Anisotropy and chemical composition of ultra-high energy cosmic rays using arrival directions measured by the Pierre Auger Observatory
Abstract
The Pierre Auger Collaboration has reported evidence for anisotropy in the distribution of arrival directions of the cosmic rays with energies E > Eth = 5.5 x 1019 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 > Eth 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 Eth/Z (for illustrative values of Z = 6,13,26). If the anisotropies above Eth 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.
- Authors:
-
- et al.
- Publication Date:
- Research Org.:
- Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC)
- Contributing Org.:
- The Pierre Auger Collaboration
- OSTI Identifier:
- 1022794
- Report Number(s):
- FERMILAB-PUB-11-281-AD-AE-CD-TD
Journal ID: ISSN 1475-7516; arXiv eprint number arXiv:1106.3048; TRN: US1104153
- Grant/Contract Number:
- AC02-07CH11359
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of Cosmology and Astroparticle Physics
- Additional Journal Information:
- Journal Volume: 2011; Journal Issue: 6; Journal ID: ISSN 1475-7516
- Publisher:
- Institute of Physics (IOP)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ACCELERATION; ANISOTROPY; CHEMICAL COMPOSITION; DISTRIBUTION; HEAVY NUCLEI; NUCLEI; PROTONS
Citation Formats
Abreu, P. Anisotropy and chemical composition of ultra-high energy cosmic rays using arrival directions measured by the Pierre Auger Observatory. United States: N. p., 2011.
Web. doi:10.1088/1475-7516/2011/06/022.
Abreu, P. Anisotropy and chemical composition of ultra-high energy cosmic rays using arrival directions measured by the Pierre Auger Observatory. United States. https://doi.org/10.1088/1475-7516/2011/06/022
Abreu, P. Fri .
"Anisotropy and chemical composition of ultra-high energy cosmic rays using arrival directions measured by the Pierre Auger Observatory". United States. https://doi.org/10.1088/1475-7516/2011/06/022. https://www.osti.gov/servlets/purl/1022794.
@article{osti_1022794,
title = {Anisotropy and chemical composition of ultra-high energy cosmic rays using arrival directions measured by the Pierre Auger Observatory},
author = {Abreu, P},
abstractNote = {The Pierre Auger Collaboration has reported evidence for anisotropy in the distribution of arrival directions of the cosmic rays with energies E > Eth = 5.5 x 1019 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 > Eth 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 Eth/Z (for illustrative values of Z = 6,13,26). If the anisotropies above Eth 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.},
doi = {10.1088/1475-7516/2011/06/022},
journal = {Journal of Cosmology and Astroparticle Physics},
number = 6,
volume = 2011,
place = {United States},
year = {Fri Jun 17 00:00:00 EDT 2011},
month = {Fri Jun 17 00:00:00 EDT 2011}
}
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