Zenith angle distribution of cosmic ray showers measured with the Yakutsk array and its application to the analysis of arrival directions in equatorial coordinates

被引：5
作者：
Ivanov, A. A. [1 ]
机构：
[1] Shafer Inst Cosmophys Res & Aeron, Yakutsk 677980, Russia
来源：
PHYSICAL REVIEW D | 2018年 / 97卷 / 08期
关键词：
EXTENSIVE AIR-SHOWERS; ENERGY-SPECTRUM; CHERENKOV LIGHT; EAS ARRAY; ANISOTROPY; KASCADE; MODEL;
D O I：
10.1103/PhysRevD.97.083003
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
The Yakutsk array data set in the energy interval (10(17), 10(19)) eV is revisited in order to interpret the zenith angle distribution of an extensive air shower event rate of ultra-high-energy cosmic rays. The close relation of the distribution to the attenuation of the main measurable parameter of showers, rho(600), is examined. Measured and expected distributions are used to analyze the arrival directions of cosmic rays on an equatorial map including the energy range below 10(18) eV, which was previously avoided due to the reduced trigger efficiency of the array in the range. While the null hypothesis cannot be rejected with data from the Yakutsk array, an upper limit on the fraction of cosmic rays from a separable source in the uniform background is derived as a function of declination and energy.
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页数：9
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