We present the results of searches for dipolar-type anisotropies in different energy ranges above 2.5 × 10 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% for EeV energies. We also compare our results to those of previous experiments as well as with some theoretical expectations
Search for First Harmonic Modulation in the Right Ascension Distribution of Cosmic Rays Detected at the Pierre Auger Observatory / Guarino, Fausto; D'Urso, Domenico; Valore, Laura; M., Ambrosio; Aramo, Carla; The Pierre Auger, C. o. l. l. a. b. o. r. a. t. i. o. n. .. - In: ASTROPARTICLE PHYSICS. - ISSN 0927-6505. - 34:(2011), pp. 627-639. [10.1016/j.astropartphys.2010.12.007]
Search for First Harmonic Modulation in the Right Ascension Distribution of Cosmic Rays Detected at the Pierre Auger Observatory
GUARINO, FAUSTO;D'URSO, DOMENICO;VALORE, LAURA;ARAMO, CARLA;
2011
Abstract
We present the results of searches for dipolar-type anisotropies in different energy ranges above 2.5 × 10 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% for EeV energies. We also compare our results to those of previous experiments as well as with some theoretical expectationsI documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
