SPI/INTEGRAL in-flight performance

Abstract

The SPI instrument has been launched on-board the INTEGRAL observatory on October 17, 2002. SPI is a spectrometer devoted to the sky observation in the 20 keV-8 MeV energy range using 19 germanium detectors. The performance of the cryogenic system is nominal and allows to cool the 19 kg of germanium down to 85 K with a comfortable margin. The energy resolution of the whole camera is 2.5 keV at 1.1 MeV. This resolution degrades with time due to particle irradiation in space. We show that the annealing process allows the recovery of the initial performance. The anticoincidence shield works as expected, with a low threshold at 75 keV, reducing the GeD background by a factor of 20. The digital front-end electronics system allows the perfect alignement in time of all the signals as well as the optimisation of the dead time (12%). We demonstrate that SPI is able to map regions as complex as the galactic plane. The obtained spectrum of the Crab nebula validates the present version of our response matrix. The 3 $\sigma$ sensitivity of the instrument at 1 MeV is 8 10${}^{-7}$ph$\cdot$cm${}^{-2}\cdot$s${}^{-1}\cdot$keV${}^{-1}$ for the continuum and 3 10${}^{-5}$ph$\cdot$cm${}^{-2}\cdot$s${}^{-1}$ for narrow lines.

10 pages, 18 figures, accepted for publication in A&A (special INTEGRAL volume)

References in corpus (5)

• INTEGRAL Spectrometer SPI's GRB detection capabilities. GRBs detected inside SPI's FoV and with the anticoincidence system ACS
• INTEGRAL/SPI ground calibration
• The Spiros imaging software for the Integral SPI spectrometer
• SPI/INTEGRAL observation of the Cygnus region
• Calibration of the Spectrometer aboard the INTEGRAL satellite

Cited by in corpus (92)

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• Astrophysical constraints from gamma-ray spectroscopy
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• INTEGRAL/SPI $\gamma$-ray line spectroscopy
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• Revisiting INTEGRAL/SPI observations of 44Ti from Cassiopeia A
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• Prospect of Studying Hard X- and Gamma-Rays from Type Ia Supernovae
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• Soft gamma-ray sources detected by INTEGRAL
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