# Europhysics Conference on High-Energy Physics 2011

20-27 July 2011
Alpes Congrès - Alpexpo
Europe/Paris timezone

## Searches for anisotropies of cosmic rays at the Pierre Auger Observatory

21 Jul 2011, 11:45
15m
Berlioz (Alpes Congrès - Alpexpo)

### Berlioz

#### Alpes Congrès - Alpexpo

Parallel session talk Astroparticle Physics

### Speaker

Haris, for the Pierre Auger Collaboration Lyberis (Institut de Physique Nucléaire d'Orsay, Università degli Studi di Torino, Université Paris VII Denis Diderot)

### Description

We report on the analysis of the distribution of the arrival directions of ultra high energy cosmic rays detected at the Pierre Auger Observatory. From $2.10^{17}~$eV to $3.10^{19}~$eV, we present the results of searches for first harmonic modulations in the right-ascension distribution of cosmic rays and discuss the obtained upper limits which constitute the most stringent bounds at present above $2.10^{17}~$eV. At the highest energies, the observation of the flux steepening is consistent with the shortening of the horizon of ultra high energy cosmic rays and leads to the possibility of "cosmic ray astronomy". Thus, we present the analyses searching for correlation of cosmic rays with nearby extragalactic astrophysical objects.

### Primary author

Haris, for the Pierre Auger Collaboration Lyberis (Institut de Physique Nucléaire d'Orsay, Università degli Studi di Torino, Université Paris VII Denis Diderot)

 Slides