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Premières détections de nébuleuses avec le Fermi-Large Area Telescope et étude de leurs pulsars

Abstract : The Fermi Gamma-ray Space Telescope was launched on 2008 June 11, carrying the Large Area Telescope (LAT), sensitive to gamma-rays in the 20 MeV – 300 GeV energy range. The Crab Nebula had been detected and studied in the 70 MeV – 30 GeV band using the CGRO-EGRET experiment, but no pulsar wind nebula (PWN) had ever been firmly identified in the high energy gamma-ray domain. PWNe are powered by the constant injection of a relativistic wind of electrons and positrons from their central pulsars. These charged particles are accelerated at the shock front forming the PWN and emit photons which can be observed along the entire electromagnetic spectrum, including the high energy gamma-ray domain. Data provided by the Fermi-LAT during the first two years of the mission have allowed the detection and the identification of three PWNe and their associated pulsars (Crab Nebula, Vela X and MSH 15-52) as well as the PWN HESS J1825-137 discovered by ground-based experiments sensitive to very high energy gamma-rays. Results of temporal, spectral and morphological analyses of the pulsar/PWN systems detected by Fermi-LAT, as well as results of systematic studies performed (i) around every gamma-ray pulsar detected by the LAT and (ii) around every very high energy source identified as a PWN or a PWN candidate are presented in this dissertation. These studies bring new insights and constraints on the physical properties of the sources as well as on emitting processes in pulsar magnetospheres and in PWNe.
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Contributor : Marie-Hélène Grondin <>
Submitted on : Wednesday, December 15, 2010 - 12:17:57 PM
Last modification on : Thursday, January 11, 2018 - 6:12:51 AM
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  • HAL Id : tel-00546994, version 1



Marie-Hélène Grondin. Premières détections de nébuleuses avec le Fermi-Large Area Telescope et étude de leurs pulsars. Astrophysique [astro-ph]. Université Sciences et Technologies - Bordeaux I, 2010. Français. ⟨tel-00546994⟩



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