ausblenden:
Schlagwörter:
-
MPINP:
HESS - Abteilung Hofmann
Zusammenfassung:
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.
