RICAP-24 Roma International Conference on AstroParticle Physics

Large-scale anisotropies of ultra-high-energy cosmic rays measured at the Pierre Auger Observatory

24 Sept 2024, 17:51

17m

Sala Vanvitelli

oral High Energy Cosmic Rays

Speaker

Marta Bianciotto (Istituto Nazionale di Fisica Nucleare)

Description

Measurements of anisotropies in the arrival directions of ultra-high-energy cosmic rays are crucial to pinpoint their sources, which are yet to be discovered. A dipolar anisotropy in right ascension above 8 EeV has been detected by the Pierre Auger Observatory with a significance of $6.9\sigma$. The direction of the dipole suggests an extragalactic origin of ultra-high-energy cosmic rays above those energies. In this contribution, we provide an overview of the studies on large-scale anisotropies in the arrival directions of ultra-high-energy cosmic rays measured at the Pierre Auger Observatory with energy thresholds from $\sim 0.03$ EeV up to $32$ EeV and we present and discuss the recent results achieved with the latest available dataset, which includes 19 years of operations - resulting in a total exposure of 123,000 km${}^2$ sr yr.

Presentation materials

RICAP_Bianciotto_2024.pdf