Cosmic ray propagation to and from the Perseus-Pisces Supercluster

Ultra-High Energy Cosmic Rays (UHECRs) are the most energetic signals we have ever detected, yet a source has still not been identified. The Telescope Array Collaboration has reported that there is the potential for an UHECR source in the Perseus-Pisces Supercluster (PPSC) based on an analysis that revealed an excess of events at energies greater than 10^19.4 eV in the direction of the PPSC. However, these results do not account for compositions that are not primarily composed of protons. For a given energy, cosmic rays with higher atomic number can appear to come from the PPSC despite having been deflected along their journey from their true source to Earth, artificially inflating any excesses that appear to originate in the PPSC. Here, we investigate how cosmic rays of varying composition can introduce potential new source directions while appearing to come from the PPSC. Sky maps are produced first via backpropagation from Earth initially towards the PPSC and then from the newly inferred source directions forward to Earth to explore possible alternative regions of interest.