Cosmogenic photons strongly constrain UHECR source models

Abstract

With the newest version of our Monte Carlo code for ultra-high-energy cosmic ray (UHECR) propagation, CRPropa 3, the flux of neutrinos and photons due to interactions of UHECRs with extragalactic background light can be predicted. Together with the recently updated data for the isotropic diffuse gamma-ray background (IGRB) by Fermi LAT, it is now possible to severely constrain UHECR source models. The evolution of the UHECR sources especially plays an important role in the determination of the expected secondary photon spectrum. Pure proton UHECR models are already strongly constrained, primarily by the highest energy bins of Fermi LAT's IGRB, as long as their number density is not strongly peaked at recent times.

4 pages, 6 figures, submitted to the Proceedings of the ARENA-2016 conference (Groningen, the Netherlands, June 7 - 10th 2016)

References in corpus (4)

• The spectrum of isotropic diffuse gamma-ray emission between 100 MeV and 820 GeV
• Cascade photons as test of protons in UHECR
• Implications of gamma-ray observations on proton models of UHECR
• On ultra high energy cosmic rays and their resultant gamma rays

Cited by in corpus (6)

• Cosmogenic photon and neutrino fluxes in the Auger era
• Determining the fraction of cosmic-ray protons at ultra-high energies with cosmogenic neutrinos
• AGN jets as the origin of UHECRs and perspectives for the detection of astrophysical source neutrinos at EeV energies
• Progress towards characterizing ultrahigh energy cosmic ray sources
• Cosmogenic Neutrinos Through the GRAND Lens Unveil the Nature of Cosmic Accelerators
• Current constraints from cosmogenic neutrinos on the fraction of protons in UHECRs