| dc.creator | Calcagni, Laura Randa | |
| dc.creator | Dova, María Teresa | |
| dc.creator | Hansen, Patricia María | |
| dc.creator | Mariazzi, Analisa Gabriela | |
| dc.creator | Sciutto, Sergio Juan | |
| dc.creator | Tueros, Matías Jorge | |
| dc.creator | Vergara Quispe, Indira Dajhana | |
| dc.creator | Wahlberg, Hernán Pablo | |
| dc.creator | The Pierre Auger Collaboration | |
| dc.date | 2020-03-13 | |
| dc.date | 2021-09-23T16:18:45Z | |
| dc.date.accessioned | 2023-07-15T03:09:57Z | |
| dc.date.available | 2023-07-15T03:09:57Z | |
| dc.identifier | http://sedici.unlp.edu.ar/handle/10915/125507 | |
| dc.identifier | issn:1538-4357 | |
| dc.identifier | issn:0004-637X | |
| dc.identifier.uri | https://repositorioslatinoamericanos.uchile.cl/handle/2250/7464685 | |
| dc.description | We present measurements of the large-scale cosmic-ray anisotropies in right ascension, using data collected by the surface detector array of the Pierre Auger Observatory over more than 14 years. We determine the equatorial dipole component, ~d⊥, through a Fourier analysis in right ascension that includes weights for each event so as to account for the main detector-induced systematic effects. For the energies at which the trigger efficiency of the array is small, the “East-West” method is employed. Besides using the data from the array with detectors separated by 1500 m, we also include data from the smaller but denser sub-array of detectors with 750 m separation, which allows us to extend the analysis down to ∼ 0.03 EeV. The most significant equatorial dipole amplitude obtained is that in the cumulative bin above 8 EeV, d⊥ = 6.0 +1.0 −0.9%, which is inconsistent with isotropy at the 6σ level. In the bins below 8 EeV, we obtain 99% CL upper-bounds on d⊥ at the level of 1 to 3 percent. At energies below 1 EeV, even though the amplitudes are not significant, the phases determined in most of the bins are not far from the right ascension of the Galactic center, at αGC = −94◦ , suggesting a predominantly Galactic origin for anisotropies at these energies. The reconstructed dipole phases in the energy bins above 4 EeV point instead to right ascensions that are almost opposite to the Galactic center one, indicative of an extragalactic cosmic ray origin. | |
| dc.description | La lista completa de autores puede verse en el archivo asociado. | |
| dc.description | Instituto de Física La Plata | |
| dc.format | application/pdf | |
| dc.language | en | |
| dc.rights | http://creativecommons.org/licenses/by/4.0/ | |
| dc.rights | Creative Commons Attribution 4.0 International (CC BY 4.0) | |
| dc.subject | Física | |
| dc.subject | Cosmic ray | |
| dc.subject | Physics | |
| dc.subject | Galactic center | |
| dc.subject | Dipole | |
| dc.subject | Pierre auger observatory | |
| dc.subject | Extragalactic cosmic ray | |
| dc.subject | Observatory | |
| dc.subject | Astrophysics | |
| dc.subject | Right ascension | |
| dc.subject | Galaxy | |
| dc.subject | Amplitude | |
| dc.subject | Energy (signal processing) | |
| dc.title | Cosmic-Ray Anisotropies in Right Ascension Measured by the Pierre Auger Observatory | |
| dc.type | Articulo | |
| dc.type | Articulo | |
