3-12 May 2019
Museum Casa de los Árabes
Cuba timezone

Cosmogenic photon and neutrino fluxes in the Auger era

6 May 2019, 15:30
Naviti Beach Club Varadero Hotel

Naviti Beach Club Varadero Hotel



Rogerio de Almeida (Universidade Federal Fluminense)


The interaction of ultra-high-energy cosmic rays (UHECRs) with pervasive photon fields generates associated cosmogenic fluxes of neutrinos and photons due to photohadronic and photonuclear processes taking place in the intergalactic medium. We perform a fit of the UHECR spectrum and composition measured by the Pierre Auger Observatory for four source emissivity scenarios: power-law redshift dependence with one free parameter, active galactic nuclei, gamma-ray bursts, and star formation history. We show that negative source emissivity evolution is favoured if we treat the source evolution as a free parameter. In all cases, the best fit is obtained for relatively hard spectral indices and low maximal rigidities, for compositions at injection dominated by intermediate nuclei (nitrogen and silicon groups). In light of these results, we calculate the associated fluxes of neutrinos and photons. Finally, we discuss the prospects for the future generation of high-energy neutrino and gamma-ray observatories to constrain the sources of UHECRs.

Primary authors

Rogerio de Almeida (Universidade Federal Fluminense) Rafael Alves Batista (Universidade de São Paulo) Kumiko Kotera (Institut d'Astrophysique de Paris) Bruno Lago (Centro Federal de Educacao Tecnologica Celso Suckow da Fonseca – Campus Nova Friburgo (CEFET/RJ – Campus Nova Friburgo), Nova Friburgo-RJ, Brazil)

Presentation Materials