Anisotropies and chemical composition of ultra-high energy cosmic rays using arrival directions measured by the Pierre Auger Observatory
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 direc...
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2011
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| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_NIS23781_v2_n_p137_Abreu http://hdl.handle.net/20.500.12110/paper_NIS23781_v2_n_p137_Abreu |
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paper:paper_NIS23781_v2_n_p137_Abreu2023-06-08T16:40:03Z Anisotropies and chemical composition of ultra-high energy cosmic rays using arrival directions measured by the Pierre Auger Observatory 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 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. 2011 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_NIS23781_v2_n_p137_Abreu http://hdl.handle.net/20.500.12110/paper_NIS23781_v2_n_p137_Abreu |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
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 |
| spellingShingle |
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 Anisotropies and chemical composition of ultra-high energy cosmic rays using arrival directions measured by the Pierre Auger Observatory |
| topic_facet |
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 |
| description |
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. |
| title |
Anisotropies and chemical composition of ultra-high energy cosmic rays using arrival directions measured by the Pierre Auger Observatory |
| title_short |
Anisotropies and chemical composition of ultra-high energy cosmic rays using arrival directions measured by the Pierre Auger Observatory |
| title_full |
Anisotropies and chemical composition of ultra-high energy cosmic rays using arrival directions measured by the Pierre Auger Observatory |
| title_fullStr |
Anisotropies and chemical composition of ultra-high energy cosmic rays using arrival directions measured by the Pierre Auger Observatory |
| title_full_unstemmed |
Anisotropies and chemical composition of ultra-high energy cosmic rays using arrival directions measured by the Pierre Auger Observatory |
| title_sort |
anisotropies and chemical composition of ultra-high energy cosmic rays using arrival directions measured by the pierre auger observatory |
| publishDate |
2011 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_NIS23781_v2_n_p137_Abreu http://hdl.handle.net/20.500.12110/paper_NIS23781_v2_n_p137_Abreu |
| _version_ |
1769175834732527616 |