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A New Look at Image Reconstruction of COMPTEL 1.8 MeV Data

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arxiv astro-ph/9902283 v1 pith:VBYH3G7Q submitted 1999-02-19 astro-ph

A New Look at Image Reconstruction of COMPTEL 1.8 MeV Data

classification astro-ph
keywords dataimagecomptelmremreconstructionaccountsalgorithmapplication
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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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