A New Look at Image Reconstruction of COMPTEL 1.8 MeV Data

Details A New Look at Image Reconstruction of COMPTEL 1.8 MeV Data A New Look at Image Reconstruction of COMPTEL 1.8 MeV Data

1999-02-19

arxiv.org/abs/astro-ph/9902283v1

Astronomy and Astrophysics

Astrophysics

4 pages, 1 figure, Proc. of the 3rd INTEGRAL workshop, Taormina

Scientific paper

Deconvolving COMPTEL gamma-ray data into images presents a major methodological challenge. We developed a new algorithm called Multiresolution Regularized Expectation Maximization (MREM), which explicitly accounts for spatial correlations in the image by using wavelets (Dixon et al. 1998). We demonstrate that MREM largely suppresses image noise in the reconstruction, showing only significant structures that are present in the data. Application to 1.8 MeV data results in a sky map that is much smoother than the maximum entropy reconstructions presented previously, but it shows the same characteristic emission features which have been established earlier.

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