MEASUREMENT OF THE ANISOTROPY OF COSMIC-RAY ARRIVAL DIRECTIONS WITH ICECUBE

By R. Abbasi, Y. Abdou, T. Abu-Zayyad, J. Adams, J. Aguilar, M. Ahlers, K. Andeen, J. Auffenberg, X. Bai, M. Baker and 249 more. 2010

143 citations recorded by the source corpus.

We report the first observation of an anisotropy in the arrival direction of cosmic rays with energies in the multi-TeV region in the Southern sky using data from the IceCube detector. Between 2007 June and 2008 March, the partially deployed IceCube detector was operated in a configuration with 1320 digital optical sensors distributed over 22 strings at depths between 1450 and 2450 m inside the Antarctic ice. IceCube is a neutrino detector, but the data are dominated by a large background of cosmic-ray muons. Therefore, the background data are suitable for high-statistics studies of cosmic rays in the southern sky. The data include 4.3 billion muons produced by downward-going cosmic-ray interactions in the atmosphere; these events were reconstructed with a median angular resolution of 3° and a median energy of ∼20 TeV. Their arrival direction distribution exhibits an anisotropy in right ascension with a first-harmonic amplitude of (6.4 ± 0.2 stat. ± 0.8 syst.) × 10−4.

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/60679220395061e7719321e8215ccb96039e9ed0

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In Nuclear and High Energy Physics

1. A. Fedynitch
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Citations in the corpus

• OBSERVATION OF ANISOTROPY IN THE GALACTIC COSMIC-RAY ARRIVAL DIRECTIONS AT 400 TeV WITH ICECUBE (2011, methodology): “The sidereal anisotropy observed at 20 TeV with IceCube-40 is found to be consistent with the reported observation with IceCube-22 (Abbasi et al. 2010a) and with that observed using the IceCube-59 string configuration.”
• PROBING THE PULSAR ORIGIN OF THE ANOMALOUS POSITRON FRACTION WITH AMS-02 AND ATMOSPHERIC CHERENKOV TELESCOPES (2013, background): “While the exact magnitude of this anisotropy is difficult to ascertain, as mea- 8 surements by MILAGRO (Abdo et al. 2009) and ICECUBE (Abbasi et al. 2009, 2010) measured the proton anisotropy for median proton energies of 6 TeV and 20 TeV respectively.”