Ph. Durouchoux

SPI: The spectrometer aboard INTEGRAL

SPI is a high spectral resolution gamma-ray telescope on board the ESA mission INTEGRAL (International Gamma Ray Astrophysics Laboratory). It consists of an array of 19 closely packed germanium detectors surrounded by an active anticoincidence shield of BGO. The imaging capabilities of the instrument are obtained with a tungsten coded aperture mask located 1.7 m from the Ge array. The fully coded field-of-view is 16degrees, the partially coded field of view amounts to 31degrees, and the angular resolution is 2.5degrees. The energy range extends from 20 keV to 8 MeV with a typical energy resolution of 2.5 keV at 1.3 MeV. Here we present the general concept of the instrument followed by a brief description of each of the main subsystems. INTEGRAL was successfully launched in October 2002 and SPI is functioning extremely well.

Early SPI/INTEGRAL measurements of 511 keV line emission from the 4th quadrant of the Galaxy

We report the first measurements of the 511 keV line emission from the Galactic Centre (GC) region performed with the spectrometer SPI on the space observatory INTEGRAL (International Gamma-Ray Astrophysics Laboratory). Taking into account the range of spatial distribution models which are consistent with the data, we derive a flux of 9:9 +4:7 2:1 10 4 ph cm 2 s 1 and an intrinsic line width of 2:95 +0:45 0:51 keV (FWHM). The results are consistent with other high-spectroscopy measurements, though the width is found to be at the upper bound of previously reported values.We report the first measurements of the 511 keV line emission from the Galactic Centre (GC) region performed with the spectrometer SPI on the space observatory INTEGRAL (International Gamma-Ray Astrophysics Laboratory). Taking into account the range of spatial distribution models which are consistent with the data, we derive a flux of

Accretion-ejection instability and QPO in black hole binaries I. Observations

9.9^{+4.7}_{-2.1} \times 10^{-4}

Characterizing a new class of variability in GRS 1915+105 with simultaneous INTEGRAL/RXTE observations

ph cm

Millimeter-wave emission during the 2003 low excitation phase of eta Carinae

^{-2}

Energy dependence of a low frequency QPO in GRS 1915+105

s

Simultaneous Observations of GRS 1758–258 in 1997 by VLA, IRAM, SEST, RXTE, and OSSE: Spectroscopy and Timing

^{-1}

GMRT observations of the field of INTEGRAL X-ray sources- I

and an intrinsic line width of

Gamma-ray spectroscopy of the galactic center region: Confirmation of the time-variability of the positron annihilation line

2.95^{+0.45}_{-0.51}

SPI/INTEGRAL observation of the Cygnus region

keV (FWHM). The results are consistent with other high-spectroscopy measurements, though the width is found to be at the upper bound of previously reported values.