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“Distribution of arrival directions of Ultrahigh-energy cosmic rays composition” – Rita de Cassia dos Anjos (UFPR)
19 de maio: 14:30 - 16:00
Cosmic rays are accelerated to high energies, propagating with the speed of light and constantly reaching the Earth. However, we know very little about its sources; how they are accelerated, and the role they play in our galaxy and beyond. The Pierre Auger Observatory in Argentina recently reported a correlation between ultra-high cosmic rays (UHECRs) and Starburst galaxies and active galactic nuclei (AGN). Starburst galaxies are galaxies with high rates of star formation and are among the most luminous galaxies in the universe. Acceleration models, relativistic shocks, and UHECR propagation in powerful winds from Starburst galaxies have shown consistency with the observed cosmic ray spectrum. On the other hand, radio galaxies have very high power relativistic jets, indicating that these galaxies are large accelerating sites and some are close to our galaxy. In this lecture, I will discuss some characteristics of cosmic ray physics, their composition, and the effect of the galactic magnetic field on the trajectory of these particles. The results indicate that these galaxies are possible accelerating sites for UHECRs.