INVESTIGADORES
TUEROS Matias Jorge
congresos y reuniones científicas
Título:
Anisotropies and chemical composition of ultra-high energy cosmic rays using arrival directions measured with the Pierre Auger Observatory
Autor/es:
THE PIERRE AUGER COLLABORATION (AUTOR 434 DE 474); M. TUEROS (COAUTOR)
Lugar:
Beijing
Reunión:
Conferencia; 32nd International Cosmic Ray Conference 2011; 2011
Institución organizadora:
Institute of High Energy Physics, Chinese Academy of Sciences
Resumen:
The Pierre Auger Collaboration has reported evidence for anisotropies in the arrival directions of cosmic rays with energies larger than Eth = 55 EeV. There is a correlation above the isotropic expectation with nearby active galaxies and the largest excess is in a celestial region around the position of the radio galaxy Cen A. If these anisotropies are due to nuclei of charge Z, the protons accelerated in those sources are expected, under reasonable assumptions, to lead to excesses in the same regions of the sky at energies above Eth/Z. We here report the lack of anisotropies at these lower energies for illustrative values of Z = 6, 13 and 26. These observations set stringent constraints on the allowed proton fraction at the sources.
