Depth of maximum of air-shower profiles: testing the compatibility of the measurements at the Pierre Auger Observatory and the Telescope Array
Cargando...
Compartir
Fecha
Título de la revista
ISSN de la revista
Título del volumen
Editor
et al.; Institute for Cosmic Ray Research (ICRR) Univeristy of Tokyo; International Union of Pure and Applied Physics (IUPAP); JPS; Nagoya Convention and Visitors Bureau; Nagoya University
Resumen
Descripción
The Pierre Auger Observatory (Auger) and the Telescope Array (TA), located, respectively, in the Southern and Northern hemispheres, are the largest ultra-high-energy cosmic ray (UHECR) observatories. The Auger and TA Collaborations have collected unprecedented statistics providing us with a unique opportunity to search for the differences between the UHECR energy spectra and mass compositions in the complementary sky regions. To correctly attribute such differences to the properties of the UHECR sources or propagation, the systematic effects in the measurements of each observatory should be considered properly. In this context, the task of the Auger - TA mass composition working group is to identify possible differences of astrophysical origin in the measurements of the depth of the maximum of air-shower profiles, Xmax, performed at both observatories using the fluorescence technique. Due to distinct approaches to event selection and analysis at Auger and TA, the working group uses a specially designed method to transfer the Auger Xmax distributions into the TA detector. To this end, dedicated air-shower and detector simulations for the TA Black Rock Mesa and Long Ridge fluorescence detector stations were performed with the Sibyll 2.3d hadronic interaction model. From the comparison of the first two moments and the shapes of Xmax distributions for energies above 1018.2 eV, no significant differences between the Auger and TA measurements were found. © Copyright owned by the author(s) under the terms of the Creative Commons.
Palabras clave
Cosmic ray detectors, Cosmic ray measurement, Cosmology, Photons, Telescopes, Air showers, Cosmic ray energy spectrum, Mass composition, Measurements of, Northern Hemispheres, Pierre Auger observatory, Southern Hemisphere, Telescope arrays, Ultra high-energy cosmic rays, Working groups, Cosmic rays
