Speaker
Description
The study of cosmic rays with energies above $10^{18}$ eV contributes to a better understanding of the Universe. In particular, the study of anisotropy in their arrival directions is an important tool to unravel the sources of such particles. The state of the art in terms of experiments is currently represented by the Pierre Auger Observatory, the largest cosmic ray observatory in the world. Due to its size of 3,000 km$^2$, it collected an unprecedentedly large
data set over 17 years of operation. In this work we describe results related to anisotropy studies obtained by using such events. These are the large-scale searches in the arrival direction of events with energies above 4 EeV and the analysis of arrival directions of the highest-energy events, exceeding 32 EeV. A remarkable dipolar modulation in right ascension for energies above 8 EeV is observed, as previously reported, with a statistical significance of 6.6$\sigma$ as well as evidence of anisotropy at intermediate angular scale with $\sim15^{\circ}$ Gaussian spread at 4$\sigma$ significance level for cosmic-ray energies above $\sim$ 40 EeV.
Details
R.M. de Almeida, on behalf of the Pierre Auger Collaboration. Universidade Federal Fluminense, Brazil
| Is this abstract from experiment? | Yes |
|---|---|
| Name of experiment and experimental site | Pierre Auger Collaboration |
| Is the speaker for that presentation defined? | Yes |
| Internet talk | Yes |
