Ultra-High-Energy Cosmic Rays from Radio Galaxies
TLDR
In this paper, the authors present a first systematic approach that takes the individual characteristics of these sources into account, as well as the impact of the extragalactic magnetic-field structures up to a distance of 120 Mpc.Abstract:
Radio galaxies are intensively discussed as the sources of cosmic rays observed above about $3\,{\times}\,10^{18}\,\text{eV}$, called ultra-high energy cosmic rays (UHECRs). We present a first, systematic approach that takes the individual characteristics of these sources into account, as well as the impact of the extragalactic magnetic-field structures up to a distance of 120 Mpc. We use a mixed simulation setup, based on 3D simulations of UHECRs ejected by observed, individual radio galaxies taken out to a distance of 120 Mpc, and on 1D simulations over a continuous source distribution contributing from beyond 120 Mpc. Additionally, we include the ultra-luminous radio galaxy Cygnus A at a distance of about $250\,$Mpc, as its contribution is so strong that it must be considered as an individual point source. The implementation of the UHECR ejection in our simulation setup is based on a detailed consideration of the physics of radio jets and standard first-order Fermi acceleration. We show that the average contribution of radio galaxies taken over a very large volume cannot explain the observed features of UHECRs measured at Earth. However, we obtain excellent agreement with the spectrum, composition, and arrival-direction distribution of UHECRs measured by the Pierre Auger Observatory, if we assume that most UHECRs observed arise from only two sources: The ultra-luminous radio galaxy Cygnus A, providing a mostly light composition of nuclear species dominating up to about $6\,{\times}\,10^{19}\,$eV, and the nearest radio galaxy Centaurus A, providing a heavy composition dominating above $6\,{\times}\,10^{19}\,$eV. Here we have to assume that extragalactic magnetic fields out to 250 Mpc, which we did not include in the simulation, are able to isotropize the UHECR events at about 8 EeV arriving from Cygnus A.read more
Citations
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Journal ArticleDOI
Open questions in cosmic-ray research at ultrahigh energies
Rafael Alves Batista,Jonathan Biteau,Mauricio Bustamante,Klaus Dolag,Klaus Dolag,Ralph Engel,Ke Fang,Karl-Heinz Kampert,Dmitriy Kostunin,Miguel Mostafá,Kohta Murase,Kohta Murase,Foteini Oikonomou,Angela V. Olinto,Mikhail Panasyuk,Guenter Sigl,Andrew M. Taylor,Michael Unger +17 more
TL;DR: In this paper, the authors review open questions and prospects for progress in ultra-high-energy cosmic ray (UHECR) research, based on a series of discussions that took place during the MIAPP workshop in 2018.
Journal ArticleDOI
Cosmogenic photon and neutrino fluxes in the Auger era
TL;DR: In this article, the authors performed 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.
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Cluster Accretion Shocks as Possible Acceleration Sites for Ultra High Energy Protons below the Greisen Cutoff
TL;DR: In this paper, it was shown that protons can be accelerated up to the Greisen cutoff energy near $6\times 10^{19}$ eV, provided the mean magnetic field strength in the region around the shocks is at least of order a microgauss.
Journal ArticleDOI
Open Questions in Cosmic-Ray Research at Ultrahigh Energies
Rafael Alves Batista,Jonathan Biteau,Mauricio Bustamante,Klaus Dolag,Ralph Engel,Ke Fang,Karl-Heinz Kampert,Dmitriy Kostunin,Miguel Mostafá,Kohta Murase,Günter Sigl,Foteini Oikonomou,Angela V. Olinto,Mikhail Panasyuk,Andrew M. Taylor,Michael Unger +15 more
TL;DR: In this paper, the authors review open questions and prospects for progress in ultra-high-energy cosmic ray (UHECR) research, based on a series of discussions that took place during the ''The High-Energy Universe: Gamma-Ray, Neutrino and Cosmic-ray Astronomy' MIAPP workshop in 2018.
Proceedings ArticleDOI
POEMMA: Probe Of Extreme Multi-Messenger Astrophysics
Angela V. Olinto,James H. Adams,Roberto Aloisio,Luis A. Anchordoqui,Douglas Bergman,M. E. Bertaina,P. Bertone,Mauricio Bustamante,M. J. Christl,S. Csorna,Johannes Eser,Francesco Fenu,Claire Guépin,Elizabeth Hays,Stanley D. Hunter,Eleanor Judd,Insoo Jun,Kumiko Kotera,John Krizmanic,E. Kuznetsov,S. Mackovjak,L. M. Martinez-Sierra,M. Mastafa,John N. Matthews,J. McEnery,John Mitchell,A. Neronov,A. N. Otte,Etienne Parizot,T. Paul,Jeremy S. Perkins,G. Prévôt,Patrick J. Reardon,Mary Hall Reno,F. Sarazin,Kenji Shinozaki,Floyd W. Stecker,R. E. Streitmatter,Tonia M. Venters,Lawrence Wiencke,Roy Young +40 more
TL;DR: The Probe Of Extreme Multi-Messenger Astrophysics (POEMMA) mission is being designed to establish charged particle astronomy with ultra-high energy cosmic rays (UHECRs) and to observe cosmogenic tau neutrinos (CTNs) as discussed by the authors.
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