Local Referent: Sabir Ramazanov
Abstract:
It is widely believed that UHECRs of highest energies are of extra-Galactic origin, whereas the low-energy CRs flux should be mostly Galactic: the exact spectral location of the transition between the two is however unknown. I'll present a study for signatures that would be produced in the spectrum and sky distribution of UHECR by a population of Galactic sources of high-energy protons in the energy range around 1 EeV, i.e., around the diffusive-to-ballistic transition. There are two generic features which appear at this energy: a spectral dip and a peculiar anisotropy. A few percent admixture of the Galactic protons can in principle be detected by current UHECR experiments.