Ultra High Energy Cosmic Rays: origin and propagation

Abstract

We discuss the basic difficulties in understanding the origin of the highest energy particles in the Universe - the ultrahigh energy cosmic rays (UHECR). It is difficult to imagine the sources they are accelerated in. Because of the strong attenuation of UHECR on their propagation from the sources to us these sources should be at cosmologically short distance from us but are currently not identified. We also give information of the most recent experimental results including the ones reported at this conference and compare them to models of the UHECR origin.

LaTeX, 15 pages, 13 postscript figures, Invited talk at the 30th International Conference of Cosmic Rays, July 2007, Merida, Mexico

References in corpus (6)

• The UHECR spectrum measured at the Pierre Auger Observatory and its astrophysical implications
• Study of the Cosmic Ray Composition above 0.4 EeV using the Longitudinal Profiles of Showers observed at the Pierre Auger Observatory
• Measurement of the UHECR energy spectrum using data from the Surface Detector of the Pierre Auger Observatory
• Test of hadronic interaction models with data from the Pierre Auger Observatory
• Measurement of the UHECR energy spectrum from hybrid data of the Pierre Auger Observatory
• Measurement of the UHECR spectrum above 10 EeV at the Pierre Auger Observatory using showers with zenith angles greater than 60 degrees

Cited by in corpus (6)

• On the Possible Association of Ultra High Energy Cosmic Rays with Nearby Active Galaxies
• Cosmic Ray Composition and Energy Spectrum from 1-30 PeV Using the 40-String Configuration of IceTop and IceCube
• Ultrahigh energy cosmic rays and neutrino flux models
• The CTA Observatory
• HERMES: Simulating the Propagation of Ultra-High Energy Cosmic Rays
• Ultra-high energy cosmic rays with UFA-15 source model in Bumblebee gravity theory