Anisotropy and chemical composition of ultra-high energy cosmic rays using arrival directions measured by the Pierre Auger Observatory
Jun, 201115 pages
Published in:
- JCAP 06 (2011) 022
e-Print:
- 1106.3048 [astro-ph.HE]
Report number:
- FERMILAB-PUB-11-281-AD-AE-CD-TD
Experiments:
Citations per year
Abstract: (arXiv)
The Pierre Auger Collaboration has reported evidence for anisotropy in the distribution of arrival directions of the cosmic rays with energies 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 are heavy nuclei with charge , the proton component of the sources should lead to excesses in the same regions at energies . We here report the lack of anisotropies in these directions at energies above (for illustrative values of ). If the anisotropies above are due to nuclei with charge , and under reasonable assumptions about the acceleration process, these observations imply stringent constraints on the allowed proton fraction at the lower energies.- cosmic radiation: UHE
- nucleus: heavy
- cosmic radiation: particle identification
- p: cosmic radiation
- angular distribution
- Auger
- correlation
- cosmic radiation: energy
- cosmic radiation: acceleration
- cosmic radiation: hadronic component
References(11)
Figures(6)