RICAP-24 Roma International Conference on AstroParticle Physics

Session

High Energy Cosmic Rays

24 Sept 2024, 17:00

Sala Vanvitelli

Conveners

High Energy Cosmic Rays: - 2

• Raffaella Bonino (Istituto Nazionale di Fisica Nucleare)

251. Energy evolution of cosmic-ray mass and intensity measured by the Pierre Auger Observatory

Vladimir Novotny (IPNP, Charles University)

24/09/2024, 17:00

oral

The Pierre Auger Observatory has conducted measurements of the energy spectrum and mass composition of cosmic rays using different methods. Utilizing both surface and fluorescence detectors (FD and SD), the Observatory provides unprecedented precision in understanding these particles. While primarily designed to measure ultra-high-energy cosmic rays, the FD's high-elevation telescopes and the...

282. Anisotropy searches at the highest energy cosmic rays with the Pierre Auger Observatory Phase I

Federico Maria Mariani (Istituto Nazionale di Fisica Nucleare)

24/09/2024, 17:17

oral

Ultra-high-energy cosmic rays (UHECRs) provide a unique window into the most energetic processes in the universe, yet their origins remain unknown. The near-isotropic distribution of arrival directions observed by the Pierre Auger Observatory suggests that a dominant Galactic source is unlikely, prompting investigations into nearby galaxy groups and clusters as potential origins of UHECRs....

270. On the challenging problem to estimate the energy of the Ultra High Energy Cosmic Rays

Valerio Verzi (Istituto Nazionale di Fisica Nucleare)

24/09/2024, 17:34

oral

Ultra High Energy Cosmic Rays (UHECRs) are rare nuclei that collides in the atmosphere with energy larger than $10^{18}$ eV producing a shower cascade made by bilions of particles. An estimation of the shower energy with a good control of the systematic uncertainties is attained with the fluorescence detector technique. The two largest observatories built to date, the Pierre Auger observatory...

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

Marta Bianciotto (Istituto Nazionale di Fisica Nucleare)

24/09/2024, 17:51

oral

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...

154. UHECR : Lightest to heavy nuclei confined in a nearest Universe

Daniele Fargion

24/09/2024, 18:08

oral

Ultra High Energy Cosmic Rays, UHECR, since last two decades offered new hopes for a new Astronomy. Cosmic Rays in TeV- PeV energy range, are mostly bent by galactic magnetic fields, feeding an homogeneous noisy sky. But the highest energy particle rigidity, above tens EeV, are expected to follow nearly rectilinear trajectories tracing their sources. The surprising evolution, with growing...

346. Echoes from the "Council of Giants"

Andrew Taylor

24/09/2024, 18:25

oral

285. The Pierre Auger Observatory and Super Heavy Dark Matter

Roberto Aloisio (GSSI and INFN)

24/09/2024, 18:42

oral

We discuss the connection of the Pierre Auger Observatory data with a large class of dark matter models based on the early-universe generation of super-heavy particles, their role in the solution of the dark matter problem, highlighting the remarkable constraining capabilities of the Auger observations.

347. Echoes from Cen A's Active Past

oral

Motivated by both the apparent lack of local extragalactic UHECR source
candidates, beyond Cen A, and the correlation of UHECR anisotropies
with local extragalactic structure, we investigate a scenario in which
these anisotropies are imprinted during propagation. Such a possibility
builds on the idea that galaxies are enshrouded in an extended halo of
hot gas, which we postulate is also...