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Large-scale cosmic-ray anisotropies above 4 EeV measured by the Pierre Auger Observatory

Journal Article · · Astrophys.J.
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  1. Nijmegen U., IMAPP
  2. LIP, Lisbon
  3. Turin Observ.; INFN, Turin
  4. Sao Paulo U.
  5. Adelaide U.
  6. Centro Atomico Bariloche
  7. ITeDA, Buenos Aires; U. Tech. Natl., Argentina
  8. Mexico U.
  9. Santiago de Compostela U.
  10. INFN, Aquila; Gran Sasso
  11. Lehman Coll.
  12. ITeDA, Buenos Aires
  13. INFN, Naples
  14. Centro Atomico Bariloche; Cantabria U., Santander
  15. Pierre Auger Observ.
  16. Bucharest, Polytechnic Inst.
  17. Bucharest, IFIN-HH
  18. Naples U.; INFN, Naples
  19. KIT, Karlsruhe, IKP
  20. Wuppertal U.
  21. LPSC, Grenoble
  22. Turin U.; INFN, Turin
  23. Bonn, Max Planck Inst., Radioastron.
  24. Orsay, IPN
  25. Prague, Inst. Phys.
  26. Salento U.; INFN, Lecce
  27. Rio de Janeiro Federal U.
  28. Cracow, INP
  29. ITeDA, Buenos Aires; KIT, Karlsruhe, IKP
  30. Colorado State U.
  31. Aachen, Tech. Hochsch.
  32. KIT, Karlsruhe, ETP
  33. Siegen U.
  34. Granada U., Theor. Phys. Astrophys.
  35. Vrije U., Brussels
  36. Catania U.; INFN, Catania
  37. Chiapas Autonoma U.
  38. Milan U.
  39. La Plata U.
  40. U. Tech. Natl., Argentina; ITeDA, Buenos Aires
  41. Nijmegen U., IMAPP; NIKHEF, Amsterdam
  42. U. Sao Paulo (main)
  43. INFN, Lecce
  44. Campinas State U.
  45. Palacky U.
  46. Natl. Tech. U., San Rafael
  47. Penn State U.
  48. INFN, Milan; Milan Polytechnic
  49. Case Western Reserve U.
  50. Buenos Aires, IAFE; Buenos Aires U.
  51. Niteroi, Fluminense U.
  52. Rio de Janeiro Federal U.; Valongo Observ.
  53. Sao Paulo U., Sao Carlos
  54. Parana U.
  55. Hamburg U., Inst. Theor. Phys. II
  56. Fermilab
  57. Nijmegen U., IMAPP; ASTRON, Dwingeloo; NIKHEF, Amsterdam
  58. Chicago U., EFI
  59. New York U.
  60. KIT, Karlsruhe, IPE
  61. Stefan Inst., Ljubljana; Nova Gorica U.
  62. IFIR, Rosario
  63. Rio de Janeiro Federal U.; Rio de Janeiro, CBPF
  64. INFN, Milan
  65. U. Lodz (main)
  66. Centro Atomico Bariloche; KIT, Karlsruhe, IKP
  67. UEFS, Feira de Santana
  68. INFN, Turin; Turin U.
  69. KIT, Karlsruhe, ETP; ITeDA, Buenos Aires
  70. KIT, Karlsruhe, IKP; Vrije U., Brussels
  71. Bucharest, Inst. Space Science
  72. Colorado School of Mines
  73. Nova Gorica U.
  74. ABC Federal U.
  75. Paris U., VI-VII
  76. Puebla U., Inst. Fis.
  77. Milan U.; INFN, Milan
  78. Brussels U.
  79. CINVESTAV, IPN
  80. Louisiana State U.
  81. Rome U., Tor Vergata; INFN, Rome2
  82. INFN, Turin
  83. Michigan Tech. U.
  84. Charles U.
  85. Cantabria U., Santander
  86. LIDAR CITEFA
  87. UPII, IPN
  88. L'Aquila U.; Gran Sasso
  89. Buenos Aires, IAFE
  90. INFN, Rome2
  91. Groningen, KVI; Vrije U., Brussels
  92. Rio de Janeiro, CBPF
  93. Nebraska U.
  94. Medellin U.
  95. NIKHEF, Amsterdam; Nijmegen U., IMAPP
  96. Groningen, KVI
  97. Valongo Observ.
  98. Leeds U.
  99. Nova Gorica U.; Stefan Inst., Ljubljana
+ Show Author Affiliations
