Understanding TeV-band cosmic-ray anisotropy

Abstract

We investigate the temporal and spectral correlations between flux and anisotropy fluctuations of TeV-band cosmic rays in the light of recent data taken with IceCube. We find that for a conventional distribution of cosmic-ray sources the dipole anisotropy is higher than observed, even if source discreteness is taken into account. Moreover, even for a shallow distribution of galactic cosmic-ray sources and a reacceleration model, fluctuations arising from source discreteness provide a probability only of the order of 10% that the cosmic-ray anisotropy limits of the recent IceCube analysis are met. This probability estimate is nearly independent of the exact choice of source rate, but generous for a large halo size. The location of the intensity maximum far from the Galactic Center is naturally reproduced.

ApJ submitted

References in corpus (8)

• Discrepant hardening observed in cosmic-ray elemental spectra
• Cosmic-Ray Proton and Helium Spectra from the First CREAM Flight
• Anisotropy and Corotation of Galactic Cosmic Rays
• The Large Scale Cosmic-Ray Anisotropy as Observed with Milagro
• Measurement of the Anisotropy of Cosmic Ray Arrival Directions with IceCube
• Evolution of the cosmic ray anisotropy above 10^{14} eV
• The boron-to-carbon abundance ratio and Galactic propagation of cosmic radiation
• Secondary Cosmic Ray Nuclei from Supernova Remnants and Constraints to the Propagation Parameters

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