S E M I N A R IDepartament d'Astronomia i Astrofísica
Universitat de València
Computation of X-ray light curves from blazar jets
Max-Planck Institut für Astrophysik, Garching, Alemanya
Seminari del departament d'Astronomia i Astrofísica
Dimarts 27 abril 2004
Blazars are one of the most intriguing astrophysical objects in the Universe. Despite of the more than three decades of observations (mainly in the radio band and, lately also in X- and gamma-rays) we know very little about the physics underlying their phenomenology and their actual origin. According to the standard model, blazars are relativistic jets powered by the accretion onto supermassive, galactic black holes which are almost seen head on. Their non-thermal, radio--to--gamma-ray emission displays, in the high-energy part of the spectra, light curves showing variable episodes of higher power (of the order of $1044,$erg/s). The origing of the variability is commonly attributed to the interaction of very dense shells which propagate at relativistic velocities. We have addressed this scenario by means of relativistic hydrodynamic simulations coupled to a suitable numerical tool that estimates the non-thermal (synchrotron) emission associated to the acceleration of particles in relativistic shocks.