Observation of Declination Dependence in the Cosmic Ray Energy Spectrum
The Telescope Array Collaboration,R. U. Abbasi,T. Abu-Zayyad,M. Allen,J. W. Belz,D. R. Bergman,I. Buckland,W. Campbell,B. G. Cheon,K. Endo,A. Fedynitch,T. Fujii,K. Fujisue,K. Fujita,M. Fukushima,G. Furlich,Z. Gerber,N. Globus,W. Hanlon,N. Hayashida,H. He,K. Hibino,R. Higuchi,D. Ikeda,T. Ishii,D. Ivanov,S. Jeong,C. C. H. Jui,K. Kadota,F. Kakimoto,O. Kalashev,K. Kasahara,Y. Kawachi,K. Kawata,I. Kharuk,E. Kido,H. B. Kim,J. H. Kim,J. H. Kim,S. W. Kim,R. Kobo,I. Komae,K. Komatsu,K. Komori,C. Koyama,M. Kudenko,M. Kuroiwa,Y. Kusumori,M. Kuznetsov,Y. J. Kwon,K. H. Lee,M. J. Lee,B. Lubsandorzhiev,J. P. Lundquist,A. Matsuzawa,J. A. Matthews,J. N. Matthews,K. Mizuno,M. Mori,M. Murakami,S. Nagataki,M. Nakahara,T. Nakamura,T. Nakayama,Y. Nakayama,T. Nonaka,S. Ogio,H. Ohoka,N. Okazaki,M. Onishi,A. Oshima,H. Oshima,S. Ozawa,I. H. Park,K. Y. Park,M. Potts,M. Przybylak,M. S. Pshirkov,J. Remington,C. Rott,G. I. Rubtsov,D. Ryu,H. Sagawa,N. Sakaki,R. Sakamoto,T. Sako,N. Sakurai,S. Sakurai,D. Sato,S. Sato,K. Sekino,T. Shibata,J. Shikita,H. Shimodaira,B. K. Shin,H. S. Shin,K. Shinozaki,J. D. Smith,P. Sokolsky,B. T. Stokes,T. A. Stroman,Y. Takagi,K. Takahashi,M. Takeda,R. Takeishi,A. Taketa,M. Takita,Y. Tameda,K. Tanaka,M. Tanaka,S. B. Thomas,G. B. Thomson,P. Tinyakov,I. Tkachev,T. Tomida,S. Troitsky,Y. Tsunesada,S. Udo,F. Urban,I. A. Vaiman,M. Vrábel,D. Warren,K. Yamazaki,Y. Zhezher,Z. Zundel,J. Zvirzdin
arxiv(2024)
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Abstract
We report on an observation of the difference between northern and southern
skies of the ultrahigh energy cosmic ray energy spectrum with a significance of
∼8σ. We use measurements from the two largest
experimentsx2014the Telescope Array observing the northern
hemisphere and the Pierre Auger Observatory viewing the southern hemisphere.
Since the comparison of two measurements from different observatories
introduces the issue of possible systematic differences between detectors and
analyses, we validate the methodology of the comparison by examining the region
of the sky where the apertures of the two observatories overlap. Although the
spectra differ in this region, we find that there is only a 1.8σ
difference between the spectrum measurements when anisotropic regions are
removed and a fiducial cut in the aperture is applied.
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