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Evidence for a Supergalactic Structure of Magnetic Deflection Multiplets of Ultra-high-energy Cosmic Rays

2020; IOP Publishing; Volume: 899; Issue: 1 Linguagem: Inglês

10.3847/1538-4357/aba26c

1538-4357

Rasha Abbasi, Mitsuru Abe, T. Abu‐Zayyad, M. Allen, R. Azuma, E. Barcikowski, John Belz, D. R. Bergman, S. A. Blake, R. Cady, B. G. Cheon, J. Chiba, M. Chikawa, Armando di Matteo, Toshihiro Fujii, Kozo Fujisue, K. Fujita, Ryota Fujiwara, M. Fukushima, G. Furlich, W. Hanlon, Motoki Hayashi, N. Hayashida, K. Hibino, R. Higuchi, K. Honda, D. Ikeda, Taichi Inadomi, Naoko Inoue, Takaaki Ishii, R. Ishimori, Hirotaka Ito, D. Ivanov, Hirokazu Iwakura, Hyeonju Jeong, S. Jeong, C. C. H. Jui, K. Kadota, F. Kakimoto, O. Kalashev, K. Kasahara, Saori Kasami, H. Kawai, S. Kawakami, S. Kawana, K. Kawata, E. Kido, Jihyun Kim, J. H. Kim, Jihyun Kim, M. H. Kim, S. W. Kim, S. Kishigami, V. Kuzmin, M. Kuznetsov, Y.-J. Kwon, K. H. Lee, Б. Лубсандоржиев, Jon Paul Lundquist, K. Machida, Hiroyuki Matsumiya, T. Matsuyama, J. N. Matthews, R. Mayta, M. Minamino, K. Mukai, I. Myers, Shigehiro Nagataki, Kei Nakai, R. Nakamura, T. Nakamura, Yuya Nakamura, T. Nonaka, Hiroyuki Oda, S. Ogio, M. Ohnishi, H. Ohoka, Yuya Oku, T. Okuda, Y. Omura, M. Ono, R. Onogi, A. Oshima, S. Ozawa, Il Han Park, М. С. Пширков, Jackson Remington, D. C. Rodriguez, Г. Рубцов, Dongsu Ryu, H. Sagawa, Ryosuke Sahara, Yasunori Saito, Н. Сакаки, T. Sako, N. Sakurai, Kei Sano, T. Seki, K. Sekino, P. D. Shah, F. Shibata, T. Shibata, Hidetoshi Shimodaira, B. K. Shin, H. S. Shin, J. D. Smith, P. Sokolsky, Naohiro Sone, B. T. Stokes, T. A. Stroman, T. Suzawa, Y. Takagi, Yoshiyuki Takahashi, M. Takamura, Ryuji Takeishi, A. Taketa, M. Takita, Y. Tameda, H. Tanaka, K. Tanaka, M. Tanaka, Yuta Tanoue, S. B. Thomas, G. B. Thomson, P. Tinyakov, I. Tkachev, H. Tokuno, T. Tomida, S. Troitsky, Y. Tsunesada, Y. Uchihori, S. Udo, Takafumi Uehama, F. Urban, Tony Wong, Kohei Yada, M. Yamamoto, K. Yamazaki, J. Yang, K. Yashiro, M. Yosei, Yana Zhezher, Z. Zundel,

Radio Astronomy Observations and Technology

Abstract Evidence for a large-scale supergalactic cosmic-ray multiplet (arrival directions correlated with energy) structure is reported for ultra-high-energy cosmic-ray (UHECR) energies above 10 19 eV using 7 years of data from the Telescope Array (TA) surface detector and updated to 10 years. Previous energy–position correlation studies have made assumptions regarding magnetic field shapes and strength, and UHECR composition. Here the assumption tested is that, because the supergalactic plane is a fit to the average matter density of the local large-scale structure, UHECR sources and intervening extragalactic magnetic fields are correlated with this plane. This supergalactic deflection hypothesis is tested by the entire field-of-view (FOV) behavior of the strength of intermediate-scale energy–angle correlations. These multiplets are measured in spherical cap section bins (wedges) of the FOV to account for coherent and random magnetic fields. The structure found is consistent with supergalactic deflection, the previously published energy spectrum anisotropy results of the TA (the Hotspot and Coldspot), and toy-model simulations of a supergalactic magnetic sheet. The seven year data posttrial significance of this supergalactic structure of multiplets appearing by chance, on an isotropic sky, is found by Monte Carlo simulation to be 4.2 σ . The 10 years of data posttrial significance is 4.1 σ . Furthermore, the starburst galaxy M82 is shown to be a possible source of the TA Hotspot, and an estimate of the supergalactic magnetic field using UHECR measurements is presented.