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Naslov:Search for Anisotropy in the Ultra High Energy Cosmic Ray Spectrum using the Telescope Array Surface Detector
Avtorji:ID Abbasi, R.U. (Avtor)
ID Lundquist, Jon Paul (Avtor), et al.
Datoteke:.pdf 1707.04967.pdf (169,05 KB)
MD5: D2AB3EAEE9DAF6A1A2911FF8449FBF88
 
Jezik:Angleški jezik
Vrsta gradiva:Delo ni kategorizirano
Tipologija:1.25 - Drugi sestavni deli
Organizacija:UNG - Univerza v Novi Gorici
Opis:The Telescope Array (TA) experiment is located in the western desert of Utah, USA, and observes ultra high energy cosmic rays (UHECRs) in the Northern hemisphere. At the highest energies, E>10~EeV, the shape of cosmic ray energy spectrum may carry an imprint of the source density distribution along the line of sight different in different directions of the sky. In this study, we search for such directional variations in the shape of the energy spectrum using events observed with the Telescope Array's surface detector. We divide the TA field of view into two nearly equal-exposure regions: the "on-source" region which we define as ±30∘ of the supergalactic plane containing mostly nearby structures, and the complementary "off-source" region where the sources are further away on average. We compare the UHECR spectra in these regions by fitting them to the broken power law and comparing the resulting parameters. We find that the off-source spectrum has an earlier break at highest energies. The chance probability to obtain such or larger difference in statistically equivalent distributions is estimated as 6.2±1.1×10−4 (3.2σ) by a Monte-Carlo simulation. The observed difference in spectra is in a reasonable quantitative agreement with a simplified model that assumes that the UHECR sources trace the galaxy distribution from the 2MRS catalogue, primary particles are protons and the magnetic deflections can be neglected.
Ključne besede:cosmic radiation: UHE, detector: surface, cosmic radiation: spectrum, cosmic radiation: energy spectrum, deflection: magnetic, numerical calculations: Monte Carlo, anisotropy
Verzija publikacije:Preprint, delovna različica publikacije (nerecenzirana)
Leto izida:2017
Št. strani:17
Številčenje:1707.04967v3
PID:20.500.12556/RUNG-5154-32bcf13b-24a0-5b2b-d07d-776266619e28 Novo okno
COBISS.SI-ID:12841219 Novo okno
NUK URN:URN:SI:UNG:REP:PBVD0NXF
Datum objave v RUNG:27.04.2020
Število ogledov:4082
Število prenosov:103
Metapodatki:XML DC-XML DC-RDF
:
ABBASI, R.U. in LUNDQUIST, Jon Paul, 2017, Search for Anisotropy in the Ultra High Energy Cosmic Ray Spectrum using the Telescope Array Surface Detector. V : arXiv [na spletu]. Vol. 1707.04967v3. [Dostopano 7 april 2025]. Pridobljeno s: https://repozitorij.ung.si/IzpisGradiva.php?lang=slv&id=5154
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Gradivo je del revije

Naslov:arXiv
Leto izida:2017

Licence

Licenca:CC BY-NC-ND 4.0, Creative Commons Priznanje avtorstva-Nekomercialno-Brez predelav 4.0 Mednarodna
Povezava:http://creativecommons.org/licenses/by-nc-nd/4.0/deed.sl
Opis:Najbolj omejujoča licenca Creative Commons. Uporabniki lahko prenesejo in delijo delo v nekomercialne namene in ga ne smejo uporabiti za nobene druge namene.
Začetek licenciranja:27.04.2020

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