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Humboldt-Universität zu Berlin - Mathematisch-Naturwissen­schaft­liche Fakultät - Experimentelle Elementarteilchenphysik

Ekrem O Angüner (2016)

VHE and multi-wavelength data analysis of HESS J1741−302

PhD thesis, Humboldt Universität zu Berlin.

HESS J1741−302 is an unidentified very-high-energy (VHE) γ-ray source located in the Galactic Plane at about 1.7 ◦ away from the Galactic Center. It is one of the faintest TeV objects detected so far, with a flux Φ(>1 TeV) = (1.65 ± 0.28 stat ± 0.33 sys ) × 10 −13 cm −2 s −1 corresponding to ∼1% of the Crab Nebula flux at the same energies. The data analysis of an updated high-quality dataset of ∼145 hours of VHE H.E.S.S. data taken between 2004 and 2013 has revealed the morphology of HESS J1741−302. The γ-ray spectrum of HESS J1741−302 extends beyond 10 TeV without showing any clear evidence of a cut-off. The source spectrum is well described by a power-law model with a spectral index of Γ = 2.28 ± 0.16 stat ± 0.20 sys and a normalization at 1 TeV of Φ 0 = (2.12 ± 0.42 stat ± 0.42 sys ) × 10 −13 cm −2 s −1 TeV −1 . Different scenarios will be considered in this thesis, including the interaction of cosmic-ray protons with molecular clouds found along the line of sight, inverse Compton scattering of infra-red photons provided by a nearby OH/IR star and the presence of a nearby pulsar wind nebula possibly related to PSR B1737−30, in order to explain the observed VHE gamma-ray emission.