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Large-scale Cosmic-ray Anisotropies with 19 yr of Data from the Pierre Auger Observatory

Journal Article · · Astrophys.J.
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  1. Adelaide U.
  2. LIP, Lisbon
  3. OATo, Turin; INFN, Turin
  4. Centro Atomico Bariloche
  5. NIKHEF, Amsterdam; Vrije U., Amsterdam; Nijmegen U., IMAPP
  6. ITeDA, Buenos Aires; U. Tech. Natl., Argentina
  7. GSSI, Aquila; INFN, Aquila; Gran Sasso
  8. Santiago de Compostela U., IGFAE
  9. GSSI, Aquila
  10. Catania U.; INFN, Catania; Catania, CSFNSM
  11. Lehman Coll.
  12. ITeDA, Buenos Aires
  13. Milan U.; INFN, Milan
  14. INFN, Naples
  15. Aachen, Tech. Hochsch.
  16. INFN, Turin; Turin U.
  17. IFM-UMSNH, Michoacan
  18. Pierre Auger Observ.
  19. INFN, Aquila; Gran Sasso; GSSI, Aquila; L'Aquila U.
  20. Prague, Inst. Phys.
  21. Colorado School of Mines
  22. LPSC, Grenoble
  23. Cracow, INP
  24. ICAS, UNSAM, Buenos Aires
  25. Rosario U.
  26. ITeDA, Buenos Aires; KIT, Karlsruhe, ETP
  27. IJCLab, Orsay
  28. KIT, Karlsruhe, SCC
  29. Campinas State U.
  30. Granada U., Theor. Phys. Astrophys.; CAFPE, Granada
  31. Vrije U., Brussels
  32. Chiapas Autonoma U.
  33. ITeDA, Buenos Aires; Natl. Tech. U., San Rafael
  34. U. Sao Paulo (main)
  35. INFN, Lecce
  36. Palacky U.
  37. INFN, Naples; Naples U.
  38. INFN, Milan; Milan, Polytech.
  39. INFN, Lecce; Salento U.
  40. Rio de Janeiro Federal U.
  41. Dortmund U.
  42. Siegen U.
  43. La Plata U.; Buenos Aires, CONICET
  44. Buenos Aires, CONICET; U. Buenos Aires
  45. ITeDA, Buenos Aires; KIT, Karlsruhe, SCC
  46. IFMT, Caceres
  47. Sao Paulo U., Sao Carlos
  48. INFN, Turin
  49. Mexico U.
  50. LIP, Lisbon; Rio de Janeiro, CBPF
  51. Rio de Janeiro, CBPF
  52. UFOP, Ouro Preto
  53. KIT, Karlsruhe, ETP; KIT, Karlsruhe, SCC
  54. NIKHEF, Amsterdam; Vrije U., Amsterdam; Nijmegen U., IMAPP; ASFYON; Amsterdam U.
  55. New York U., Courant Inst.; Rochester U.
  56. KIT, Karlsruhe, IPE
  57. Michigan Tech. U.
  58. Delaware U.
  59. Nijmegen U., IMAPP
  60. Chicago U., EFI
  61. Wuppertal U.
  62. UEFS, Feira de Santana
  63. KIT, Karlsruhe, ETP
  64. Centro Atomico Bariloche; Fermilab
  65. KIT, Karlsruhe, SCC; Vrije U., Brussels
  66. Bucharest, Inst. Space Science
  67. CEFET, Rio de Janeiro
  68. ABC Federal U.
  69. LPNHE, Paris
  70. Nova Gorica U.
  71. INFN, Catania; Catania U.; Catania, CSFNSM; Palermo U.
  72. INFN, Rome2; Rome U., Tor Vergata; INFN, Rome
  73. Charles U.
  74. Santander Industrial U.
  75. Mexico, ESFM
  76. Brussels U., IIHE
  77. Campina Grande Federal U.
  78. L'Aquila U.
  79. Hamburg U., Inst. Theor. Phys. II
  80. Buenos Aires, CONICET
  81. Bucharest U.
  82. Puebla U., Mexico
  83. INFN, Rome
  84. Sao Paulo U.
  85. KIT, Karlsruhe, SCC; Delaware U.
  86. INFN, Catania; Catania U.; Catania, CSFNSM; IASF, Palermo
  87. Vrije U., Brussels; Brussels U., IIHE
  88. Milan U.; INFN, Milan; KIT, Karlsruhe, SCC
  89. Lodz U.
  90. Medellin U.
  91. Amsterdam U.
  92. Nova Gorica U.; Stefan Inst., Ljubljana
+ Show Author Affiliations
