# UHECR propagation from Centaurus A

## TL;DR

This paper investigates whether Centaurus A could be a source of ultra-high energy cosmic rays, considering recent predictions about its jet composition, and finds it likely dominates above 4 EeV with intermediate-mass isotopes fitting best.

## Contribution

It introduces a model linking Centaurus A's jet composition to UHECR observations, highlighting its potential as a dominant nearby source above 4 EeV.

## Key findings

- Centaurus A could be responsible for some UHECRs detected.
- Intermediate-mass isotopes (12C to 16O) fit the data best.
- Source spectral index is approximately 2.3.

## 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 56Fe energy fixed at 250 EeV, are of intermediate mass, 12C to 16O, while the best-fitting particle index is 2.3.