Astroparticle Physics

Can radio galaxies be the origin of ultra-high energy cosmic rays ?

by Björn Eichmann (Ruhr-Universität Bochum)


Radio galaxies are since decades promising candidates as the sources of ultrahigh energy cosmic rays (UHECRs). In this talk I expose if the stringent constraints imposed by the dipole and quadropole anisotropies as well as the UHECR spectrum and composition allow that radio galaxies are the dominant extragalactic cosmic ray sources.

In order to calculate the UHECR flux emitted by individual radio galaxies, their properties are constrained by using information from the radio-CR correlation and a dynamical evolution model. In addition to the UHECR flux from individual, local sources, the diffuse flux emitted by the bulk of non-local radio galaxies based on their radio luminosity distribution is included. Analyzing the source parameters within a range around their expected properties, I finally present the configurations of local sources describing well the UHECR spectrum, composition and large-scale anisotropies.

Join the meeting here: Zoom link

Meeting ID: 921 1801 0804
Passcode: 68144845