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Publications of the Astronomical Society of Japan, 2007-01, Vol.59 (sp1), p.S35-S51
Ort / Verlag
Oxford, UK: Oxford Universtiy Press
Erscheinungsjahr
2007
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
The Hard X-ray Detector (HXD) on board Suzaku covers a wide energy range from 10 keV to 600 keV by the combination of silicon PIN diodes and GSO scintillators. The HXD is designed to achieve an extremely low in-orbit background based on a combination of new techniques, including the concept of a well-type active shield counter. With an effective area of
$142 \,\mathrm{cm}^{2}$
at 20 keV and
$273 \,\mathrm{cm}^{2}$
at 150 keV, the background level at sea level reached
$\sim 1 \times 10^{-5} \,\mathrm{cts} \,\mathrm{s}^{-1} \,\mathrm{cm}^{-2} \,\mathrm{keV}^{-1}$
at 30 keV for the PIN diodes, and
$\sim 2 \times 10^{-5} \,\mathrm{cts} \,\mathrm{s}^{-1} \,\mathrm{cm}^{-2} \,\mathrm{keV}^{-1}$
at 100 keV, and
$\sim 7 \times 10^{-6} \,\mathrm{cts} \,\mathrm{s}^{-1} \,\mathrm{cm}^{-2} \,\mathrm{keV}^{-1}$
at 200 keV for the phoswich counter. Tight active shielding of the HXD results in a large array of guard counters surrounding the main detector parts. These anti-coincidence counters, made of
$\sim 4 \,\mathrm{cm}$
thick BGO crystals, have a large effective area for sub-MeV to MeV
$\gamma$
-rays. They work as an excellent
$\gamma$
-ray burst monitor with limited angular resolution (
$\sim 5^{\circ}$
). The on-board signal-processing system and the data transmitted to the ground are also described.