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La simulation électronique de CELESTE : étude des biais et application à l'obsevation de la Nébuleuse de Crabe

Abstract : High energy astrophysics deals with the extreme processes of the Universe linked with the production of energetic particles (cosmic rays). The search of the sites of its acceleration led to the birth of a gamma ray astronomy. Inside our Galaxy, supernova remnants and pulsars attract most attention. Active galactic nuclei, especialy its blazar category, represent the dominant group of sources at cosmological distances.
Using Cerenkov technique ground-based observatories can detect gamma rays of GeV energies that are absorbed in the atmosphere after developing into an electromagnetic cascade. CELESTE project succeeded in lowering of the energy threshold to 30 GeV using a large collecting area of a former solar power plant Thémis (French Pyrenées). Study of the key elements of its implementation - the hybrid analog-logical trigger and high frequency sampling of the signal recorded for multiple places of the field - represent the essential part of this thesis. The code developed for the simulation of the electronic part of the experiment was thoroughly tested in the comparaison with real measurements. The uncertainties of the amplitude calibration and trigger timing translate into errors of energy threshold and effective area determinations. The possible sources of bias are studied at several points of the simulation chain. These considerations are applied to the results of Crab Nebula observations, first source detected by CELESTE in 2000.
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Submitted on : Tuesday, September 9, 2003 - 5:05:22 PM
Last modification on : Wednesday, September 23, 2020 - 4:32:42 AM
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  • HAL Id : tel-00003334, version 1




Münz Filip. La simulation électronique de CELESTE : étude des biais et application à l'obsevation de la Nébuleuse de Crabe. Cosmologie et astrophysique extra-galactique [astro-ph.CO]. Université Paris-Diderot - Paris VII, 2003. Français. ⟨tel-00003334⟩



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