LARGE-SCALE DISTRIBUTION OF ARRIVAL DIRECTIONS OF COSMIC RAYS DETECTED ABOVE 10{sup 18} eV AT THE PIERRE AUGER OBSERVATORY

Journal Article · Sat Dec 15 00:00:00 EST 2012 · Astrophysical Journal, Supplement Series

DOI:https://doi.org/10.1088/0067-0049/203/2/34· OSTI ID:22089748

Abreu, P.; Andringa, S. ^[1]; Aglietta, M. ^[2]; Ahlers, M. ^[3]; Ahn, E. J. ^[4]; Albuquerque, I. F. M. ^[5]; Allard, D. ^[6]; Allekotte, I. ^[7]; Allen, J. ^[8]; Allison, P. ^[9]; Almela, A. ^[10]; Alvarez Castillo, J. ^[11]; Alvarez-Muniz, J. ^[12]; Alves Batista, R. ^[13]; Ambrosio, M.; Aramo, C. ^[14]; Aminaei, A. ^[15]; Anchordoqui, L. ^[16]; Antici'c, T. ^[17]; Arganda, E. ^[18] ; others, and

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1. LIP and Instituto Superior Tecnico, Technical University of Lisbon (Portugal)
2. Istituto di Fisica dello Spazio Interplanetario (INAF), Universita di Torino and Sezione INFN, Torino (Italy)
3. University of Wisconsin, Madison, WI (United States)
4. Fermilab, Batavia, IL (United States)
5. Instituto de Fisica, Universidade de Sao Paulo, Sao Paulo, SP (Brazil)
6. Laboratoire AstroParticule et Cosmologie (APC), Universite Paris 7, CNRS-IN2P3, Paris (France)
7. Centro Atomico Bariloche and Instituto Balseiro (CNEA-UNCuyo-CONICET), San Carlos de Bariloche (Argentina)
8. New York University, New York, NY (United States)
9. Ohio State University, Columbus, OH (United States)
10. Facultad Regional Buenos Aires, Universidad Tecnologica Nacional, Buenos Aires (Argentina)
11. Universidad Nacional Autonoma de Mexico, Mexico, D. F. (Mexico)
12. Universidad de Santiago de Compostela (Spain)
13. IFGW, Universidade Estadual de Campinas, Campinas, SP (Brazil)
14. Universita di Napoli 'Federico II' and Sezione INFN, Napoli (Italy)
15. IMAPP, Radboud University Nijmegen (Netherlands)
16. University of Wisconsin, Milwaukee, WI (United States)
17. Rudjer Boskovi'c Institute, 10000 Zagreb (Croatia)
18. IFLP, Universidad Nacional de La Plata and CONICET, La Plata (Argentina)

A thorough search for large-scale anisotropies in the distribution of arrival directions of cosmic rays detected above 10{sup 18} eV at the Pierre Auger Observatory is presented. This search is performed as a function of both declination and right ascension in several energy ranges above 10{sup 18} eV, and reported in terms of dipolar and quadrupolar coefficients. Within the systematic uncertainties, no significant deviation from isotropy is revealed. Assuming that any cosmic-ray anisotropy is dominated by dipole and quadrupole moments in this energy range, upper limits on their amplitudes are derived. These upper limits allow us to test the origin of cosmic rays above 10{sup 18} eV from stationary Galactic sources densely distributed in the Galactic disk and predominantly emitting light particles in all directions.

• OSTI ID: 22089748
• Journal Information: Astrophysical Journal, Supplement Series, Vol. 203, Issue 2; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 0067-0049
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
AMPLITUDES
ANISOTROPY
ASTROPHYSICS
COSMIC RADIATION
COSMIC RAY DETECTION
COSMIC RAY PROPAGATION
DIPOLES
EEV RANGE
ISOTROPY
MILKY WAY
QUADRUPOLE MOMENTS
VISIBLE RADIATION