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Large-scale sidereal anisotropy of galactic cosmic-ray intensity observed by the Tibet air shower array
Tibet ASgamma Collaboration
2005
发表期刊ASTROPHYSICAL JOURNAL
卷号626期号:1页码:L29-L32
通讯作者Amenomori, M (reprint author), Hirosaki Univ, Dept Phys, Hirosaki, Aomori 0368561, Japan.
摘要We present the large-scale sidereal anisotropy of Galactic cosmic-ray intensity in the multi-TeV region observed with the Tibet-III air shower array during the period from 1999 through 2003. The sidereal daily variation of cosmic rays observed in this experiment shows an excess of relative intensity around 4-7 hr local sidereal time as well as a deficit around 12 hr local sidereal time. While the amplitude of the excess is not significant when averaged over all declinations, the excess in individual declination bands becomes larger and clearer as the viewing direction moves toward the south. The maximum phase of the excess intensity changes from ∼ 7 hr at the Northern Hemisphere to ∼ 4 hr at the equatorial region. We also show that both the amplitude and the phase of the first harmonic vector of the daily variation are remarkably independent of primary energy in the multi-TeV region. This is the first result determining the energy and declination dependences of the full 24 hr profiles of the sidereal daily variation in the multi-TeV region with a single air shower experiment.
关键词GAMMA-RAYS
学科领域Astronomy & Astrophysics
DOI10.1086/431582
收录类别SCI
语种英语
WOS类目Astronomy & Astrophysics
WOS记录号WOS:000229532500007
引用统计
文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/212558
专题粒子天体物理中心
作者单位中国科学院高能物理研究所
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Tibet ASgamma Collaboration. Large-scale sidereal anisotropy of galactic cosmic-ray intensity observed by the Tibet air shower array[J]. ASTROPHYSICAL JOURNAL,2005,626(1):L29-L32.
APA Tibet ASgamma Collaboration.(2005).Large-scale sidereal anisotropy of galactic cosmic-ray intensity observed by the Tibet air shower array.ASTROPHYSICAL JOURNAL,626(1),L29-L32.
MLA Tibet ASgamma Collaboration."Large-scale sidereal anisotropy of galactic cosmic-ray intensity observed by the Tibet air shower array".ASTROPHYSICAL JOURNAL 626.1(2005):L29-L32.
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