrumentation.

[18]  T. Takahashi,et al.  Performance of a low noise front-end ASIC for Si/CdTe detectors in Compton gamma-ray telescope , 2004, IEEE Transactions on Nuclear Science.

[19]  T. Takahashi,et al.  Experimental Results of the Gamma-Ray Imaging Capability With a Si/CdTe Semiconductor Compton Camera , 2009, IEEE Transactions on Nuclear Science.

[20]  Tadayuki Takahashi,et al.  High resolution CdTe detectors for the next-generation multi-Compton gamma-ray telescope , 2003, SPIE Astronomical Telescopes + Instrumentation.

[21]  T. Takahashi,et al.  Design and performance of soft gamma-ray detector for NeXT mission , 2004, IEEE Symposium Conference Record Nuclear Science 2004..