Observation of the large-scale sidereal anisotropy of the galactic cosmic ray intensity at 300 TeV with the Tibet Air Shower Array

THE TIBET ASγ COLLABORATION

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

We report on the observation of the large-scale sidereal anisotropy of Galactic Cosmic Rays (GCRs) at median energy of ∼300 TeV. With long time and high-stability collection by the Tibet air shower array between October 1995 and February 2010, the data used in this analysis contains 3.1×108 air shower events with a median angular resolution of 0.3. A new anisotropy structure at 300 TeV is revealed, which significantly deviates from the picture of cosmic ray isotropic intensity and is different with previous anisotropy observation at Multi-TeV energy. The dominant feature is an excess region that localized at (α = 271.0, δ = 22.1), with a significance of 7.3σ (pre-trial) or 5.4σ (post-trial) and an optimized smoothing of 29. The maximum relative intensity region with an intensity of ∼ 2.0 × 10 3 is around (α = 255.0 , δ = −13.9), that is close to the highest excess region observed by IceCube at 400 TeV.

Original languageEnglish
Title of host publicationProceedings of the 33rd International Cosmic Rays Conference, ICRC 2013
PublisherSociedade Brasileira de Fisica
Volume2013-October
ISBN (Electronic)9788589064293
Publication statusPublished - 2013 Jan 1
Event33rd International Cosmic Rays Conference, ICRC 2013 - Rio de Janeiro, Brazil
Duration: 2013 Jul 22013 Jul 9

Other

Other33rd International Cosmic Rays Conference, ICRC 2013
CountryBrazil
CityRio de Janeiro
Period13/7/213/7/9

Keywords

  • Anisotropy
  • Cosmic rays
  • Tibet AS Array

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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    THE TIBET ASγ COLLABORATION (2013). Observation of the large-scale sidereal anisotropy of the galactic cosmic ray intensity at 300 TeV with the Tibet Air Shower Array. In Proceedings of the 33rd International Cosmic Rays Conference, ICRC 2013 (Vol. 2013-October). Sociedade Brasileira de Fisica.