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Title:Impact of the magnetic horizon on the interpretation of the Pierre Auger Observatory spectrum and composition data
Authors:ID Abdul Halim, A. (Author)
ID Filipčič, Andrej (Author)
ID Lundquist, Jon Paul (Author)
ID Shivashankara, Shima Ujjani (Author)
ID Stanič, Samo (Author)
ID Vorobiov, Serguei (Author)
ID Zavrtanik, Danilo (Author)
ID Zavrtanik, Marko (Author), et al.
Files:URL https://iopscience.iop.org/article/10.1088/1475-7516/2024/07/094
 
.pdf Abdul_Halim_2024_J._Cosmol._Astropart._Phys._2024_094.pdf (3,65 MB)
MD5: AFE45E8DBE87D8FF84B68D00BD12DC17
 
URL https://iopscience.iop.org/article/10.1088/1475-7516/2024/07/094
 
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Language:English
Work type:Unknown
Typology:1.01 - Original Scientific Article
Organization:UNG - University of Nova Gorica
Abstract:The flux of ultra-high energy cosmic rays reaching Earth above the ankle energy (5 EeV) can be described as a mixture of nuclei injected by extragalactic sources with very hard spectra and a low rigidity cutoff. Extragalactic magnetic fields existing between the Earth and the closest sources can affect the observed CR spectrum by reducing the flux of low-rigidity particles reaching Earth. We perform a combined fit of the spectrum and distributions of depth of shower maximum measured with the Pierre Auger Observatory including the effect of this magnetic horizon in the propagation of UHECRs in the intergalactic space. We find that, within a specific range of the various experimental and phenomenological systematics, the magnetic horizon effect can be relevant for turbulent magnetic field strengths in the local neighbourhood in which the closest sources lie of order Brms ≃ (50–100) nG (20 Mpc/ds)( 100 kpc/Lcoh)1/2, with ds the typical intersource separation and Lcoh the magnetic field coherence length. When this is the case, the inferred slope of the source spectrum becomes softer and can be closer to the expectations of diffusive shock acceleration, i.e., ∝ E-2. An additional cosmic-ray population with higher source density and softer spectra, presumably also extragalactic and dominating the cosmic-ray flux at EeV energies, is also required to reproduce the overall spectrum and composition results for all energies down to 0.6 EeV.
Keywords:ultra high energy cosmic rays, UHECR propagation, magnetic horizon effect, Pierre Auger Observatory
Publication status:Published
Publication version:Version of Record
Publication date:01.07.2024
Year of publishing:2024
Number of pages:str. 1-30
Numbering:Vol. 2024, no. 7, [article no.] 094
PID:20.500.12556/RUNG-9343 New window
COBISS.SI-ID:208725507 New window
UDC:52
ISSN on article:1475-7516
eISSN:1475-7516
DOI:10.1088/1475-7516/2024/07/094 New window
NUK URN:URN:SI:UNG:REP:CA5JTV2R
Publication date in RUNG:24.09.2024
Views:81
Downloads:0
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Record is a part of a journal

Title:Journal of cosmology and astroparticle physics
Publisher:Institute of Physics Pub.
ISSN:1475-7516
COBISS.SI-ID:389627 New window

Document is financed by a project

Funder:ARIS - Slovenian Research and Innovation Agency
Project number:P1-0031
Name:Večglasniška astrofizika
Funder:ARIS - Slovenian Research and Innovation Agency
Project number:P1-0385
Name:Daljinsko zaznavanje atmosferskih lastnosti
Funder:ARIS - Slovenian Research and Innovation Agency
Project number:I0-0033
Name:Infrastrukturni program Univerze v Novi Gorici
Funder:ARIS - Slovenian Research and Innovation Agency
Project number:N1-0111
Name:Identifikacija izvorov kozmičnih žarkov med aktivnimi galaksijami s curki

Licences

License:CC BY 4.0, Creative Commons Attribution 4.0 International
Link:http://creativecommons.org/licenses/by/4.0/
Description:This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.
Licensing start date:31.07.2024
License:Other
Description:https://iopscience.iop.org/info/page/text-and-data-mining
Licensing start date:31.07.2024

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