Transcript Pierre Auger Observatory Some science topics Spectrum Inclined Events Fluorescence Yield Neutrino Limits Clusters/Anisotropy (Diego Harari) Photon Limit (Markus Risse) James W.

Pierre Auger Observatory
Some science topics
Spectrum
Inclined Events
Fluorescence Yield
Neutrino Limits
Clusters/Anisotropy (Diego Harari)
Photon Limit (Markus Risse)
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James W. Cronin
Rencontres du Vietnam
Hanoi
August 7, 2006

S1000 is
Energy parameter
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SD energy ~ 1019.8
Key feature of the Auger Observatory
Hybrid measurements:
Calibration of energy and shower geometry
by fluorescence telescope
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Measured , not simulated
Measured
Not simulated
By Tokonatsu Yamamoto
University of Chicago
Normalized to 1.0 at
sec theta = 1.27 or
theta = 38 deg
Attenuation curve by constant intensity technique
Measured from data
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not simulated
ICRC 2005
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Comparison with HiRes1,
AGASA
32,000 Inclined showers ≥ 600
Energy reconstruction
Log(E/EeV) = 0.73 ± 0.03 + (1.04 ± 0.06) log(N19)
Hybrid data: FD versus SD reconstruction
Inclined showers > 60 deg
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Signal processing can extract em/muon ratio
Old Shower: pure muons
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Preliminary !
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Theoretical uncertainty
± factor 3
Elongation Rate
17.5
18.75
18.0
18.5
19.25
19.75
Nicholas Busca