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Towards the H.E.S.S. Galactic Plane Survey Gamma-Ray Source Catalog


Donath,  Axel
Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society;

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Donath, A. (2014). Towards the H.E.S.S. Galactic Plane Survey Gamma-Ray Source Catalog. Master Thesis, Ruprecht-Karls-Universität, Heidelberg.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0019-D531-F
This thesis deals with the creation of a catalog of Galactic gamma-ray sources using a multiscale detection and morphology characterisation method. The analysis is based on maps of the H.E.S.S. Galactic Plane Survey (HGPS), generated from observations between 2004 and 2013. The emission of the Galactic plane is modelled with a Likelihood-Fit procedure, assuming a Gaussian source morphology. The identified shell-type supernova remnants Vela Junior, HESS J1731-347 and RX J1713.7-3946 are excluded from the analysis. Applying a detection threshold of TS = 30 a total number of 112 source components is obtained. The existence of large, low surface brightness emission underneath known sources is revealed. The origin of this unresolved emission is not known. Furthermore it is observed, that bright extended sources decompose into multiple components, because the morphology assumption does not match the data well enough. First a reference catalog is defined, dealing with these issues by manually classifying and merging source components, using previous H.E.S.S. publications as guidance. A total number of 78 sources in the survey region is found. For all sources the position, extension and ux with uncertainties are determined. The brightness of the sources varies between 0:7% Crab and 80% Crab. The size of the source ranges between σ=0:006° and σ=0:64°. In a second step automatic methods are developed and examined to classify unresolved components by simple cuts in size and significance and to merge components into sources by defining a suitable overlap criterion. The reference catalog can be reproduced except for a few cases, which are discussed in detail.