Measurement of the Anisotropy of Cosmic Ray Arrival Directions with IceCube - Astrophysics > High Energy Astrophysical PhenomenaReport as inadecuate




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Abstract: We report the first observation of an anisotropy in the arrival direction ofcosmic rays with energies in the multi TeV region in the Southern sky usingdata from the IceCube detector. Between June 2007 and March 2008, thepartially-deployed IceCube detector was operated in a configuration with 1320digital optical sensors distributed over 22 strings at depths between 1450 and2450 meters inside the Antarctic ice. IceCube is a neutrino detector, but thedata are dominated by a large background of cosmic ray muons. Therefore, thebackground data are suitable for high-statistics studies of cosmic rays in theSouthern sky. The data include 4.3 billion muons produced by downgoing cosmicray interactions in the atmosphere; these events were reconstructed with amedian angular resolution of 3 degrees and a median energy of $\sim20$ TeV.Their arrival direction distribution exhibits an anisotropy in right ascensionwith a first harmonic amplitude of $6.4\pm0.2 $stat$. \pm 0.8$syst$.\times10^{-4}$.



Author: The IceCube Collaboration: R. Abbasi, et al

Source: https://arxiv.org/







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