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arxiv: 1809.01573 · v2 · submitted 2018-09-05 · 🌌 astro-ph.HE

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Testing a reported correlation between arrival directions of ultrahigh-energy cosmic rays and a flux pattern from nearby starburst galaxies using Telescope Array data

Telescope Array Collaboration: R.U. Abbasi (1) , M. Abe (2) , T. Abu-Zayyad (1) , M. Allen (1) , R. Azuma (3) , E. Barcikowski (1) , J.W. Belz (1) , D.R. Bergman (1)
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S.A. Blake (1) R. Cady (1) B.G. Cheon (4) J. Chiba (5) M. Chikawa (6) A. Di Matteo (7) T. Fujii (8) K. Fujita (9) M. Fukushima (8 10) G. Furlich (1) T. Goto (9) W. Hanlon (1) M. Hayashi (11) Y. Hayashi (9) N. Hayashida (12) K. Hibino (12) K. Honda (13) D. Ikeda (8) N. Inoue (2) T. Ishii (13) R. Ishimori (3) H. Ito (14) D. Ivanov (1) H.M. Jeong (15) S. Jeong (15) C.C.H. Jui (1) K. Kadota (16) F. Kakimoto (3) O. Kalashev (17) K. Kasahara (18) H. Kawai (19) S. Kawakami (9) S. Kawana (2) K. Kawata (8) E. Kido (8) H.B. Kim (4) J.H. Kim (1) J.H. Kim (20) S. Kishigami (9) S. Kitamura (3) Y. Kitamura (3) V. Kuzmin (17) M. Kuznetsov (17) Y.J. Kwon (21) K.H. Lee (15) B. Lubsandorzhiev (17) J.P. Lundquist (1) K. Machida (13) K. Martens (10) T. Matsuyama (9) J.N. Matthews (1) R. Mayta (9) M. Minamino (9) K. Mukai (13) I. Myers (1) K. Nagasawa (2) S. Nagataki (14) R. Nakamura (22) T. Nakamura (23) T. Nonaka (8) H. Oda (9) S. Ogio (9) J. Ogura (3) M. Ohnishi (8) H. Ohoka (8) T. Okuda (24) Y. Omura (9) M. Ono (14) R. Onogi (9) A. Oshima (9) S. Ozawa (18) I.H. Park (15) M.S. Pshirkov (17 25) J. Remington (1) D.C. Rodriguez (1) G. Rubtsov (17) D. Ryu (20) H. Sagawa (8) R. Sahara (9) K. Saito (8) Y. Saito (22) N. Sakaki (8) N. Sakurai (9) L.M. Scott (26) T. Seki (22) K. Sekino (8) P.D. Shah (1) F. Shibata (13) T. Shibata (8) H. Shimodaira (8) B.K. Shin (9) H.S. Shin (8) J.D. Smith (1) P. Sokolsky (1) B.T. Stokes (1) S.R. Stratton (1 26) T.A. Stroman (1) T. Suzawa (2) Y. Takagi (9) Y. Takahashi (9) M. Takamura (5) M. Takeda (8) R. Takeishi (15) A. Taketa (27) M. Takita (8) Y. Tameda (28) H. Tanaka (9) K. Tanaka (29) M. Tanaka (30) S.B. Thomas (1) G.B. Thomson (1) P. Tinyakov (7 17) I. Tkachev (17) H. Tokuno (3) T. Tomida (22) S. Troitsky (17) Y. Tsunesada (9) K. Tsutsumi (3) Y. Uchihori (31) S. Udo (12) F. Urban (32) T. Wong (1) M. Yamamoto (22) R. Yamane (9) H. Yamaoka (30) K. Yamazaki (12) J. Yang (33) K. Yashiro (5) Y. Yoneda (9) S. Yoshida (19) H. Yoshii (34) Y. Zhezher (17) Z. Zundel (1) ((1) High Energy Astrophysics Institute Department of Physics Astronomy University of Utah Salt Lake City Utah USA (2) The Graduate School of Science Engineering Saitama University Saitama Japan (3) Graduate School of Science Tokyo Institute of Technology Meguro Tokyo (4) Department of Physics The Research Institute of Natural Science Hanyang University Seongdong-gu Seoul Korea (5) Department of Physics Tokyo University of Science Noda Chiba (6) Department of Physics Kindai University Higashi Osaka Osaka (7) Service de Physique Libre de Bruxelles Brussels Belgium (8) Institute for Cosmic Ray Research University of Tokyo Kashiwa (9) Graduate School of Science Osaka City University (10) Kavli Institute for the Physics Mathematics of the Universe (WPI) Todai Institutes for Advanced Study (11) Information Engineering Graduate School of Science Technology Shinshu University Nagano (12) Faculty of Engineering Kanagawa University Yokohama Kanagawa (13) Interdisciplinary Graduate School of Medicine University of Yamanashi Kofu Yamanashi (14) Astrophysical Big Bang Laboratory RIKEN Wako (15) Department of Physics Sungkyunkwan University Jang-an-gu Suwon (16) Department of Physics Tokyo City University Setagaya-ku (17) Institute for Nuclear Research of the Russian Academy of Sciences Moscow Russia (18) Advanced Research Institute for Science Waseda University Shinjuku-ku (19) Department of Physics Chiba University (20) Department of Physics School of Natural Sciences Ulsan National Institute of Science UNIST-gil Ulsan (21) Department of Physics Yonsei University Seodaemun-gu (22) Academic Assembly School of Science Technology Institute of Engineering (23) Faculty of Science Kochi University Kochi (24) Department of Physical Sciences Ritsumeikan University Kusatsu Shiga (25) Sternberg Astronomical Institute Moscow M.V. Lomonosov State University (26) Department of Physics Rutgers University - The State University of New Jersey Piscataway New Jersey (27) Earthquake Research Institute Bunkyo-ku (28) Department of Engineering Science Faculty of Engineering Osaka Electro-Communication University Neyagawa-shi (29) Graduate School of Information Sciences Hiroshima City University Hiroshima (30) Institute of Particle Nuclear Studies KEK Tsukuba Ibaraki (31) National Institute of Radiological Science (32) CEICO Institute of Physics Czech Academy of Sciences Prague Czech Republic (33) Department of Physics Institute for the Early Universe Ewha Womans University Seodaaemun-gu (34) Department of Physics Ehime University Matsuyama Ehime Japan)
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classification 🌌 astro-ph.HE
keywords augercosmicraysarrayarrivalcorrelationdatadirections
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The Pierre Auger Collaboration (Auger) recently reported a correlation between the arrival directions of cosmic rays with energies above 39 EeV and the flux pattern of 23 nearby starburst galaxies (SBGs). In this Letter, we tested the same hypothesis using cosmic rays detected by the Telescope Array experiment (TA) in the 9-year period from May 2008 to May 2017. Unlike the Auger analysis, we did not optimize the parameter values but kept them fixed to the best-fit values found by Auger, namely 9.7% for the anisotropic fraction of cosmic rays assumed to originate from the SBGs in the list and 12.9{\deg} for the angular scale of the correlations. The energy threshold we adopted is 43 EeV, corresponding to 39 EeV in Auger when taking into account the energy-scale difference between two experiments. We find that the TA data is compatible with isotropy to within 1.1{\sigma} and with the Auger result to within 1.4{\sigma}, meaning that it is not capable to discriminate between these two hypotheses.

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