UHECR propagation from Centaurus A

Abstract In the light of the recently predicted isotopic composition of the kpc-scale jet in Centaurus A, we re-investigate whether this source could be responsible for some of the ultra-high energy cosmic rays detected by the Pierre Auger Observatory. We find that a nearby source like Centaurus A is well motivated by the composition and spectral shape, and that such sources should start to dominate the flux above ∼ 4 EeV. The best-fitting isotopes from our modelling, with the maximum 56 Fe energy fixed at 250 EeV, are of intermediate mass, 12 C to 16 O, while the best-fitting particle index is 2.3.