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Title:Scrutinizing FR 0 radio galaxies as ultra-high-energy cosmic ray source candidates
Authors:ID Merten, Lukas (Author)
ID Boughelilba, Margot (Author)
ID Reimer, Anita (Author)
ID Da Vela, Paolo (Author)
ID Vorobiov, Serguei (Author)
ID Tavecchio, Fabrizio (Author)
ID Bonnoli, Giacomo (Author)
ID Lundquist, Jon Paul (Author)
ID Righi, Chiara (Author)
Files: This document has no files that are freely available to the public. This document may have a physical copy in the library of the organization, check the status via COBISS. Link is opened in a new window
Work type:Unknown
Typology:1.01 - Original Scientific Article
Organization:UNG - University of Nova Gorica
Abstract:Fanaroff-Riley (FR) 0 radio galaxies compose a new class of radio galaxies, which are usually weaker but much more numerous than the well-established class of FR 1 and FR 2 galaxies. The latter classes have been proposed as sources of the ultra-high-energy cosmic rays (UHECRs) with energies reaching up to eV. Based on this conjecture, the possibility of UHECR acceleration and survival in an FR 0 source environment is examined in this work. In doing so, an average spectral energy distribution (SED) based on data from the FR 0 catalog (FR0CAT) is compiled. The resulting photon fields are used as targets for UHECRs, which suffer from electromagnetic pair production, photo-disintegration, photo-meson production losses, and synchrotron radiation. Multiple mechanisms are discussed to assess the UHECR acceleration probability, including Fermi-I order and gradual shear accelerations, and particle escape from the source region. This work shows that in a hybrid scenario, combining Fermi and shear accelerations, FR 0 galaxies can contribute to the observed UHECR flux, as long as where shear acceleration starts to dominate over escape. Even in less optimistic scenarios, FR 0s can be expected to contribute to the cosmic-ray flux between the knee and the ankle. Our results are relatively robust with respect to the realized magnetic turbulence model and the speed of the accelerating shocks.
Keywords:acceleration of particles, nonthermal radiation mechanisms, jets, active galaxies, cosmic rays
Year of publishing:2021
Number of pages:str. 1-48
Numbering:Vol. , 1
PID:20.500.12556/RUNG-6250 New window
COBISS.SI-ID:50457091 New window
ISSN on article:0927-6505
DOI:10.1016/j.astropartphys.2021.102564 New window
Publication date in RUNG:05.02.2021
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Record is a part of a journal

Title:Astroparticle Physics
Shortened title:Astropart. phys.
COBISS.SI-ID:67323 New window

Document is financed by a project

Funder:ARRS - Slovenian Research Agency
Project number:N1-0111
Name:Identification of cosmic ray sources amongst jetted active galaxies