Progress towards characterizing ultrahigh energy cosmic ray sources Article Swipe
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· 2019
· Open Access
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· DOI: https://doi.org/10.1103/physrevd.100.103008
· OA: W2952904459
We use a multimessenger approach to constrain realistic mixed composition\nmodels of ultrahigh energy cosmic ray sources using the latest cosmic ray,\nneutrino, and gamma-ray data. We build on the successful\nUnger-Farrar-Anchordoqui 2015 (UFA15) model which explains the shape of the\nspectrum and its complex composition evolution via photodisintegration of\naccelerated nuclei in the photon field surrounding the source. We explore the\nconstraints which can currently be placed on the redshift evolution of sources\nand the temperature of the photon field surrounding the sources. We show that a\ngood fit is obtained to all data either with a source which accelerates a\nnarrow range of nuclear masses or a Milky Way-like mix of nuclear compositions,\nbut in the latter case the nearest source should be 30-50 Mpc away from the\nMilky Way in order to fit observations from the Pierre Auger Observatory. We\nalso ask whether the data allow for a subdominant purely protonic component at\nUHE in addition to the primary UFA15 mixed composition component. We find that\nsuch a two-component model can significantly improve the fit to cosmic ray data\nwhile being compatible with current multimessenger data.\n
