INSTITUTO DE FISICA LA PLATA
Unidad Ejecutora - UE
congresos y reuniones científicas
Search for sidereal modulation of the arrival directions of events recorded at the Pierre Auger Observatory
THE PIERRE AUGER COLLABORATION (AUTOR 434 DE 474); M. TUEROS
Conferencia; 31st International Cosmic Ray Conference; 2009
Using data collected by the Pierre Auger Observatory from 1 January 2004 until 31 March 2009, we search for large scale anisotropies in dif-ferent energy windows above 2 · 1017 eV. A Fourier analysis shows the presence of a ∼ 3% modulation at the solar frequency, arising from modulations of the array exposure and weather effects on the showers.We study the sidereal anisotropies using a Rayleigh method which accounts for these effects, and the East-West differential method which is largely independent of them. No significant anisotropies are observed, resulting in bounds on the first harmonic amplitude at the 1% level at EeV energies.