Astronomy and Astrophysics – Astrophysics – General Relativity and Quantum Cosmology
Scientific paper
1995-11-10
Astropart.Phys.5:279-283,1996
Astronomy and Astrophysics
Astrophysics
General Relativity and Quantum Cosmology
Some remarks by the referee added, to appear in Astroparticle Physics
Scientific paper
10.1016/0927-6505(96)00029-1
The ultra--high energy cosmic rays recently detected by several air shower experiments could have an extragalactic origin. In this case, the nearest active galaxy Centaurus A might be the source of the most energetic particles ever detected on Earth. We have used recent radio observations in order to estimate the arrival energy of the protons accelerated by strong shock fronts in the outer parts of this southern radio source. We expect detections corresponding to particles with energies up to $\sim 2.2 \times 10^{21}$ eV and an arrival direction of ($l \approx 310^{\circ}$, $b \approx 20^{\circ}$) in galactic coordinates. The future Southern Hemisphere Pierre Auger Observatory might provide a decisive test for extragalactic models of the origin of the ultra--high energy cosmic rays.
Anchordoqui Luis A.
Combi Jorge Ariel
Perez Bergliaffa Santiago E.
Romero Gustavo E.
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