We present the results of searches for dipolar-type anisotropies in different energy ranges above 2.5 x 10(17) eV with the surface detector array of the Pierre Auger Observatory, reporting on both the phase and the amplitude measurements of the first harmonic modulation in the right-ascension distribution. Upper limits on the amplitudes are obtained, which provide the most stringent bounds at present, being below 2% at 99% C.L. for EeV energies. We also compare our results to those of previous experiments as well as with some theoretical expectations. (C) 2011 Elsevier B.V. All rights reserved. RI Caramete, Laurentiu/C-2328-2011; Dutan, Ioana/C-2337-2011; Aramo, Carla/D-4317-2011; Beatty, James/D-9310-2011; Pesce, Roberto/G-5791-2011; Kemp, Ernesto/H-1502-2011; Chiavassa, Andrea/A-7597-2012; Verzi, Valerio/B-1149-2012; Chinellato, Carola Dobrigkeit /F-2540-2011; Fauth, Anderson/F-9570-2012; Todero Peixoto, Carlos Jose/G-3873-2012; de souza, Vitor/D-1381-2012; Shellard, Ronald/G-4825-2012; Petrolini, Alessandro/H-3782-2011; Albuquerque, Ivone/H-4645-2012; Muller, Marcio Aparecido/H-9112-2012; D'Urso, Domenico/I-5325-2012; Bleve, Carla/J-2521-2012; martello, daniele/J-3131-2012; Valino, Ines/J-8324-2012; Brogueira, Pedro/K-3868-2012; Chinellato, Jose Augusto/I-7972-2012; Falcke, Heino/H-5262-2012; Ebr, Jan/H-8319-2012; Anjos, Joao/C-8335-2013; Sarkar, Subir/G-5978-2011 OI Shellard, Ronald/0000-0002-2983-1815; D'Urso, Domenico/0000-0002-8215-4542; Brogueira, Pedro/0000-0001-6069-4073; Falcke, Heino/0000-0002-2526-6724; Ebr, Jan/0000-0001-8807-6162; Sarkar, Subir/0000-0002-3542-858X

We present the results of searches for dipolar-type anisotropies in different energy ranges above 2.5 x 10(17) eV with the surface detector array of the Pierre Auger Observatory, reporting on both the phase and the amplitude measurements of the first harmonic modulation in the right-ascension distribution. Upper limits on the amplitudes are obtained, which provide the most stringent bounds at present, being below 2% at 99% C.L. for EeV energies. We also compare our results to those of previous experiments as well as with some theoretical expectations. (C) 2011 Elsevier B.V. All rights reserved.

Search for first harmonic modulation in the right ascension distribution of cosmic rays detected at the Pierre Auger Observatory

CARUSO, ROSSELLA;INSOLIA, Antonio;PIRRONELLO, Valerio;
2011

Abstract

We present the results of searches for dipolar-type anisotropies in different energy ranges above 2.5 x 10(17) eV with the surface detector array of the Pierre Auger Observatory, reporting on both the phase and the amplitude measurements of the first harmonic modulation in the right-ascension distribution. Upper limits on the amplitudes are obtained, which provide the most stringent bounds at present, being below 2% at 99% C.L. for EeV energies. We also compare our results to those of previous experiments as well as with some theoretical expectations. (C) 2011 Elsevier B.V. All rights reserved. RI Caramete, Laurentiu/C-2328-2011; Dutan, Ioana/C-2337-2011; Aramo, Carla/D-4317-2011; Beatty, James/D-9310-2011; Pesce, Roberto/G-5791-2011; Kemp, Ernesto/H-1502-2011; Chiavassa, Andrea/A-7597-2012; Verzi, Valerio/B-1149-2012; Chinellato, Carola Dobrigkeit /F-2540-2011; Fauth, Anderson/F-9570-2012; Todero Peixoto, Carlos Jose/G-3873-2012; de souza, Vitor/D-1381-2012; Shellard, Ronald/G-4825-2012; Petrolini, Alessandro/H-3782-2011; Albuquerque, Ivone/H-4645-2012; Muller, Marcio Aparecido/H-9112-2012; D'Urso, Domenico/I-5325-2012; Bleve, Carla/J-2521-2012; martello, daniele/J-3131-2012; Valino, Ines/J-8324-2012; Brogueira, Pedro/K-3868-2012; Chinellato, Jose Augusto/I-7972-2012; Falcke, Heino/H-5262-2012; Ebr, Jan/H-8319-2012; Anjos, Joao/C-8335-2013; Sarkar, Subir/G-5978-2011 OI Shellard, Ronald/0000-0002-2983-1815; D'Urso, Domenico/0000-0002-8215-4542; Brogueira, Pedro/0000-0001-6069-4073; Falcke, Heino/0000-0002-2526-6724; Ebr, Jan/0000-0001-8807-6162; Sarkar, Subir/0000-0002-3542-858X
We present the results of searches for dipolar-type anisotropies in different energy ranges above 2.5 x 10(17) eV with the surface detector array of the Pierre Auger Observatory, reporting on both the phase and the amplitude measurements of the first harmonic modulation in the right-ascension distribution. Upper limits on the amplitudes are obtained, which provide the most stringent bounds at present, being below 2% at 99% C.L. for EeV energies. We also compare our results to those of previous experiments as well as with some theoretical expectations. (C) 2011 Elsevier B.V. All rights reserved.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.11769/13848
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