Anisotropy 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 $E>E_{th}=5.5\times 10^{19}$ eV. These show a correlation with the distribution of nearby extragalactic objects, including an apparent excess around t...
| Asıl Yazarlar: | , , , , , , , , , , , , , , , , , , , , , , , , |
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| Materyal Türü: | Journal article |
| Dil: | English |
| Baskı/Yayın Bilgisi: |
2011
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| _version_ | 1826303301030772736 |
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| author | Collaboration, TPA Abreu, P Aglietta, M Ahn, E Albuquerque, I Allard, D Allekotte, I Allen, J Allison, P Castillo, J Alvarez-Muñiz, J Ambrosio, M Aminaei, A Anchordoqui, L Andringa, S Antičić, T Anzalone, A Aramo, C Arganda, E Arqueros, F Asorey, H Assis, P Aublin, J Ave, M Avenier, M |
| author_facet | Collaboration, TPA Abreu, P Aglietta, M Ahn, E Albuquerque, I Allard, D Allekotte, I Allen, J Allison, P Castillo, J Alvarez-Muñiz, J Ambrosio, M Aminaei, A Anchordoqui, L Andringa, S Antičić, T Anzalone, A Aramo, C Arganda, E Arqueros, F Asorey, H Assis, P Aublin, J Ave, M Avenier, M |
| author_sort | Collaboration, TPA |
| collection | OXFORD |
| description | The Pierre Auger Collaboration has reported evidence for anisotropy in the distribution of arrival directions of the cosmic rays with energies $E>E_{th}=5.5\times 10^{19}$ 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. |
| first_indexed | 2024-03-07T06:00:35Z |
| format | Journal article |
| id | oxford-uuid:ec09b214-b8e4-42e2-ad9d-1f56a53d9b07 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T06:00:35Z |
| publishDate | 2011 |
| record_format | dspace |
| spelling | oxford-uuid:ec09b214-b8e4-42e2-ad9d-1f56a53d9b072022-03-27T11:14:32ZAnisotropy and chemical composition of ultra-high energy cosmic rays using arrival directions measured by the Pierre Auger ObservatoryJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:ec09b214-b8e4-42e2-ad9d-1f56a53d9b07EnglishSymplectic Elements at Oxford2011Collaboration, TPAAbreu, PAglietta, MAhn, EAlbuquerque, IAllard, DAllekotte, IAllen, JAllison, PCastillo, JAlvarez-Muñiz, JAmbrosio, MAminaei, AAnchordoqui, LAndringa, SAntičić, TAnzalone, AAramo, CArganda, EArqueros, FAsorey, HAssis, PAublin, JAve, MAvenier, MThe 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. |
| spellingShingle | Collaboration, TPA Abreu, P Aglietta, M Ahn, E Albuquerque, I Allard, D Allekotte, I Allen, J Allison, P Castillo, J Alvarez-Muñiz, J Ambrosio, M Aminaei, A Anchordoqui, L Andringa, S Antičić, T Anzalone, A Aramo, C Arganda, E Arqueros, F Asorey, H Assis, P Aublin, J Ave, M Avenier, M Anisotropy and chemical composition of ultra-high energy cosmic rays using arrival directions measured by the Pierre Auger Observatory |
| title | Anisotropy and chemical composition of ultra-high energy cosmic rays
using arrival directions measured by the Pierre Auger Observatory |
| title_full | Anisotropy and chemical composition of ultra-high energy cosmic rays
using arrival directions measured by the Pierre Auger Observatory |
| title_fullStr | Anisotropy and chemical composition of ultra-high energy cosmic rays
using arrival directions measured by the Pierre Auger Observatory |
| title_full_unstemmed | Anisotropy and chemical composition of ultra-high energy cosmic rays
using arrival directions measured by the Pierre Auger Observatory |
| title_short | Anisotropy and chemical composition of ultra-high energy cosmic rays
using arrival directions measured by the Pierre Auger Observatory |
| title_sort | anisotropy and chemical composition of ultra high energy cosmic rays using arrival directions measured by the pierre auger observatory |
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