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

A. A. Ivanov*

  • Shafer Institute for Cosmophysical Research and Aeronomy, Yakutsk 677980, Russia

  • *ivanov@ikfia.ysn.ru
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Phys. Rev. D 97, 083003 – Published 10 April, 2018

DOI: https://doi.org/10.1103/PhysRevD.97.083003

Abstract

The Yakutsk array data set in the energy interval (1017,1019)  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, ρ600, 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 1018  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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Phys. Rev. D 97, 083003– Published 10 April, 2018
  • Received 17 January 2018
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