Imaging the Gamma-Ray Sky with SPI aboard INTEGRAL

Simple item page
dc.creatorKnödlseder, Jürgen
dc.creatorWeidenspointner, Georg
dc.creatorJean, Pierre
dc.creatorDiehl, Roland
dc.creatorStrong, Andrew
dc.creatorHalloin, Hubert
dc.creatorCordier, Bertrand
dc.creatorSchanne, Stéphane
dc.creatorWinkler, Chris
dc.date2007-12-11
dc.date.accessioned2026-07-07T08:48:34Z
dc.date.available2026-07-07T08:48:34Z
dc.descriptionThe spectrometer SPI on INTEGRAL allows for the first time simultaneous imaging of diffuse and point-like emission in the hard X-ray and soft gamma-ray regime. To fully exploit the capabilities of the instrument, we implemented the MREM image deconvolution algorithm, initially developed for COMPTEL data analysis, to SPI data analysis. We present the performances of the algorithm by means of simulations and apply it to data accumulated during the first 2 mission years of INTEGRAL. Skymaps are presented for the 1809 keV gamma-ray line, attributed to the radioactive decay of 26Al, and for continuum energy bands, covering the range 20 keV - 3 MeV. The 1809 keV map indicates that emission is clearly detected by SPI from the inner Galactic radian and from the Cygnus region. The continuum maps reveal the transition between a point-source dominated hard X-ray sky to a diffuse emission dominated soft gamma-ray sky. From the skymaps, we extract a Galactic ridge emission spectrum that matches well SPI results obtained by model fitting. By comparing our spectrum with the cumulative flux measured by IBIS from point sources, we find indications for the existence of an unresolved or diffuse emission component above ~100 keV.
dc.description12 pages, 7 figures
dc.identifierhttps://arxiv.org/abs/0712.1668
dc.identifierhttp://arxiv.org/abs/0712.1668
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/143987
dc.subjectAstrophysics
dc.titleImaging the Gamma-Ray Sky with SPI aboard INTEGRAL
dc.typetext

Files

Collections

arXiv