Ultrahigh-energy cosmic rays dipole and beyond. LANG, Rodrigo Guedes; TAYLOR, Andrew M.; SOUZA, Vitor de.
Abstract: Recent data from the Pierre Auger Observatory has revealed the presence of a large-scale dipole in the arrival direction distribution of ultrahigh-energy cosmic rays (UHECR). In this work, we build up an understanding of the diffusive origin of such a dipolar behavior as well as its dependency on energy and astrophysical source assumptions such as extra-Galactic magnetic field strength and cosmic ray composition. We present a novel analytical approach for calculating the angular distribution of CR coming from a single source and discuss the regimes in which the steady-state dipole result is expected. We also present a semianalytical method for calculating the evolution with energy of the resultant dipole for an ensemble of sources.We show that a local source allows for a strong growth of the dipole with energy over a large energy range. The possibility of a transition from a dipolar to nondipolar regime at the highest energies and its implications for the source density, magnetic field intensity, and cosmic ray composition are discussed.
Physical Review D
v. 103, n. 6, p. 063005-1-063005-12 - Ano: 2021
Fator de Impacto: 4,833
@article={003022234,author = {LANG, Rodrigo Guedes; TAYLOR, Andrew M.; SOUZA, Vitor de.},title={Ultrahigh-energy cosmic rays dipole and beyond},journal={Physical Review D},note={v. 103, n. 6, p. 063005-1-063005-12},year={2021}}
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Abstract: Recent data from the Pierre Auger Observatory has revealed the presence of a large-scale dipole in the arrival direction distribution of ultrahigh-energy cosmic rays (UHECR). In this work, we build up an understanding of the diffusive origin of such a dipolar behavior as well as its dependency on energy and astrophysical source assumptions such as extra-Galactic magnetic field strength and cosmic ray composition. We present a novel analytical approach for calculating the angular distribution of CR coming from a single source and discuss the regimes in which the steady-state dipole result is expected. We also present a semianalytical method for calculating the evolution with energy of the resultant dipole for an ensemble of sources.We show that a local source allows for a strong growth of the dipole with energy over a large energy range. The possibility of a transition from a dipolar to nondipolar regime at the highest energies and its implications for the source density, magnetic field intensity, and cosmic ray composition are discussed.
@article={003022234,author = {LANG, Rodrigo Guedes; TAYLOR, Andrew M.; SOUZA, Vitor de.},title={Ultrahigh-energy cosmic rays dipole and beyond},journal={Physical Review D},note={v. 103, n. 6, p. 063005-1-063005-12},year={2021}}