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Issue A&A
Volume 447, Number 3, March I 2006
Page(s) 1175 - 1187
Section Instruments, observational techniques, and data processing
DOI http://dx.doi.org/10.1051/0004-6361:20042513



A&A 447, 1175-1187 (2006)
DOI: 10.1051/0004-6361:20042513

Imaging techniques for gamma-ray diffuse emission: application to INTEGRAL/SPI

M. Allain1, 2, 3 and J.-P. Roques2

1  Centre National d'Études Spatiales, Toulouse, France
    e-mail: marc.allain@fresnel.fr
2  CESR (CNRS/UPS), Observatoire Midi-Pyrénées, Toulouse, France
    e-mail: roques@cesr.fr
3  LAOMP (CNRS/UPS), Observatoire Midi-Pyrénées, Toulouse, France

(Received 9 December 2004 / Accepted 17 August 2005 )

Abstract
Diffuse imaging in the gamma-ray energy range is a challenging problem, since faint radiation is usually mixed with strong instrumental background components. This situation results in data sets that are not very informative, so they lead to non robust image reconstruction. In this paper, we used a Bayesian approach to produce sky-maps with high resolution features. This method is then compared with the standard Richardson-Lucy algorithm on the basis of mock data sets that were generated from the SPI/INTEGRAL in-flight model.


Key words: techniques: high angular resolution -- gamma-rays: observations -- methods: data analysis





© ESO 2006

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