Techniques for searching for anisotropy in the arrival directions of ultra-high energy cosmic rays

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378271%3A90232%2F25%3A00641985" target="_blank" >RIV/68378271:90232/25:00641985 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.1007/s13538-024-01640-6" target="_blank" >https://doi.org/10.1007/s13538-024-01640-6</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1007/s13538-024-01640-6" target="_blank" >10.1007/s13538-024-01640-6</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Techniques for searching for anisotropy in the arrival directions of ultra-high energy cosmic rays

Popis výsledku v původním jazyce

Understanding the origin and distribution of ultra-high-energy cosmic rays (UHECRs) remains a cornerstone challenge in astrophysics. These cosmic rays, with energies exceeding 8 EeV, provide insights into the most energetic phenomena in the universe. In this paper, we review and apply various statistical and analytical techniques to a simulated dataset to investigate the anisotropy in the arrival directions of UHECRs with energies exceeding 8 EeV. We simulate cosmic-ray events based on the distribution of local matter from the 2MASS Redshift Survey, supplemented with an isotropic background component, to create a robust dataset for analysis. Our methods include blind searches for excesses over the sky, Rayleigh analysis in right ascension, reconstruction of dipole and quadrupole moments using spherical harmonics, and the angular power spectrum technique — a method extensively utilized in cosmic microwave background studies — to assess anisotropies across multiple angular scales. The results underscore the potential of these methodologies to reveal significant anisotropies and contribute to our understanding of the possible extragalactic sources and propagation mechanisms of UHECRs.

Název v anglickém jazyce

Techniques for searching for anisotropy in the arrival directions of ultra-high energy cosmic rays

Popis výsledku anglicky

Understanding the origin and distribution of ultra-high-energy cosmic rays (UHECRs) remains a cornerstone challenge in astrophysics. These cosmic rays, with energies exceeding 8 EeV, provide insights into the most energetic phenomena in the universe. In this paper, we review and apply various statistical and analytical techniques to a simulated dataset to investigate the anisotropy in the arrival directions of UHECRs with energies exceeding 8 EeV. We simulate cosmic-ray events based on the distribution of local matter from the 2MASS Redshift Survey, supplemented with an isotropic background component, to create a robust dataset for analysis. Our methods include blind searches for excesses over the sky, Rayleigh analysis in right ascension, reconstruction of dipole and quadrupole moments using spherical harmonics, and the angular power spectrum technique — a method extensively utilized in cosmic microwave background studies — to assess anisotropies across multiple angular scales. The results underscore the potential of these methodologies to reveal significant anisotropies and contribute to our understanding of the possible extragalactic sources and propagation mechanisms of UHECRs.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10303 - Particles and field physics

Projekt

—

Návaznosti

—

Rok uplatnění

2025

Kód důvěrnosti údajů

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

Název periodika

Brazilian Journal of Physics

ISSN

0103-9733

e-ISSN

1678-4448

Svazek periodika

55

Číslo periodika v rámci svazku

1

Stát vydavatele periodika

BR - Brazilská federativní republika

Počet stran výsledku

8

Strana od-do

9

Kód UT WoS článku

001351523500001

EID výsledku v databázi Scopus

2-s2.0-85209821969