@article{31ef3baaab184612a8f30d945b8d546b,

title = "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",

abstract = "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.",

keywords = "Astroparticle physics, Cosmic rays",

author = "{The Pierre Auger Collaboration} and {The Telescope Array Collaboration} and A. Aab and P. Abreu and M. Aglietta and Ahn, {E. J.} and {Al Samarai}, I. and Albuquerque, {I. F M} and I. Allekotte and J. Allen and P. Allison and A. Almela and Castillo, {J. Alvarez} and J. Alvarez-Mu{\~n}iz and Batista, {R. Alves} and M. Ambrosio and A. Aminaei and L. Anchordoqui and S. Andringa and C. Aramo and F. Arqueros and H. Asorey and P. Assis and J. Aublin and M. Ave and M. Avenier and G. Avila and Badescu, {A. M.} and Barber, {K. B.} and J. B{\"a}uml and C. Baus and Beatty, {J. J.} and Becker, {K. H.} and Bellido, {J. A.} and C. Berat and Bertaina, {M. E.} and X. Bertou and Biermann, {P. L.} and P. Billoir and M. Blanco and C. Bleve and H. Bl{\"u}mer and M. Boh{\'a}{\v c}ov{\'a} and D. Boncioli and C. Bonifazi and R. Bonino and N. Borodai and J. Brack and I. Brancus and P. Brogueira and Brown, {W. C.} and Shunsuke Ozawa",

year = "2014",

month = oct,

day = "20",

doi = "10.1088/0004-637X/794/2/172",

language = "English",

volume = "794",

journal = "Astrophysical Journal",

issn = "0004-637X",

publisher = "IOP Publishing Ltd.",

number = "2",

}