Astrophysical models to interpret the Pierre Auger Observatory data
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378271%3A_____%2F25%3A00640440" target="_blank" >RIV/68378271:_____/25:00640440 - isvavai.cz</a>
Alternative codes found
RIV/61989592:15310/25:73634806
Result on the web
<a href="https://pos.sissa.it/484/015/pdf" target="_blank" >https://pos.sissa.it/484/015/pdf</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.22323/1.484.0015" target="_blank" >10.22323/1.484.0015</a>
Alternative languages
Result language
angličtina
Original language name
Astrophysical models to interpret the Pierre Auger Observatory data
Original language description
The Pierre Auger Observatory has measured the spectrum of ultra-high-energy cosmic rays with unprecedented precision, as well as the distribution of the depths of the maximum of the shower development in the atmosphere, which provide a reliable estimator of the mass composition. The measurements above 1017.8eV can be interpreted assuming two populations of uniformly distributed sources, one with a soft spectrum dominating the flux below few EeV, and another one with a very hard spectrum dominating above that energy. When considering the presence of intense extragalactic magnetic fields between our Galaxy and the closest sources and a high-energy population with low spatial density, a magnetic horizon appears, suppressing the cosmic ray's flux at low-energies, which could explain the very hard spectrum observed at Earth. The distribution of arrival directions, which at energies above 32 EeV shows indications of a correlation with a population of starburst galaxies or the radio galaxy Centaurus A (Cen A), are also important to constrain the sources. It is shown that adding a fractional contribution from these sources of about 20% on top of an homogeneous background leads to an improvement of the model likelihood.
Czech name
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Czech description
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Classification
Type
D - Article in proceedings
CEP classification
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OECD FORD branch
10303 - Particles and field physics
Result continuities
Project
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2025
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Article name in the collection
Proceedings of Science
ISBN
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ISSN
1824-8039
e-ISSN
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Number of pages
8
Pages from-to
015
Publisher name
Sissa Medilab srl
Place of publication
Trieste
Event location
Malargüe
Event date
Nov 17, 2024
Type of event by nationality
WRD - Celosvětová akce
UT code for WoS article
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