# Recent results from the Pierre Auger Observatory

## TL;DR

The Pierre Auger Observatory's recent observations of ultra-high-energy cosmic rays reveal detailed spectrum, directional data, and limits on photon and neutrino components, enhancing understanding of cosmic ray origins.

## Contribution

This paper presents new observational data from the expanded Pierre Auger Observatory, including spectrum, arrival directions, and particle composition limits, advancing cosmic ray research.

## Key findings

- Cosmic ray spectrum measured above 1 EeV.
- Anisotropy in arrival directions observed.
- Limits set on photon and neutrino components.

## Abstract

We report on the observations of cosmic rays with energies > 1.0 EeV from Jan 2004 to April 2009 by the Pierre Auger Observatory. During this period the Observatory has grown from about 300 surface detectors to about 1600 upon its completion in November 2008. The 1600 surface detectors are overlooked by 24 fluorescence telescopes. We report on measurements of the cosmic ray spectrum, the arrival directions and the elongation rate. We also report limits for the photon and neutrino components of this cosmic radiation.