6533b851fe1ef96bd12a97d9
RESEARCH PRODUCT
Anisotropy and chemical composition of ultra-high energy cosmic rays using arrival directions measured by the Pierre Auger Observatory
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ACTIVE GALACTIC NUCLEI[PHYS.ASTR.HE]Physics [physics]/Astrophysics [astro-ph]/High Energy Astrophysical Phenomena [astro-ph.HE]ProtonAstronomyAstrophysics::High Energy Astrophysical PhenomenaFOS: Physical sciencescosmic ray experimentAcceleration (differential geometry)Cosmic rayultra high energy cosmic rays; cosmic ray experimentsultra high energy cosmic rays7. Clean energy01 natural sciencesultra high energy cosmic rayAugerNuclear physics0103 physical sciencesUltra-high-energy cosmic ray010306 general physicsAnisotropyNuclear ExperimentDETECTORHigh Energy Astrophysical Phenomena (astro-ph.HE)PhysicsPierre Auger ObservatorySPECTRUM010308 nuclear & particles physicsPhysics[SDU.ASTR.HE]Sciences of the Universe [physics]/Astrophysics [astro-ph]/High Energy Astrophysical Phenomena [astro-ph.HE]FísicaCharge (physics)Astronomy and Astrophysics13. Climate actionExperimental High Energy PhysicsComputingMethodologies_DOCUMENTANDTEXTPROCESSINGFísica nuclearcosmic ray experimentsAstrophysics - High Energy Astrophysical Phenomenadescription
The Pierre Auger Collaboration has reported evidence for anisotropy in the distribution of arrival directions of the cosmic rays with energies $E>E_{th}=5.5\times 10^{19}$ eV. These show a correlation with the distribution of nearby extragalactic objects, including an apparent excess around the direction of Centaurus A. If the particles responsible for these excesses at $E>E_{th}$ are heavy nuclei with charge $Z$, the proton component of the sources should lead to excesses in the same regions at energies $E/Z$. We here report the lack of anisotropies in these directions at energies above $E_{th}/Z$ (for illustrative values of $Z=6,\ 13,\ 26$). If the anisotropies above $E_{th}$ are due to nuclei with charge $Z$, and under reasonable assumptions about the acceleration process, these observations imply stringent constraints on the allowed proton fraction at the lower energies.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2011-06-01 | Journal of Cosmology and Astroparticle Physics |