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

研究成果

抄録

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.

本文言語English
ホスト出版物のタイトルProceedings of the 33rd International Cosmic Rays Conference, ICRC 2013
出版社Sociedade Brasileira de Fisica
2013-October
ISBN(電子版)9788589064293
出版ステータスPublished - 2013 1 1
イベント33rd International Cosmic Rays Conference, ICRC 2013 - Rio de Janeiro, Brazil
継続期間: 2013 7 22013 7 9

Other

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

ASJC Scopus subject areas

  • 核物理学および高エネルギー物理学

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