Abstract
We present a novel approach to search for origins of ultra-high energy cosmic rays. In a simultaneous fit to all observed cosmic rays we use the galactic magnetic field as a mass spectrometer and adapt the nuclear charges such that their extragalactic arrival directions are concentrated in as few directions as possible. During the fit the nuclear charges are constraint by the individual energy and shower depth measurements. We show in a simulated astrophysical scenario that source directions can be reconstructed even within a substantial isotropic background.
Highlights
Finding the sources of the ultra-high energy cosmic rays (UHECRs) is one of the fundamental questions in astroparticle physics and up to now still an unresolved puzzle
These models contain a large scale field component that leads to a coherent deflection of UHECRs, proportional to the inverse of the magnetic rigidity R = E/Z with the energy E and the nuclear charge Z of the UHECR candidate
We present a new combined fit method to contract origins of ultra-high energy cosmic rays by varying their charge while keeping them consistent with shower depth maximum measurements
Summary
Finding the sources of the ultra-high energy cosmic rays (UHECRs) is one of the fundamental questions in astroparticle physics and up to now still an unresolved puzzle. During the last years the knowledge about the galactic magnetic field is constantly increasing and there are models which were fitted to numerous rotation measurements and synchrotron radiation data [3,4,5]. These models contain a large scale field component that leads to a coherent deflection of UHECRs, proportional to the inverse of the magnetic rigidity R = E/Z with the energy E and the nuclear charge Z of the UHECR candidate. A method which only considers the cosmic ray energies without accounting for nuclear charges will not find the pattern anymore
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