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

Humboldt-Universität zu Berlin | Mathematisch-Naturwissen­schaft­liche Fakultät | Institut für Physik | Experimentelle Elementarteilchenphysik | H.E.S.S. | Theses | Identification of the VHE Gamma-ray source HESS J1303-631 as a pulsar wind nebula through multi-wavelength observations

Matthew L Dalton (2011)

Identification of the VHE Gamma-ray source HESS J1303-631 as a pulsar wind nebula through multi-wavelength observations

PhD thesis, Humboldt Universität zu Berlin.

This work represents the identification of the very high energy, E > 100 GeV (VHE), Gamma-ray source HESS J1303-631 as a pulsar wind nebula (PWN) powered by the pulsar PSR J1301-6305. This is achieved through the detection of energy dependent morphology in the High Energy Stereoscopic System (H.E.S.S.) data, the detection of a new X-ray PWN in archival XMM-Newton X-ray observations, as well as multi-wavelength modeling of the source and its energetics. An upper limit on the radio synchrotron flux is obtained from observations made by the Parkes telescope at 4.48 GHz. The combined Gamma-ray, X-ray and radio measurements are used to constrain a leptonic emission model, where strong winds of relativistic electrons and positrons from the pulsar power the acceleration of particles to ultrarelativistic energies at the wind termination shock region, and these shock accelerated leptons then form a nebula which emits in the X-ray and radio bands via synchrotron emission in the ambient magnetic field and Gamma-rays through the inverse Compton mechanism. One surprising result of this analysis is the anomalously low magnetic field derived for the PWN. Typical values for PWNe are on the order of 10 microgauss. For this source, however, the low synchrotron levels predict an average magnetic field of approximately 0.9 microgauss. The low magnetic field is explained in the scenario of an expanded/evolved PWN.