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

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.

Año de publicación:

2013

Keywords:

  • anisotropy
  • Tibet AS array
  • cosmic rays

Fuente:

scopusscopus

Tipo de documento:

Conference Object

Estado:

Acceso restringido

Áreas de conocimiento:

  • Rayo cósmico
  • Ciencia planetaria
  • Ciencia planetaria

Áreas temáticas:

  • Física moderna
  • Astronomía y ciencias afines

Contribuidores:

Shibata M.Shibata M.
Labaciren Labaciren
Hotta N.Hotta N.
Jia H.Y.Jia H.Y.
Chen T.L.Chen T.L.
Kasahara K.Kasahara K.
Sakata M.Sakata M.
Lu H.Lu H.
Bi X.J.Bi X.J.
Amenomori M.Amenomori M.
Danzengluobu Danzengluobu
Zhaxisangzhu Zhaxisangzhu
Yuan A.F.Yuan A.F.
Zhou X.X.Zhou X.X.
Gou Q.B.Gou Q.B.
Tsuchiya H.Tsuchiya H.
Liu C.Liu C.
Ding L.K.Ding L.K.
Huang J.Huang J.
Qu X.B.Qu X.B.
Li H.J.Li H.J.
Cui S.W.Cui S.W.
Zhang H.M.Zhang H.M.
Li W.J.Li W.J.
Xue L.Xue L.
Nanjo H.Nanjo H.
Li A.F.Li A.F.
Mizutani K.Mizutani K.
Wu H.R.Wu H.R.
Tan Y.H.Tan Y.H.
Chen D.Chen D.
Guo Y.Q.Guo Y.Q.
Udo S.Udo S.
Hu H.B.Hu H.B.
T. K. SakoT. K. Sako
Kajino F.Kajino F.
Takita M.Takita M.
Hu H.B.Hu H.B.
Torii S.Torii S.
Zhai L.M.Zhai L.M.
Shirai T.Shirai T.
Ohnishi M.Ohnishi M.
Wang H.Wang H.
Yamamoto Y.Yamamoto Y.
Feng Z.Y.Feng Z.Y.
Kozai M.Kozai M.
Feng Z.Y.Feng Z.Y.
Yasue S.Yasue S.
Feng C.F.Feng C.F.
Kato C.Kato C.
Zhang J.L.Zhang J.L.
Zhang X.Y.Zhang X.Y.
Liu M.Y.Liu M.Y.
Chen W.Y.Chen W.Y.
Yang Z.Yang Z.
Meng X.R.Meng X.R.
Zhang Y.Zhang Y.
Qian X.L.Qian X.L.
Yuda T.Yuda T.
He H.H.He H.H.
Zhang Y.I.Zhang Y.I.
Shiomi A.Shiomi A.
Zhang Y.Zhang Y.
Le G.M.Le G.M.
Tateyama N.Tateyama N.
Saito T.Y.Saito T.Y.
Ozawa S.Ozawa S.
Nishizawa M.Nishizawa M.
Katayose Y.Katayose Y.
He Z.T.He Z.T.
Saito T.Saito T.
Jiang L.Jiang L.
Hibino K.Hibino K.
Munakata K.Munakata K.
Sugimoto H.Sugimoto H.
Ohta I.Ohta I.
Shao J.Shao J.
Kawata K.Kawata K.
Liu J.S.Liu J.S.