Astrophysique à Haute Energie

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. 

Dans les Iles Canaries de La Palma (Espagne), Cédric Champion, du service Electronique du laboratoire APC, assisté à distance par Michael Punch (physicien à APC), participe à la campagne d'intégration du prototype Large-Sized Telescope (LST) avec le Cherenkov Telescope Array Observatory (CTAO) Array Control and Data Acquisition System (ACADA).
 
Le LST a été mis en service en tant que télescope...
On the Canary island of La Palma (Spain), Cédric Champion, from APC Electronics, backed up remotely by Michael Punch (physicist at APC), are participating in the integration campaign of the prototype Large-Sized Telescope (LST) with the Cherenkov Telescope Array Observatory (CTAO) Array Control and Data Acquisition System (ACADA).
 
The LST has been in commissioning as a single Imaging Cherenkov...

Artist's impression of the Vela pulsar, in the centre, and its magnetosphere, whose edge is marked by the bright circle. The blue tracks travelling outwards represent the paths of accelerated particles. These produce gamma radiation along the arms of a rotating spiral by colliding with infrared photons emitted in the magnetosphere (in red). © Science Communication Lab for DESY
 

Scientists discover the highest energy gamma rays ever from a pulsar

The H.E.S.S. observatory records 20...

Vue d’artiste du pulsar de Vela, au centre, et sa magnétosphère, dont la périphérie est marquée par le cercle brillant. Les traces bleues émergeant vers l’extérieur illustrent les trajectoires des particules accélérées. Celles-ci produisent le rayonnement gamma le long des bras d’une spirale tournante, par collisions avec des photons infrarouges émis dans la magnétosphère (en rouge). © Science Communication Lab for DESY


Les astrophysiciens découvrent les rayons gamma les plus énergétiques jamais observés en provenance d’un pulsar...

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