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- W2471685078 abstract "The High Energy Stereoscopic System (H.E.S.S.) experiment is an array of five Imaging Atmospheric Cherenkov Telescopes (IACT) located in the Southern Hemisphere, whose primary goal is the study of cosmic gamma-rays in the few tens of GeV - tens of TeV energy range. The detection technique used by IACT as well as the specificities of the reconstruction method of H.E.S.S. I (first phase of the H.E.S.S. experiment) are fully described in this document. After more than ten years of activity, the H.E.S.S. experiment has registered a large amount of data. In addition to the regions of interest that its detectors probe and where astrophysical sources were unveiled, many events collected provide useful information on their surrounding environment. Indeed, acting as a background to the active sources, one can find the diffuse emissions, which are not well understood and yet are of significant interest for astrophysics, particle physics, cosmology and even physics beyond the standard model, such as the search for new particles in the framework of the study of the nature of dark matter. The diffuse emissions and their previous studies are presented in this document, as well as their possible origin, starting from the acceleration of cosmic-rays mechanism and the gamma-ray production in the active sources or from secondary process involving cosmic-rays interactions in the interstellar medium.In this work, tools to investigate the diffuse emissions were developed and implemented. The approach aims at disentangling the different components of the studied data so as to extract an estimation of their proportion and their weight in the spectrum. The method is based on probability density functions built with discriminant variables. The necessary preliminary study and treatment of the discriminant variables is also detailed. The resulting concentrations of each type of particle are presented, in addition to the first estimation of an upper limit on the extragalactic diffuse gamma-ray emission flux at TeV energies. A well known astrophysical source is used as benchmark for the analysis. Indeed, through the modelization of its reconstructed image and the subsequent estimation of its intensity, the developed method’s capability to disentangle particles can be evaluated. Lastly, two ways of reconstructing the diffuse electrons and hadrons spectra are explained and the results discussed." @default.
- W2471685078 created "2016-07-22" @default.
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- W2471685078 date "2013-01-01" @default.
- W2471685078 modified "2023-09-23" @default.
- W2471685078 title "Study of the diffuse emissions with the H.E.S.S. experiment" @default.
- W2471685078 hasPublicationYear "2013" @default.
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