Astrophysique à Haute Energie

Maître de conférences : analyse des données et préparation des missions spatiales de haute énergie

La mission spatiale SVOM (Space-based multi-band astronomical Variable Objects Monitor https://www.svom.eu/) est une mission franco-chinoise consacrée à l’étude des sursauts gamma et des autres phénomènes célestes transitoires et variables de haute énergie. Elle sera lancée mi-2023. Le satellite comportera quatre instruments dont deux réalisés en France, le télescope X (0,1-10 keV) à petit champ MXT et le télescope X-durs/gamma mous (4-150 keV) à grand champ ECLAIRs basé sur un système à masque codé.

Gamma-ray observations of flaring blazars

Super-massive black holes are known to dwell at the center of galaxies. When accreting matter they are observed from Earth as active galactic nuclei (AGNs). In a minority of AGNs the accretion of matter onto the black-hole is associated with the ejection of a relativistic jet of plasma along the polar axis. 
When the black-hole's jet points right in the direction of the Earth, relativistic effects boost the emission and make these objects among the brightest in the Universe. This peculiar AGNs are called blazars. 

Superbulles .Crédits – Rayons X : NASA/CXC/U.Mich./S.Oey, IR : NASA/JPL, Optique : ESO/WFI/2.2-m

Search for high-energy cosmic neutrinos

The origin and nature of cosmic rays at very high energy (UHECRs) is a long-standing puzzle that is still not completely resolved after a century of theoretical and experimental efforts. Neutrinos can travel untouched from their source, thus indicating their locations. Neutrinos of cosmic origin are expected to be produced via the decay of charged pions and kaons, generated in hadronic interactions of cosmic rays with gas or radiation in their acceleration sites or during their propagation.

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