Ronald Mark Aguirre Vega - Academia.edu (original) (raw)

Papers by Ronald Mark Aguirre Vega

Physical Review Letters, 2008

[ Research paper thumbnail of Erratum to “Atmospheric effects on extensive air showers observed with the surface detector of the Pierre Auger observatory” [Astroparticle Physics 32(2) (2009), 89–99](https://attachments.academia-assets.com/49051132/thumbnails/1.jpg)

Astroparticle Physics, 2010

$Research paper thumbnail of Upper limit on the cosmic-ray photon fraction at EeV energies from the Pierre Auger Observatory$

Astroparticle Physics, 2009

Astroparticle Physics, 2008

Science, 2007

Using data collected at the Pierre Auger Observatory during the past 3.7 years, we demonstrated a... more Using data collected at the Pierre Auger Observatory during the past 3.7 years, we demonstrated a correlation between the arrival directions of cosmic rays with energy above ~ 6x10^{19} electron volts and the positions of active galactic nuclei (AGN) lying within ~ 75 megaparsecs. We rejected the hypothesis of an isotropic distribution of these cosmic rays with at least a 99% confidence level from a prescribed a priori test. The correlation we observed is compatible with the hypothesis that the highest energy particles originate from nearby extragalactic sources whose flux has not been substantially reduced by interaction with the cosmic background radiation. AGN or objects having a similar spatial distribution are possible sources.

Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment, 2010

Astroparticle Physics, 2010