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EP Seminar
Blazars - The extreme Active Galaxies
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Europe/Zurich
UNIVERSITE DE GENEVE Stückelberg Auditorium
UNIVERSITE DE GENEVE Stückelberg Auditorium
Description
Blazars mark the extreme end of the AGN (Active Galactic Nuclei) population. These galaxies are thought to host a supper massive black hole. Accretion onto this mass forms a disk of matter around the central engine. This process is accompanied by forming a jet perpendicular to the disk, which transports electrons and/or positrons at relativistic speed away from the black hole. In the case of Blazars we look directly into this jet. The interaction of the particles which form the jet and the magnetic field surrounding it, leads to synchrotron radiation, and photons are up-scattered by relativistic electrons in inverse Compton processes. This leads to the observed properties of these AGNs: high variability, strong polarisation, non-thermal emission, and a characteristic spectral energy distribution. The violent processes in the jet make Blazars observable up to the TeV domain. This talk will focus on the appearance of Blazars and especially what is observable at high energies.
Organiser(s): E. Cortina-Gil
Note: UNIVERSITE DE GENEVE Ecole de physique Département de physique nucléaire et corspusculaire 24, Quai Ernest-Ansermet 1211 GENEVE 4 TéL: (022) 702 62 73 Fax: (022) 781 21 92
Organiser(s): E. Cortina-Gil
Note: UNIVERSITE DE GENEVE Ecole de physique Département de physique nucléaire et corspusculaire 24, Quai Ernest-Ansermet 1211 GENEVE 4 TéL: (022) 702 62 73 Fax: (022) 781 21 92