Combined fit to the spectrum and composition data measured by the Pierre Auger Observatory including magnetic horizon effects

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378271%3A_____%2F24%3A00619666" target="_blank" >RIV/68378271:_____/24:00619666 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/61989592:15310/25:73633595

Výsledek na webu

<a href="https://pos.sissa.it/444/288/pdf" target="_blank" >https://pos.sissa.it/444/288/pdf</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.22323/1.444.0288" target="_blank" >10.22323/1.444.0288</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Combined fit to the spectrum and composition data measured by the Pierre Auger Observatory including magnetic horizon effects

Popis výsledku v původním jazyce

The measurements by the Pierre Auger Observatory of the energy spectrum and mass composition of cosmic rays can be interpreted assuming the presence of two extragalactic source populations, one dominating the flux at energies above a few EeV and the other below. To fit the data ignoring magnetic field effects, the high-energy population needs to accelerate a mixture of nuclei with very hard spectra, at odds with the approximate E−2 shape expected from diffusive shock acceleration. The presence of turbulent extragalactic magnetic fields in the region between the closest sources and the Earth can significantly modify the observed CR spectrum with respect to that emitted by the sources, reducing the flux of low-rigidity particles that reach the Earth. We here take into account this magnetic horizon effect in the combined fit of the spectrum and shower depth distributions, exploring the possibility that a spectrum for the high-energy population sources with a shape closer to E−2 be able to explain the observations. We find that a large inter-source separation ds and a large magnetic field RMS amplitude within the Local Supercluster region, such that Brms≃100nG(40Mpc/ds)25kpc/Lcoh, are needed to interpret the data within this scenario, where Lcoh is the magnetic field coherence length.n

Název v anglickém jazyce

Combined fit to the spectrum and composition data measured by the Pierre Auger Observatory including magnetic horizon effects

Popis výsledku anglicky

The measurements by the Pierre Auger Observatory of the energy spectrum and mass composition of cosmic rays can be interpreted assuming the presence of two extragalactic source populations, one dominating the flux at energies above a few EeV and the other below. To fit the data ignoring magnetic field effects, the high-energy population needs to accelerate a mixture of nuclei with very hard spectra, at odds with the approximate E−2 shape expected from diffusive shock acceleration. The presence of turbulent extragalactic magnetic fields in the region between the closest sources and the Earth can significantly modify the observed CR spectrum with respect to that emitted by the sources, reducing the flux of low-rigidity particles that reach the Earth. We here take into account this magnetic horizon effect in the combined fit of the spectrum and shower depth distributions, exploring the possibility that a spectrum for the high-energy population sources with a shape closer to E−2 be able to explain the observations. We find that a large inter-source separation ds and a large magnetic field RMS amplitude within the Local Supercluster region, such that Brms≃100nG(40Mpc/ds)25kpc/Lcoh, are needed to interpret the data within this scenario, where Lcoh is the magnetic field coherence length.n

Druh

D - Stať ve sborníku

CEP obor

—

OECD FORD obor

10303 - Particles and field physics

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2024

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název statě ve sborníku

Proceedings of Science

ISBN

—

ISSN

1824-8039

e-ISSN

—

Počet stran výsledku

13

Strana od-do

288

Název nakladatele

Sissa Medilab srl

Místo vydání

Trieste

Místo konání akce

Nagoya

Datum konání akce

26. 7. 2023

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

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