Astrophysique à Haute Energie

The H.E.S.S. observatory in Namibia detected very high energy gamma rays coming from the plasma beams ("jets") of the microquasar SS 433, and located the exact location in them of one of the most efficient particle accelerators in the world. galaxy.
 
L’observatoire H.E.S.S. en Namibie a détecté des rayons gamma de très haute énergie provenant des faisceaux de plasma (« jets ») du microquasar SS 433, et localisé l’emplacement exact, dans ces derniers, de l’un des accélérateurs de particules les plus efficaces de la galaxie.
 
View of the WFEE demonstration model. ©Laboratoire APC
Vue du modèle de démonstration WFEE . © Laboratoire APC

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. 

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