Searches for large-scale anisotropy in the arrival directions of cosmic rays detected above energy of 1019 eV at the Pierre auger observatory and the telescope array

The Pierre Auger Collaboration, The Telescope Array Collaboration

研究成果: Article査読

31 被引用数 (Scopus)

抄録

Spherical harmonic moments are well-suited for capturing anisotropy at any scale in the flux of cosmic rays. An unambiguous measurement of the full set of spherical harmonic coefficients requires full-sky coverage. This can be achieved by combining data from observatories located in both the northern and southern hemispheres. To this end, a joint analysis using data recorded at the Telescope Array and the Pierre Auger Observatory above 1019 eV is presented in this work. The resulting multipolar expansion of the flux of cosmic rays allows us to perform a series of anisotropy searches, and in particular to report on the angular power spectrum of cosmic rays above 1019 eV. No significant deviation from isotropic expectations is found throughout the analyses performed. Upper limits on the amplitudes of the dipole and quadrupole moments are derived as a function of the direction in the sky, varying between 7% and 13% for the dipole and between 7% and 10% for a symmetric quadrupole.

本文言語English
論文番号794
ジャーナルAstrophysical Journal
794
2
DOI
出版ステータスPublished - 2014 10 20

ASJC Scopus subject areas

  • 天文学と天体物理学
  • 宇宙惑星科学

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