[SEMINARI] (sin asunto)

[rodrigo en ific.uv.es]

Numerical simulations of radiation from blazar jets
                                                                        
         Dr. Petar Mimica
Departament d'Astronomia i Astrofisica
Universitat de Valencia
                                                                        
          Lloc: Seminari del Departament
Dia: Dijous, 18 Maig 2006
Hora: 15:30
                                                                        
         ABSTRACT: 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 arediscussed. Influence of the initial shell properties and 
the resulting light
curves is studied, and an analytic model is outlined, which aids in 
interpretingthe observed blazar flares.

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