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

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

Waseda Research Institute for Science and Engineering

Research output: Chapter in Book/Report/Conference proceeding › Conference 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 language	English
Title of host publication	Proceedings of the 33rd International Cosmic Rays Conference, ICRC 2013
Publisher	Sociedade Brasileira de Fisica
Volume	2013-October
ISBN (Electronic)	9788589064293
Publication status	Published - 2013 Jan 1
Event	33rd International Cosmic Rays Conference, ICRC 2013 - Rio de Janeiro, Brazil Duration: 2013 Jul 2 → 2013 Jul 9

Other

Other	33rd International Cosmic Rays Conference, ICRC 2013
Country	Brazil
City	Rio de Janeiro
Period	13/7/2 → 13/7/9

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.

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.

Proceedings of the 33rd International Cosmic Rays Conference, ICRC 2013. Vol. 2013-October Sociedade Brasileira de Fisica, 2013.

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

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, 33rd International Cosmic Rays Conference, ICRC 2013, Rio de Janeiro, Brazil, 13/7/2.

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title = "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.",

keywords = "Anisotropy, Cosmic rays, Tibet AS Array",

author = "{THE TIBET ASγ COLLABORATION} and M. Amenomori and Bi, {X. J.} and D. Chen and Chen, {T. L.} and Chen, {W. Y.} and Cui, {S. W.} and Danzengluobu and Ding, {L. K.} and Feng, {C. F.} and Zhaoyang Feng and Feng, {Z. Y.} and Gou, {Q. B.} and Guo, {Y. Q.} and He, {H. H.} and He, {Z. T.} and K. Hibino and N. Hotta and Haibing Hu and Hu, {H. B.} and J. Huang and Jia, {H. Y.} and L. Jiang and F. Kajino and K. Kasahara and Y. Katayose and C. Kato and K. Kawata and M. Kozai and Labaciren and Le, {G. M.} and Li, {A. F.} and Li, {H. J.} and Li, {W. J.} and C. Liu and Liu, {J. S.} and Liu, {M. Y.} and H. Lu and Meng, {X. R.} and K. Mizutani and K. Munakata and H. Nanjo and M. Nishizawa and M. Ohnishi and I. Ohta and Shunsuke Ozawa and Qian, {X. L.} and Qu, {X. B.} and T. Saito and Saito, {T. Y.} and Shoji Torii",

year = "2013",

month = jan,

day = "1",

language = "English",

volume = "2013-October",

booktitle = "Proceedings of the 33rd International Cosmic Rays Conference, ICRC 2013",

publisher = "Sociedade Brasileira de Fisica",

address = "Brazil",

note = "33rd International Cosmic Rays Conference, ICRC 2013 ; Conference date: 02-07-2013 Through 09-07-2013",

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T1 - Observation of the large-scale sidereal anisotropy of the galactic cosmic ray intensity at 300 TeV with the Tibet Air Shower Array

AU - THE TIBET ASγ COLLABORATION

AU - Amenomori, M.

AU - Bi, X. J.

AU - Chen, D.

AU - Chen, T. L.

AU - Chen, W. Y.

AU - Cui, S. W.

AU - Danzengluobu,

AU - Ding, L. K.

AU - Feng, C. F.

AU - Feng, Zhaoyang

AU - Feng, Z. Y.

AU - Gou, Q. B.

AU - Guo, Y. Q.

AU - He, H. H.

AU - He, Z. T.

AU - Hibino, K.

AU - Hotta, N.

AU - Hu, Haibing

AU - Hu, H. B.

AU - Huang, J.

AU - Jia, H. Y.

AU - Jiang, L.

AU - Kajino, F.

AU - Kasahara, K.

AU - Katayose, Y.

AU - Kato, C.

AU - Kawata, K.

AU - Kozai, M.

AU - Labaciren,

AU - Le, G. M.

AU - Li, A. F.

AU - Li, H. J.

AU - Li, W. J.

AU - Liu, C.

AU - Liu, J. S.

AU - Liu, M. Y.

AU - Lu, H.

AU - Meng, X. R.

AU - Mizutani, K.

AU - Munakata, K.

AU - Nanjo, H.

AU - Nishizawa, M.

AU - Ohnishi, M.

AU - Ohta, I.

AU - Ozawa, Shunsuke

AU - Qian, X. L.

AU - Qu, X. B.

AU - Saito, T.

AU - Saito, T. Y.

AU - Torii, Shoji

PY - 2013/1/1

Y1 - 2013/1/1

N2 - 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.

AB - 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.

KW - Anisotropy

KW - Cosmic rays

KW - Tibet AS Array

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UR - http://www.scopus.com/inward/citedby.url?scp=85052324668&partnerID=8YFLogxK

M3 - Conference contribution

AN - SCOPUS:85052324668

VL - 2013-October

BT - Proceedings of the 33rd International Cosmic Rays Conference, ICRC 2013

PB - Sociedade Brasileira de Fisica

T2 - 33rd International Cosmic Rays Conference, ICRC 2013

Y2 - 2 July 2013 through 9 July 2013

ER -