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Theses

De la recherche de matière noire à l'émission diffuse de rayons gamma dans l'expérience H.E.S.S.

Abstract : Very high energy gamma-ray astronomy (E > 30 GeV), that allows to probe non-thermal processes in the universe, is a rather young field of research. Up to now, most of the objects that have been observed are point-like or have small spatial extensions. However, the interaction of cosmic rays with the interstellar medium is expected to give rise to a diffuse emission at these energies. A preliminary study of the detectability of this diffuse component by the H.E.S.S. telescope array is presented. The latter has been operating since 2004 and detects the Cherenkov light from atmospheric showers that are generated by very high enery photons. The standard On-Off background subtraction method is investigated along with the influence of the sky background noise on the recorded event rate. A second theme covered by this thesis is that of the detectability of dark matter by the H.E.S.S. experiment. This is performed using CLUMPY, a semi-analytical code developed during this thesis. The CLUMPY code calculates the gamma-ray flux from dark matter annihilation from user-defined galactic structure and sub-structure distributions. The H.E.S.S. ~15 hour long observation of the Carina dwarf spheroidal galaxy has furthermore set an upper limit at 1e-22 cm3/s for the dark matter annihilation cross section.
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https://tel.archives-ouvertes.fr/tel-00553807
Contributor : Aldée Charbonnier <>
Submitted on : Sunday, January 9, 2011 - 7:32:15 PM
Last modification on : Monday, October 19, 2020 - 11:11:40 AM
Long-term archiving on: : Monday, April 11, 2011 - 6:06:46 PM

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  • HAL Id : tel-00553807, version 1

Citation

Aldée Charbonnier. De la recherche de matière noire à l'émission diffuse de rayons gamma dans l'expérience H.E.S.S.. Cosmologie et astrophysique extra-galactique [astro-ph.CO]. Université Pierre et Marie Curie - Paris VI, 2010. Français. ⟨tel-00553807⟩

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