Naslov
Constraints on the origin of cosmic rays above 10^18 eV from large-scale anisotropy searches in data of the Pierre Auger Observatory

Autori
Abreu, P. ; ... ; Antičić, Tome ; ... ; Kadija, Krešo ; ... ; Mićanović, Saša ; ... ; Šuša, Tatjana ; ... ; Ziolkowski, M.

Izvornik
The Astrophysical Journal Letters (2041-8205) 762 (2012), 1; L13-1

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
astroparticle physics – cosmic rays

Sažetak
A thorough search for large-scale anisotropies in the distribution of arrival directions of cosmic rays detected above 10^18 eV at the Pierre Auger Observatory is reported. For the first time, these large-scale anisotropy searches are performed as a function of both the right ascension and the declination and expressed in terms of dipole and quadrupole moments.Within the systematic uncertainties, no significant deviation from isotropy is revealed. Upper limits on dipole and quadrupole amplitudes are derived under the hypothesis that any cosmic ray anisotropy is dominated by such moments in this energy range. These upper limits provide constraints on the production of cosmic rays above 10^18 eV, since they allow us to challenge an origin from stationary galactic sources densely distributed in the galactic disk and emitting predominantly light particles in all directions.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

POVEZANOST RADA