English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Cosmic rays are atomic nuclei arriving from outer space that reach thehighest energies observed in nature. Clues to their origin come from studyingthe distribution of their arrival directions. Using $3 \times 10^4$ cosmic raysabove $8 \times 10^{18}$ electron volts, recorded with the Pierre AugerObservatory from a total exposure of 76,800 square kilometers steradian year,we report an anisotropy in the arrival directions. The anisotropy, detected atmore than the 5.2$\sigma$ level of significance, can be described by a dipolewith an amplitude of $6.5_{-0.9}^{+1.3}$% towards right ascension $\alpha_{d} =100 \pm 10$ degrees and declination $\delta_{d} = -24_{-13}^{+12}$ degrees.That direction indicates an extragalactic origin for these ultra-high energyparticles.

Observation of a Large-scale Anisotropy in the Arrival Directions of Cosmic Rays above $8 \times 10^{18}$ eV