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

Result code in 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>

Alternative codes found

RIV/61989592:15310/25:73633595

Result on the web

<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>

Result language

angličtina

Original language name

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

Original language description

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

Czech name

—

Czech description

—

Type

D - Article in proceedings

CEP classification

—

OECD FORD branch

10303 - Particles and field physics

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

Publication year

2024

Confidentiality

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

Article name in the collection

Proceedings of Science

ISBN

—

ISSN

1824-8039

e-ISSN

—

Number of pages

13

Pages from-to

288

Publisher name

Sissa Medilab srl

Place of publication

Trieste

Event location

Nagoya

Event date

Jul 26, 2023

Type of event by nationality

WRD - Celosvětová akce

UT code for WoS article

—