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We use a multimessenger approach to constrain realistic mixed compositionmodels of ultrahigh energy cosmic ray sources using the latest cosmic ray,neutrino, and gamma-ray data. We build on the successfulUnger-Farrar-Anchordoqui 2015 (UFA15) model which explains the shape of thespectrum and its complex composition evolution via photodisintegration ofaccelerated nuclei in the photon field surrounding the source. We explore theconstraints which can currently be placed on the redshift evolution of sourcesand the temperature of the photon field surrounding the sources. We show that agood fit is obtained to all data either with a source which accelerates anarrow range of nuclear masses or a Milky Way-like mix of nuclear compositions,but in the latter case the nearest source should be 30-50 Mpc away from theMilky Way in order to fit observations from the Pierre Auger Observatory. Wealso ask whether the data allow for a subdominant purely protonic component atUHE in addition to the primary UFA15 mixed composition component. We find thatsuch a two-component model can significantly improve the fit to cosmic ray datawhile being compatible with current multimessenger data.

Progress towards characterizing ultrahigh energy cosmic ray sources