Abstract:
The Pierre Auger Collaboration has reported evidence for anisotropy in the distribution of arrival directions of the cosmic rays with energies E > E th = 5.5×10 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. © 2011 IOP Publishing Ltd and SISSA.
Registro:
| Documento: |
Conferencia
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| Título: | Anisotropies and chemical composition of ultra-high energy cosmic rays using arrival directions measured by the Pierre Auger Observatory |
| Autor: | Abreu, P. et al.
Este artículo contiene 493 autores, consultelos en el artículo en formato pdf.
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| Ciudad: | Beijing |
| Filiación: |
Este artículo contiene 493 autores con sus filiaciones, consultelas en el artículo en formato pdf.
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| Palabras clave: | Anisotropies; Chemical composition; Pierre auger observatory; Ultra-high energy cosmic rays; Anisotropy; Augers; Cosmology; Galaxies; Observatories; Active - galaxies; Arrival direction; Chemical compositions; Lower energies; Pierre Auger observatory; Proton fraction; Stringent constraints; Ultra high-energy cosmic rays; Cosmic rays |
| Año: | 2011
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| Volumen: | 2
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| Página de inicio: | 137
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| Página de fin: | 140
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| DOI: |
http://dx.doi.org/10.7529/ICRC2011/V02/0868 |
| Título revista: | 32nd International Cosmic Ray Conference, ICRC 2011
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| Título revista abreviado: | Proc. Int. Cosm. Ray Conf., ICRC
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| Registro: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_NIS23781_v2_n_p137_Abreu |
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Citas:
---------- APA ----------
(2011)
. Anisotropies and chemical composition of ultra-high energy cosmic rays using arrival directions measured by the Pierre Auger Observatory. 32nd International Cosmic Ray Conference, ICRC 2011, 2, 137-140.
http://dx.doi.org/10.7529/ICRC2011/V02/0868---------- CHICAGO ----------
Abreu, P.
"Anisotropies and chemical composition of ultra-high energy cosmic rays using arrival directions measured by the Pierre Auger Observatory"
. 32nd International Cosmic Ray Conference, ICRC 2011 2
(2011) : 137-140.
http://dx.doi.org/10.7529/ICRC2011/V02/0868---------- MLA ----------
Abreu, P.
"Anisotropies and chemical composition of ultra-high energy cosmic rays using arrival directions measured by the Pierre Auger Observatory"
. 32nd International Cosmic Ray Conference, ICRC 2011, vol. 2, 2011, pp. 137-140.
http://dx.doi.org/10.7529/ICRC2011/V02/0868---------- VANCOUVER ----------
Abreu, P. Anisotropies and chemical composition of ultra-high energy cosmic rays using arrival directions measured by the Pierre Auger Observatory. Proc. Int. Cosm. Ray Conf., ICRC. 2011;2:137-140.
http://dx.doi.org/10.7529/ICRC2011/V02/0868