INVESTIGADORES
MARIAZZI Analisa Gabriela
artículos
Título:
Searches for Large-Scale Anisotropy in the Arrival Directions of Cosmic Rays above 10^19 eV at the Pierre Auger Observatory and the Telescope Array
Autor/es:
PIERRE AUGER COLLABORATION (A. AAB, ... , A. MARIAZZI, ET AL)
Revista:
ASTROPHYSICAL JOURNAL
Editorial:
IOP PUBLISHING LTD
Referencias:
Lugar: Londres; Año: 2014 vol. 794 p. 172 - 187
ISSN:
0004-637X
Resumen:
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 1019 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 1019 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.