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The Pierre Auger Observatory for the UHECR
Federico Sanchez, Dip.Fisica e INFN sezione Milano
● What a cosmic ray (CR) and a ultra high energy cosmic ray (UHECR) are?
● What do we know and what we would like to know about them?
● How do we detect them?
● First Auger public results and conclusions
A cosmic ray is not a ray...
What: subatomic
primaries
(e, p, He, C, N, O , Fe) and
secondaries
particles (Li, Be, B) from our galaxy. How and where: Produced by diffusive shock acceleration in SNR (super novae remnants)
Direct observation regime EAS regime
? ? ?
B source
n CR n Relic
B intergalactic
g
B galactic
Nucleons g Nucleons
How far?
X particle B halo
Gaucho
SD FD HYB
Spectrum
Conclusions: ● The Pierre Auger Observatory started regular data taking in January 2004 and released its firsts physics results in August 2005.
● The southern site construction will finish by the end of 2006.
● The northern site is in R&D phase.
Thank you,