We present a detailed study of the large-scale anisotropies of cosmic rays with energies above 4 EeV measured using the Pierre Auger Observatory. For the energy bins [4, 8] EeV and E ≥ 8 EeV, the most significant signal is a dipolar modulation in R.A. at energies above 8 EeV, as previously reported. In this paper we further scrutinize the highest-energy bin by splitting it into three energy ranges. We find that the amplitude of the dipole increases with energy above 4 EeV. The growth can be fitted with a power law with index β = 0.79 ± 0.19. The directions of the dipoles are consistent with an extragalactic origin of these anisotropies at all the energies considered. Additionally, we have estimated the quadrupolar components of the anisotropy: they are not statistically significant. We discuss the results in the context of the predictions from different models for the distribution of ultrahigh-energy sources and cosmic magnetic fields.
Research Organization:
ABC Federal U.; ASTRON, Dwingeloo; Aachen, Tech. Hochsch.; Adelaide U.; Bonn, Max Planck Inst., Radioastron.; Brussels U.; Bucharest, IFIN-HH; Bucharest, Inst. Space Science; Bucharest, Polytechnic Inst.; Buenos Aires U.; Buenos Aires, IAFE; CINVESTAV, IPN; Campinas State U.; Cantabria U., Santander; Case Western Reserve U.; Catania U.; Centro Atomico Bariloche; Charles U.; Chiapas Autonoma U.; Chicago U., EFI; Colorado School of Mines; Colorado State U.; Cracow, INP; Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States); Gran Sasso; Granada U., Theor. Phys. Astrophys.; Groningen, KVI; Hamburg U., Inst. Theor. Phys. II; IFIR, Rosario; INFN, Aquila; INFN, Catania; INFN, Lecce; INFN, Milan; INFN, Naples; INFN, Rome2; INFN, Turin; ITeDA, Buenos Aires; KIT, Karlsruhe, ETP; KIT, Karlsruhe, IKP; KIT, Karlsruhe, IPE; L'Aquila U.; LIDAR CITEFA; LIP, Lisbon; LPSC, Grenoble; La Plata U.; Leeds U.; Lehman Coll.; Louisiana State U.; Medellin U.; Mexico U.; Michigan Tech. U.; Milan Polytechnic; Milan U.; NIKHEF, Amsterdam; Naples U.; Natl. Tech. U., San Rafael; Nebraska U.; New York U.; Nijmegen U., IMAPP; Niteroi, Fluminense U.; Nova Gorica U.; Orsay, IPN; Palacky U.; Parana U.; Paris U., VI-VII; Penn State U.; Pierre Auger Observ.; Prague, Inst. Phys.; Puebla U., Inst. Fis.; Rio de Janeiro Federal U.; Rio de Janeiro, CBPF; Rome U., Tor Vergata; Salento U.; Santiago de Compostela U.; Sao Paulo U.; Sao Paulo U., Sao Carlos; Siegen U.; Stefan Inst., Ljubljana; Turin Observ.; Turin U.; U. Lodz (main); U. Sao Paulo (main); U. Tech. Natl., Argentina; UEFS, Feira de Santana; UPII, IPN; Valongo Observ.; Vrije U., Brussels; Wuppertal U.
Sponsoring Organization:
US Department of Energy
Grant/Contract Number:
AC02-07CH11359
OSTI ID:
1487066
Report Number(s):
FERMILAB-PUB-18-393-ND-PPD-TD; oai:inspirehep.net:1686364; arXiv:1808.03579
Journal Information:
Astrophys.J., Journal Name: Astrophys.J. Journal Issue: 1 Vol. 868
Country of Publication:
United States
Language:
English

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Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
astroparticle physics
cosmic rays