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HESS and Fermi surveys of the galactic gamma-ray source population


Deil,  Christoph
Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society;

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Deil, C. (2011). HESS and Fermi surveys of the galactic gamma-ray source population. PhD Thesis, Ruprecht-Karls-Universität, Heidelberg.

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The High Energy Stereoscopic System (HESS) is an array of four imaging atmospheric Cherenkov telecopes, located in Namibia, observing the gamma-ray sky at energies > 100 GeV since 2004. For the first time HESS has surveyed the Galactic plane (approximately in the range GLON = -110 to +70 deg, GLAT = -3 to 3 deg) and detected a number of sources, each one a cosmic particle accelerator emitting gamma rays produced in interactions of the cosmic rays with ambient matter and radiation fields. In this thesis the full HESS Galactic plane survey dataset was used to derive significance and flux maps as well as a catalog of 62 sources containing their position, extension and spectrum. Several new methods for an improved and semi-automatic detection and analysis of all sources were developed. The Fermi Large Area Telescope (LAT) is a space-based gamma-ray telescope, continuously performing an all-sky survey above 100 MeV since June 2008. Based on two years of data in the energy range 100 MeV to 100 GeV the LAT collaboration has published a catalog of 1873 sources, 244 of which, mostly of Galactic origin, are located inside the HESS survey region. In this work allsky significance and flux maps and catalogs of 74 Fermi sources above 10 GeV and 42 sources above 100 GeV are derived and a preliminary comparison with the HESS data is presented. This work can serve as the basis for future detailed studies of the Galactic gamma-ray source population.