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Nébuleuses de pulsars : sondage profond de la Galaxie au TeV et études multi-longueurs d'onde.

Abstract : This thesis is dedicated to the study of Very High Energy gamma-ray sources discovered thanks to the H.E.S.S. telescopes . The H.E.S.S. observatory has indeed revealed, through a systematic survey of the galactic plane since 6 years, a very rich gamma-ray sky. First, we verified that the evolution of the telescope performance since the start of operations was well understood. The study of TeV characteristics, but also at other wavelengths, including X-rays, of pulsar wind nebulae is the central part of the work presented here. For sources whose nature remained unknown or subject to question, we searched for counterparts among the known pulsars, or made a spectral and morphological analysis, which helped to identify many as nebulae, except one for which we have shown that this scenario is rather uncomfortable through profound observations in X-rays. This source could thus constitute a new class of gamma-ray sources. Pulsar wind nebulae, are nevertheless, and this work will have contributed to this, by far the majority of the TeV sources in the Galaxy. We study them as such, by forming a catalogue, and then show that the sensitivity limitation of the TeV horizon forbids to consider it as complete. Finally, the search for relationships between the various observables at TeV gamma-rays and X-rays of the nebulae, and parameters of the pulsar, while providing a predictive tool, confirms the relic nature of many sources because of non-dependence of the gamma-ray luminosity on age or on the pulsar power.
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https://tel.archives-ouvertes.fr/tel-01251247
Contributor : Vincent Marandon Connect in order to contact the contributor
Submitted on : Tuesday, January 5, 2016 - 7:31:32 PM
Last modification on : Thursday, November 18, 2021 - 3:57:24 AM
Long-term archiving on: : Thursday, April 7, 2016 - 3:41:46 PM

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  • HAL Id : tel-01251247, version 1

Citation

Vincent Marandon. Nébuleuses de pulsars : sondage profond de la Galaxie au TeV et études multi-longueurs d'onde.. Phénomènes cosmiques de haute energie [astro-ph.HE]. Observatoire de Paris, 2010. Français. ⟨tel-01251247⟩

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