Active galactic nuclei as potential sources of ultra-high energy cosmic rays
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...
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
17 November 2022
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| In: |
Universe
Year: 2022, Volume: 8, Issue: 11, Pages: 1-26 |
| ISSN: | 2218-1997 |
| DOI: | 10.3390/universe8110607 |
| Online Access: | Verlag, lizenzpflichtig, Volltext: https://doi.org/10.3390/universe8110607 Verlag, lizenzpflichtig, Volltext: https://www.mdpi.com/2218-1997/8/11/607 
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| Author Notes: | by Frank M. Rieger |
| Summary: | 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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| Item Description: | Gesehen am 13.02.2023 |
| Physical Description: | Online Resource |
| ISSN: | 2218-1997 |
| DOI: | 10.3390/universe8110607 |