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Title:FR-0 jetted active galaxies : extending the zoo of candidate sites for UHECR acceleration
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:.pdf ICRC2021_986.pdf (1,13 MB)
MD5: F8BC7CC81C80544FA7B1328F80D94C26
 
Language:English
Work type:Unknown
Typology:1.08 - Published Scientific Conference Contribution
Organization:UNG - University of Nova Gorica
Abstract:Fanaroff-Riley (FR) 0 radio galaxies form a low-luminosity extension to the well-established ultra-high-energy cosmic-ray (UHECR) candidate accelerators FR-1 and FR-2 galaxies. Their much higher number density — up to a factor five times more numerous than FR-1 with z ≤ 0.05 — makes them good candidate sources for an isotropic contribution to the observed UHECR flux. Here, the acceleration and survival of UHECR in prevailing conditions of the FR-0 environment are discussed. First, an average spectral energy distribution (SED) is compiled based on the FR0CAT. These photon fields, composed of a jet and a host galaxy component, form a minimal target photon field for the UHECR, which will suffer from electromagnetic pair production, photo-disintegration, photo-meson production losses, and synchrotron radiation. The two most promising acceleration scenarios based on Fermi-I order and gradual shear acceleration are discussed as well as different escape scenarios. When an efficient acceleration mechanism precedes gradual shear acceleration, e.g., Fermi-I orothers, FR-0 galaxies are likely UHECR accelerators. Gradual shear acceleration requires a jet Lorentz factor of Gamma>1.6, to be faster than the corresponding escape. In less optimistic models, a contribution to the cosmic-ray flux between the knee and ankle is expected to be relatively independent of the realized turbulence and acceleration.
Keywords:jetted active galaxies, FR-0 radiogalaxies, ultra-high energy cosmic rays, cosmic ray acceleration, cosmic ray energy losses
Year of publishing:2021
Number of pages:str. 1-8
PID:20.500.12556/RUNG-6673 New window
COBISS.SI-ID:73062147 New window
UDC:539.1
ISSN on article:1824-8039
NUK URN:URN:SI:UNG:REP:QHH51HOF
Publication date in RUNG:16.08.2021
Views:3400
Downloads:5
Metadata:XML DC-XML DC-RDF
:
MERTEN, Lukas, BOUGHELILBA, Margot, REIMER, Anita, DA VELA, Paolo, VOROBIOV, Serguei, TAVECCHIO, Fabrizio, BONNOLI, Giacomo, LUNDQUIST, Jon Paul and RIGHI, Chiara, 2021, FR-0 jetted active galaxies : extending the zoo of candidate sites for UHECR acceleration. In : 37th International Cosmic Ray Conference [also] ICRC2021 [online]. Published Scientific Conference Contribution. 2021. p. 1–8. [Accessed 14 April 2025]. Retrieved from: https://repozitorij.ung.si/IzpisGradiva.php?lang=eng&id=6673
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Record is a part of a proceedings

Title:37th International Cosmic Ray Conference [also] ICRC2021
COBISS.SI-ID:69435907 New window

Record is a part of a journal

Title:Proceedings of science
Shortened title:Pos proc. sci.
Publisher:Sissa
ISSN:1824-8039
COBISS.SI-ID:20239655 New window

Document is financed by a project

Funder:ARRS - Slovenian Research Agency
Project number:N1-0111
Name:Identifikacija izvorov kozmičnih žarkov med aktivnimi galaksijami s curki

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License:CC BY-NC-ND 4.0, Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
Link:http://creativecommons.org/licenses/by-nc-nd/4.0/
Description:The most restrictive Creative Commons license. This only allows people to download and share the work for no commercial gain and for no other purposes.

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