Results are presented for the measurement of large-scale anisotropies in the arrival directions of ultra–high-energy cosmic rays detected at the Pierre Auger Observatory during 19 yr of operation, prior to AugerPrime, the upgrade of the observatory. The 3D dipole amplitude and direction are reconstructed above 4 EeV in four energy bins. Besides the established dipolar anisotropy in R.A. above 8 EeV, the Fourier amplitude of the 8–16 EeV energy bin is now also above the 5σ discovery level. No time variation of the dipole moment above 8 EeV is found, setting an upper limit to the rate of change of such variations of 0.3% yr$$^{−1}$$ at the 95% confidence level. Additionally, the results for the angular power spectrum are shown, demonstrating no other statistically significant multipoles. The results for the equatorial dipole component down to 0.03 EeV are presented, using for the first time a data set obtained with a trigger that has been optimized for lower energies. Finally, model predictions are discussed and compared with observations, based on two source emission scenarios obtained in the combined fit of spectrum and composition above 0.6 EeV.
Research Organization:
ABC Federal U.; ASFYON; Aachen, Tech. Hochsch.; Adelaide U.; Amsterdam U.; Brussels U., IIHE; Bucharest U.; Bucharest, Inst. Space Science; Buenos Aires, CONICET; CAFPE, Granada; CEFET, Rio de Janeiro; Campina Grande Federal U.; Campinas State U.; Catania U.; Catania, CSFNSM; Centro Atomico Bariloche; Charles U.; Chiapas Autonoma U.; Chicago U., EFI; Colorado School of Mines; Cracow, INP; Delaware U.; Dortmund U.; Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States); GSSI, Aquila; Gran Sasso; Granada U., Theor. Phys. Astrophys.; Hamburg U., Inst. Theor. Phys. II; IASF, Palermo; ICAS, UNSAM, Buenos Aires; IFM-UMSNH, Michoacan; IFMT, Caceres; IJCLab, Orsay; INFN, Aquila; INFN, Catania; INFN, Lecce; INFN, Milan; INFN, Naples; INFN, Rome; INFN, Rome2; INFN, Turin; ITeDA, Buenos Aires; KIT, Karlsruhe, ETP; KIT, Karlsruhe, IPE; KIT, Karlsruhe, SCC; L'Aquila U.; LIP, Lisbon; LPNHE, Paris; LPSC, Grenoble; La Plata U.; Lehman Coll.; Lodz U.; Medellin U.; Mexico U.; Mexico, ESFM; Michigan Tech. U.; Milan U.; Milan, Polytech.; NIKHEF, Amsterdam; Naples U.; Natl. Tech. U., San Rafael; New York U., Courant Inst.; Nijmegen U., IMAPP; Nova Gorica U.; OATo, Turin; Palacky U.; Palermo U.; Pierre Auger Observ.; Prague, Inst. Phys.; Puebla U., Mexico; Rio de Janeiro Federal U.; Rio de Janeiro, CBPF; Rochester U.; Rome U., Tor Vergata; Rosario U.; Salento U.; Santander Industrial U.; Santiago de Compostela U., IGFAE; Sao Paulo U.; Sao Paulo U., Sao Carlos; Siegen U.; Stefan Inst., Ljubljana; Turin U.; U. Buenos Aires; U. Sao Paulo (main); U. Tech. Natl., Argentina; UEFS, Feira de Santana; UFOP, Ouro Preto; Vrije U., Amsterdam; Vrije U., Brussels; Wuppertal U.
Sponsoring Organization:
US Department of Energy
Grant/Contract Number:
89243024CSC000002; AC02-07CH11359
OSTI ID:
2521992
Report Number(s):
FERMILAB-PUB-24-1012-V; oai:inspirehep.net:2817364; arXiv:2408.05292
Journal Information:
Astrophys.J., Journal Name: Astrophys.J. Journal Issue: 1 Vol. 976
Country of Publication:
United States
Language:
English

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79 ASTRONOMY AND ASTROPHYSICS