Examinando por Autor "Micheletti, M. I."
Mostrando 1 - 10 de 10
Resultados por página
Opciones de ordenación
Ítem Acceso Abierto A catalog of the highest-energy cosmic rays recorded during phase I of operation of the Pierre Auger Observatory(American Astronomical Society, 2023-02-01) Binet, V.; Micheletti, M. I.; The Pierre Auger collaborationÍtem Acceso Abierto A search for photons with energies above 2×1017 eV using hybrid data from the low energy extensions of the Pierre Auger Observatory(Institute of Physics, 2022-07-08) Binet, V.; Micheletti, M. I.; The Pierre Auger collaborationÍtem Acceso Abierto Arrival directions of vosmic rays above 32 EeV from phase one of the Pierre Auger Observatory(Institute of Physics, 2022-08-20) Micheletti, M. I.; Binet, V.; The Pierre Auger collaborationÍtem Acceso Abierto Calibration of the underground muon detector of the Pierre Auger Observatory(IOP Publishing, 2021-04-06) The Pierre Auger collaboration; Freire, M. M.; Micheletti, M. I.Ítem Acceso Abierto Constraining models for the origin of ultra-high-energy cosmic rays with a novel combined analysis of arrival directions, spectrum, and composition data measured at the Pierre Auger Observatory(Institute of Physics, 2024-01-01) Binet, V.; Micheletti, M. I.; The Pierre Auger collaborationThe combined fit of the measured energy spectrum and shower maximum depth distributions of ultra-high-energy cosmic rays is known to constrain the parameters of astrophysical models with homogeneous source distributions. Studies of the distribution of the cosmic-ray arrival directions show a better agreement with models in which a fraction of the flux is non-isotropic and associated with the nearby radio galaxy Centaurus A or with catalogs such as that of starburst galaxies. Here, we present a novel combination of both analyses by a simultaneous fit of arrival directions, energy spectrum, and composition data measured at the Pierre Auger Observatory. The model takes into account a rigidity-dependent magnetic field blurring and an energy-dependent evolution of the catalog contribution shaped by interactions during propagation. We find that a model containing a flux contribution from the starburst galaxy catalog of around 20% at 40 EeV with a magnetic field blurring of around 20◦ for a rigidity of 10 EV provides a fair simultaneous description of all three observables. The starburst galaxy model is favored with a significance of 4.5σ (considering experimental systematic effects) compared to a reference model with only homogeneously distributed background sources. By investigating a scenario with Centaurus A as a single source in combination with the homogeneous background, we confirm that this region of the sky provides the dominant contribution to the observed anisotropy signal. Models containing a catalog of jetted active galactic nuclei whose flux scales with the γ-ray emission are, however, disfavored as they cannot adequately describe the measured arrival directions.Ítem Acceso Abierto Deep-learning based reconstruction of the shower maximum Xmax using the water-Cherenkov detectors of the Pierre Auger Observatory(IOP Publishing, 2021-07-14) Freir, M. M.; Micheletti, M. I.; The Pierre Auger collaborationÍtem Acceso Abierto Radio measurements of the depth of air-shower maximum at the Pierre Auger Observatory(American Physical Society, 2023-01-08) Binet, V.; Micheletti, M. I.; The Pierre Auger collaborationThe Auger Engineering Radio Array (AERA), part of the Pierre Auger Observatory, is currently the largest array of radio antenna stations deployed for the detection of cosmic rays, spanning an area of 17 km2 with 153 radio stations. It detects the radio emission of extensive air showers produced by cosmic rays in the 30-80 MHz band. Here, we report the AERA measurements of the depth of the shower maximum (Xmax), a probe for mass composition, at cosmic-ray energies between 1017.5 and 1018.8 eV, which show agreement with earlier measurements with the fluorescence technique at the Pierre Auger Observatory. We show advancements in the method for radio Xmax reconstruction by comparison to dedicated sets of corsika/coreas air-shower simulations, including steps of reconstruction-bias identification and correction, which is of particular importance for irregular or sparse radio arrays. Using the largest set of radio air-shower measurements to date, we show the radio Xmax resolution as a function of energy, reaching a resolution better than 15 g cm-2 at the highest energies, demonstrating that radio Xmax measurements are competitive with the established high-precision fluorescence technique. In addition, we developed a procedure for performing an extensive data-driven study of systematic uncertainties, including the effects of acceptance bias, reconstruction bias, and the investigation of possible residual biases. These results have been cross-checked with air showers measured independently with both the radio and fluorescence techniques, a setup unique to the Pierre Auger Observatory.Ítem Acceso Abierto Search for spatial correlations of Neutrinos with Ultra-high-energy Cosmic Rays(Institute of Physics, 2022-08-03) The ANTARES collaboration; The IceCube collaboration; The Pierre Auger collaboration; The Telescope Array collaboration; Binet, V.; Micheletti, M. I.Ítem Acceso Abierto Testing effects of Lorentz invariance violation in the propagation of astroparticles with the Pierre Auger Observatory(IOP Publishing, 2022-01-17) Binet, V.; Micheletti, M. I.; The Pierre Auger collaborationÍtem Acceso Abierto The energy spectrum of cosmic rays beyond the turn-down around 1017 eV as measured with the surface detector of the Pierre Auger Observatory(Springer Science and Business, 2021-11-02) Binet, V.; Micheletti, M. I.; The Pierre Auger collaboration