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THE FIRST GLAST SYMPOSIUM, Stanford : United States (2007)
Soft gamma-ray galactic ridge emission as unveiled by SPI aboard INTEGRAL
Jürgen Knödlseder1, Vincent Lonjou1, 2, Georg Weidenspointner1, Pierre Jean1, Andy Strong3, Roland Diehl3, Bertrand Cordier4, Stéphane Schanne4, Christoph Winkler5

The origin of the soft gamma-ray (200 keV - 1 MeV) galactic ridge emission is one of the long-standing mysteries in the field of high-energy astrophysics. Population studies at lower energies have shown that emission from accreting compact objects gradually recedes in this domain, leaving place to another source of gamma-ray emission that is characterised by a hard power-law spectrum extending from 100 keV up to 100 MeV The nature of this hard component has remained so far elusive, partly due to the lack of sufficiently sensitive imaging telescopes that would be able to unveil the spatial distribution of the emission. The SPI telescope aboard INTEGRAL allows now for the first time the simultaneous imaging of diffuse and point-like emission in the soft gamma-ray regime. We present here all-sky images of the soft gamma-ray continuum emission that clearly reveal the morphology of the different emission components. We discuss the implications of our results on the nature of underlying emission processes and we put our results in perspective of GLAST studies of diffuse galactic continuum emission.
1 :  CESR - Centre d'étude spatiale des rayonnements
2 :  CENBG - Centre d'Etudes Nucléaires de Bordeaux Gradignan
3 :  MPE - MPE
4 :  DAPNIA - Département d'Astrophysique, de physique des Particules, de physique Nucléaire et de l'Instrumentation Associée
Physique/Astrophysique/Cosmologie et astrophysique extra-galactique

Planète et Univers/Astrophysique
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