Large Scale Distribution of Arrival Directions of Cosmic Rays Detected above $10^{18}$ eV at the Pierre Auger Observatory

Abreu, Pedro; Aglietta, Marco; Ahlers, Markus; Ahn, Eun-Joo; Albuquerque, Ivone; Allard, Denis; Allekotte, Ingomar; Allen, Jeff; Allison, Patrick; Almela, Alejandro

doi:10.1088/0067-0049/203/2/34

Large Scale Distribution of Arrival Directions of Cosmic Rays Detected above $10^{18}$ eV at the Pierre Auger Observatory

Pierre Auger

Collaboration

2012

20 pages

Published in:

Astrophys.J.Suppl. 203 (2012) 34

e-Print:

1210.3736 [astro-ph.HE]

DOI:

10.1088/0067-0049/203/2/34

Report number:

FERMILAB-PUB-12-563-AD-AE-CD-TD

Experiments:

AUGER

View in:

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reference search89 citations

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Abstract: (arXiv)

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 presented. This search is performed as a function of both declination and right ascension in several energy ranges above

10^{18}

eV, and reported in terms of dipolar and quadrupolar coefficients. Within the systematic uncertainties, no significant deviation from isotropy is revealed. Assuming that any cosmic ray anisotropy is dominated by dipole and quadrupole moments in this energy range, upper limits on their amplitudes are derived. These upper limits allow us to challenge an origin of cosmic rays above

10^{18}

eV from stationary galactic sources densely distributed in the galactic disk and emitting predominantly light particles in all directions.

Note:

41 pages, 12 figures

astroparticle physics
cosmic rays
cosmic radiation: anisotropy
galaxy
observatory
dipole
Auger
flux: angular distribution
expansion: multipole
flux: formula

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