Origin of the light cosmic ray component below the ankle

摘要: The origin and nature of the ultrahigh energy cosmic rays remains a mystery. However, considerable progress has been achieved in past years due to observations performed by Pierre Auger Observatory Telescope Array. Above $10^{18}$ eV observed spectrum presents two features: hardening slope at $\sim 10^{18.6}$ eV, which is known as ankle, suppression 10^{19.6}$ eV. composition inferred from experimental data, interpreted using current high hadronic interaction models, seems be light below showing trend heavier nuclei for increasing values primary energy. Also, anisotropy information consistent with an extragalactic this component that would dominate ankle. Therefore, models explain ankle transition galactic components are disfavored present data. Recently, it proposed originates photodisintegration more energetic source environment. formation can also explained mechanism. In work we study detail general scenario but context central region active galaxies. case, accelerated near supermassive black hole these types galaxies, heavy takes place radiation field surrounds hole.