S E M I N A R IDepartament d'Astronomia i Astrofísica
Universitat de València
Numerical simulations of radiation from blazar jets
Dr. Petar Mimica
Departament d'Astronomia i Astrofísica, Universitat de València
Seminari del departament d'Astronomia i Astrofísica
Dijous 18 maig 2006
Blazars are a class of AGN which exhibit a rapid variability at radio, infrared, visual and X-ray wavelengths. They are characterized by a non-thermal spectral continuum and a strong and rapidly varying polarization. Probable cause of the variability are collisions of the parts of the inner jet moving at different velocities, while the jet is oriented close to the line of sight. Results of relativistic hydrodynamic (RHD) and relativistictic magnetohydrodynamic (RMHD) simulations of collisions of dense shells within blazar jets are presented, as well as the synthetic light curves resulting from them. Basic characteristics of the dynamics and the efficiencies of two-shell collisions are shown, and differences between the RHD and the RMHD scenarios are discussed. Influence of the initial shell properties and the resulting light curves is studied, and an analytic model is outlined, which aids in interpreting the observed blazar flares.