Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-08-06
Int.J.Mod.Phys.E16:1093-1105,2007
Astronomy and Astrophysics
Astrophysics
Invited paper presented at the International Symposium on Heavy Ion Physics 2006 (ISHIP 2006), Heavy Ion Physics - Gateway to
Scientific paper
10.1142/S021830130700654X
The southern Pierre Auger Observatory, presently under construction in Malarg"ue, Argentina, is nearing completion. The instrument is designed to measure extensive air-showers with energies ranging from $10^{18}$-$10^{20}$ eV and beyond. It combines two complementary observation techniques; the detection of particles at ground and the coincident observation of associated fluorescence light generated in the atmosphere above the ground. This is being realized by employing an array of 1600 water Cherenkov detectors, distributed over an area of 3000 km$^{2}$, and operating 24 wide-angle Schmidt telescopes, positioned at four sites at the border of the ground array. The Observatory will reach its full size only in 2007 but data are routinely recorded already and have started to provide relevant science results. This talk will focus on the detector characterizations and presents first results on the arrival direction of extremely-high energy cosmic rays, their energy spectrum, and on the upper limit of the photon fraction.
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