Tuesday, April 16, 2013

1304.3732 (D. Göring et al.)

Morphometric analysis in gamma-ray astronomy using Minkowski functionals - Source detection via structure quantification    [PDF]

D. Göring, M. A. Klatt, C. Stegmann, K. Mecke
Aims. H.E.S.S. observes an increasing number of large extended sources. A new technique based on the structure of the sky map is developed to account for these additional structures compared to the common point source analysis based on Li and Ma. Methods. Minkowski functionals are powerful measures from integral geometry. They can be used to quantify the structure of the counts map, which is then compared to the expected structure of a pure Poisson background. Gamma- ray sources lead to significant deviations from the expected background structure.The likelihood ratio method of Li and Ma is exclusively based on the number of excess counts and discards all further structure information of large extended sources. The morphometric data analysis incorporates this additional geometric information in an unbiased analysis, i.e. without the need of any prior knowledge about the source. Results. We have successfully applied our method to data of the H.E.S.S. experiment. The morphometric analysis presented here is especially designed for the detection of faint extended sources.
View original: http://arxiv.org/abs/1304.3732

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