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Abstract: The energy range encompassing the ankle of the cosmic ray energy spectrumprobably marks the exhaustion of the accelerating sources in our Galaxy, aswell as the end of the Galactic confinement. Furthermore, this is the regionwhere the extragalactic flux penetrates the interstellar medium and starts,progressively, to be dominant. Although at lower energies it is likely that an-average- population of supernova remnants can be defined to account for mostof the cosmic ray flux, this assumption is increasingly difficult to maintainas higher energies are considered. One possibility is that supernovas are stilla main contributor along the first branch of the ankle region, but that theacceleration is now coming from well localized regions with a characteristicinterstellar medium, or a sub-population of supernovas exploding in a peculiarcircumstellar environment. These possibilities are analyzed in the present workusing a two-dimensional diffusion model for cosmic ray propagation. Specialemphasis is given to the inner 200 pc of our Galaxy and to the spiral armstructure in relation with the Sun position inside the disk.



Autor: Cinzia De Donato 1, Gustavo Medina-Tanco 1 1 Dep. Altas Energias, Inst. de Ciencias Nucleares, Universidad Nacional Autonoma de M

Fuente: https://arxiv.org/



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