Searches for anisotropies in the arrival directions of the highest energy cosmic rays detected by the pierre auger observatory
We analyze the distribution of arrival directions of ultra-high-energy cosmic rays recorded at the Pierre Auger Observatory in 10 years of operation. The data set, about three times larger than that used in earlier studies, includes arrival directions with zenith angles up to 80°, thus covering from...
Guardado en:
| Publicado: |
2015
|
|---|---|
| Materias: | |
| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0004637X_v804_n1_p_Multitudinario http://hdl.handle.net/20.500.12110/paper_0004637X_v804_n1_p_Multitudinario |
| Aporte de: |
| id |
paper:paper_0004637X_v804_n1_p_Multitudinario |
|---|---|
| record_format |
dspace |
| spelling |
paper:paper_0004637X_v804_n1_p_Multitudinario2023-06-08T14:29:14Z Searches for anisotropies in the arrival directions of the highest energy cosmic rays detected by the pierre auger observatory acceleration of particles astroparticle physics We analyze the distribution of arrival directions of ultra-high-energy cosmic rays recorded at the Pierre Auger Observatory in 10 years of operation. The data set, about three times larger than that used in earlier studies, includes arrival directions with zenith angles up to 80°, thus covering from -90°to +45°in declination. After updating the fraction of events correlating with the active galactic nuclei (AGNs) in the Vron-Cetty and Vron catalog, we subject the arrival directions of the data with energies in excess of 40 EeV to different tests for anisotropy. We search for localized excess fluxes, self-clustering of event directions at angular scales up to 30°, and different threshold energies between 40 and 80 EeV. We then look for correlations of cosmic rays with celestial structures both in the Galaxy (the Galactic Center and Galactic Plane) and in the local universe (the Super- Galactic Plane). We also examine their correlation with different populations of nearby extragalactic objects: galaxies in the 2MRS catalog, AGNs detected by Swift-BAT, radio galaxies with jets, and the Centaurus A (Cen A) galaxy. None of the tests show statistically significant evidence of anisotropy. The strongest departures from isotropy (post-trial probability ∼1.4%) are obtained for cosmic rays with E >; 58 EeV in rather large windows around Swift AGNs closer than 130 Mpc and brighter than 10 44 erg s -1 (18° radius), and around the direction of Cen A (15° radius). © 2015. The American Astronomical Society. All rights reserved. 2015 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0004637X_v804_n1_p_Multitudinario http://hdl.handle.net/20.500.12110/paper_0004637X_v804_n1_p_Multitudinario |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
acceleration of particles astroparticle physics |
| spellingShingle |
acceleration of particles astroparticle physics Searches for anisotropies in the arrival directions of the highest energy cosmic rays detected by the pierre auger observatory |
| topic_facet |
acceleration of particles astroparticle physics |
| description |
We analyze the distribution of arrival directions of ultra-high-energy cosmic rays recorded at the Pierre Auger Observatory in 10 years of operation. The data set, about three times larger than that used in earlier studies, includes arrival directions with zenith angles up to 80°, thus covering from -90°to +45°in declination. After updating the fraction of events correlating with the active galactic nuclei (AGNs) in the Vron-Cetty and Vron catalog, we subject the arrival directions of the data with energies in excess of 40 EeV to different tests for anisotropy. We search for localized excess fluxes, self-clustering of event directions at angular scales up to 30°, and different threshold energies between 40 and 80 EeV. We then look for correlations of cosmic rays with celestial structures both in the Galaxy (the Galactic Center and Galactic Plane) and in the local universe (the Super- Galactic Plane). We also examine their correlation with different populations of nearby extragalactic objects: galaxies in the 2MRS catalog, AGNs detected by Swift-BAT, radio galaxies with jets, and the Centaurus A (Cen A) galaxy. None of the tests show statistically significant evidence of anisotropy. The strongest departures from isotropy (post-trial probability ∼1.4%) are obtained for cosmic rays with E >; 58 EeV in rather large windows around Swift AGNs closer than 130 Mpc and brighter than 10 44 erg s -1 (18° radius), and around the direction of Cen A (15° radius). © 2015. The American Astronomical Society. All rights reserved. |
| title |
Searches for anisotropies in the arrival directions of the highest energy cosmic rays detected by the pierre auger observatory |
| title_short |
Searches for anisotropies in the arrival directions of the highest energy cosmic rays detected by the pierre auger observatory |
| title_full |
Searches for anisotropies in the arrival directions of the highest energy cosmic rays detected by the pierre auger observatory |
| title_fullStr |
Searches for anisotropies in the arrival directions of the highest energy cosmic rays detected by the pierre auger observatory |
| title_full_unstemmed |
Searches for anisotropies in the arrival directions of the highest energy cosmic rays detected by the pierre auger observatory |
| title_sort |
searches for anisotropies in the arrival directions of the highest energy cosmic rays detected by the pierre auger observatory |
| publishDate |
2015 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0004637X_v804_n1_p_Multitudinario http://hdl.handle.net/20.500.12110/paper_0004637X_v804_n1_p_Multitudinario |
| _version_ |
1768542578692587520 |