Akademska digitalna zbirka SLovenije - logo
E-resources
Full text
Open access
  • Searches for Large-Scale Anisotropy in the Arrival Directions of Cosmic Rays Detected above Energy of \(10^{19}\) eV at the Pierre Auger Observatory and the Telescope Array
    Ahn, E J; Allekotte, I; Aublin, J; Berat, C; Bonifazi, C; Cazon, L; Colalillo, R; Coluccia, M R; Diogo, F; Dorofeev, A; Engel, R; Espadanal, J; San Luis, P Facal; Fang, K; Farrar, G; Filevich, A; Garilli, G; Giaccari, U; M Gómez Berisso; Griffith, N; Grillo, A F; Hansen, P; Harton, J L; Heck, D; Heimann, P; Hojvat, C; Horvath, P; Insolia, A; Isar, P G; Kleinfeller, J; Kuempel, D; La Rosa, G; S Le Coz; Lhenry-Yvon, I; Lucero, A; Ludwig, M; Marin, V; Mariş, I C; Matthews, J A J; Mayotte, E; Menshikov, A; Meyhandan, R; Müller, G; Niemietz, L; Niggemann, T; Paul, T; Pekala, J; Pepe, I M; Pesce, R; Phuntsok, J; Platino, M; Prado, R R; Quel, E J; Querchfeld, S; Revenu, B; Saffi, S J; Salazar, H; Sarmento, R; Sato, R; Schieler, H; Scholten, O; Sigl, G; Šmída, R; Stephan, M; Theodoro, V M; Timmermans, C; Todero Peixoto, C J; Ulrich, R; Valdés Galicia, J F; Valore, L; A van Vliet; Varner, G; Vázquez, J R; Verzi, V; Abu-Zayyad, T; Blake, S A; Goto, T; Hanlon, W; Hayashida, N; Inoue, N; Ishii, T; Ivanov, D; Jui, C C H; Kasahara, K; Kawata, K; Lan, J; Matsuda, T; Matsuyama, T; Minamino, M; Mukai, K; Ogura, J; Okuda, T; Oshima, A; Takamura, M; Takeda, M; Tokuno, H; Troitsky, S; Tsunesada, Y; Uchihori, Y; Vasiloff, G

    arXiv.org, 09/2014
    Paper

    Spherical harmonic moments are well-suited for capturing anisotropy at any scale in the flux of cosmic rays. An unambiguous measurement of the full set of spherical harmonic coefficients requires full-sky coverage. This can be achieved by combining data from observatories located in both the northern and southern hemispheres. To this end, a joint analysis using data recorded at the Telescope Array and the Pierre Auger Observatory above \(10^{19}\) eV is presented in this work. The resulting multipolar expansion of the flux of cosmic rays allows us to perform a series of anisotropy searches, and in particular to report on the angular power spectrum of cosmic rays above \(10^{19}\) eV. No significant deviation from isotropic expectations is found throughout the analyses performed. Upper limits on the amplitudes of the dipole and quadrupole moments are derived as a function of the direction in the sky, varying between 7% and 13% for the dipole and between 7% and 10% for a symmetric quadrupole.

Shelf entry