Observation of Declination Dependence in the Cosmic Ray Energy Spectrum
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 . We use measurements from the two largest experimentsthe 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 difference between the spectrum measurements when anisotropic regions are removed and a fiducial cut in the aperture is applied.
Cite
@article{arxiv.2406.08612,
title = {Observation of Declination Dependence in the Cosmic Ray Energy Spectrum},
author = {The Telescope Array Collaboration and R. U. Abbasi and T. Abu-Zayyad and M. Allen and J. W. Belz and D. R. Bergman and I. Buckland and W. Campbell and B. G. Cheon and K. Endo and A. Fedynitch and T. Fujii and K. Fujisue and K. Fujita and M. Fukushima and G. Furlich and Z. Gerber and N. Globus and W. Hanlon and N. Hayashida and H. He and K. Hibino and R. Higuchi and D. Ikeda and T. Ishii and D. Ivanov and S. Jeong and C. C. H. Jui and K. Kadota and F. Kakimoto and O. Kalashev and K. Kasahara and Y. Kawachi and K. Kawata and I. Kharuk and E. Kido and H. B. Kim and J. H. Kim and J. H. Kim and S. W. Kim and R. Kobo and I. Komae and K. Komatsu and K. Komori and C. Koyama and M. Kudenko and M. Kuroiwa and Y. Kusumori and M. Kuznetsov and Y. J. Kwon and K. H. Lee and M. J. Lee and B. Lubsandorzhiev and J. P. Lundquist and A. Matsuzawa and J. A. Matthews and J. N. Matthews and K. Mizuno and M. Mori and M. Murakami and S. Nagataki and M. Nakahara and T. Nakamura and T. Nakayama and Y. Nakayama and T. Nonaka and S. Ogio and H. Ohoka and N. Okazaki and M. Onishi and A. Oshima and H. Oshima and S. Ozawa and I. H. Park and K. Y. Park and M. Potts and M. Przybylak and M. S. Pshirkov and J. Remington and C. Rott and G. I. Rubtsov and D. Ryu and H. Sagawa and N. Sakaki and R. Sakamoto and T. Sako and N. Sakurai and S. Sakurai and D. Sato and S. Sato and K. Sekino and T. Shibata and J. Shikita and H. Shimodaira and B. K. Shin and H. S. Shin and K. Shinozaki and J. D. Smith and P. Sokolsky and B. T. Stokes and T. A. Stroman and Y. Takagi and K. Takahashi and M. Takeda and R. Takeishi and A. Taketa and M. Takita and Y. Tameda and K. Tanaka and M. Tanaka and S. B. Thomas and G. B. Thomson and P. Tinyakov and I. Tkachev and T. Tomida and S. Troitsky and Y. Tsunesada and S. Udo and F. Urban and I. A. Vaiman and M. Vrábel and D. Warren and K. Yamazaki and Y. Zhezher and Z. Zundel and J. Zvirzdin},
journal= {arXiv preprint arXiv:2406.08612},
year = {2024}
}
Comments
8 pages, 6 figures