On Ultra-High Rigidity Cosmic Rays

Lemoine, Martin

doi:10.7566/jpscp.19.011004

Cited by 3 publications

(1 citation statement)

References 18 publications

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“…would then need to address why we do not observe a strong anisotropy associated with protons at E/Z [11,12,13].…”

Section: Anisotropy On Intermediate Scalementioning

confidence: 99%

UHE Cosmic Rays And Agn Jets

Rieger¹

2020

Proceedings of High Energy Phenomena in Relativistic Outflows VII — PoS(HEPRO VII)

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Active Galactic Nuclei (AGN) and their relativistic jets are believed to be potential sites of ultrahigh-energy (UHE) cosmic ray acceleration. This paper reviews basic observational findings as well as requirements on source energetics, and then discusses the relevance of different acceleration sites and mechanisms, such as black hole gap, shock in back-flows or jet shear acceleration. When put in context, the result suggests that Fermi-type particle acceleration at trans-relativistic shocks and/or in shearing, relativistic flows offers the most promising framework for UHECR production in AGN. Truly deciphering the astrophysical sources of UHECRs, however, still needs improved statistical information on arrival directions and source correlations.

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“…would then need to address why we do not observe a strong anisotropy associated with protons at E/Z [11,12,13].…”

Section: Anisotropy On Intermediate Scalementioning

confidence: 99%

UHE Cosmic Rays And Agn Jets

Rieger¹

2020

Proceedings of High Energy Phenomena in Relativistic Outflows VII — PoS(HEPRO VII)

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Particle acceleration in astrophysical jets

Matthews

Bell

Blundell

2020

New Astronomy Reviews

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Active Galactic Nuclei as Potential Sources of Ultra-High Energy Cosmic Rays

Rieger

2022

Universe

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Active Galactic Nuclei (AGNs) and their relativistic jets belong to the most promising class of ultra-high-energy cosmic ray (UHECR) accelerators. This compact review summarises basic experimental findings by recent instruments, and discusses possible interpretations and astrophysical constraints on source energetics. Particular attention is given to potential sites and mechanisms of UHECR acceleration in AGNs, including gap-type particle acceleration close to the black hole, as well as first-order Fermi acceleration at trans-relativistic shocks and stochastic shear particle acceleration in large-scale jets. It is argued that the last two represent the most promising mechanisms given our current understanding, and that nearby FR I type radio galaxies provide a suitable environment for UHECR acceleration.

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On Ultra-High Rigidity Cosmic Rays

Cited by 3 publications

References 18 publications

UHE Cosmic Rays And Agn Jets

UHE Cosmic Rays And Agn Jets

Particle acceleration in astrophysical jets

Active Galactic Nuclei as Potential Sources of Ultra-High Energy Cosmic Rays

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