Upper limit on the primary photon fraction from the Pierre Auger Observatory - INSPIRE

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Upper limit on the primary photon fraction from the Pierre Auger Observatory

Pierre Auger

Collaboration

•

Markus Risse
(
- Karlsruhe, Forschungszentrum
)

for the collaboration.

Jul, 2005

4 pages

Contribution to:

- ICRC 2005

e-Print:

astro-ph/0507402 [astro-ph]

Report number:

FERMILAB-CONF-05-274-E-TD

Experiments:

AUGER

View in:

reference search13 citations

Citations per year

Abstract: (arXiv)

Based on observations of the depth of shower maximum performed with the hybrid detector of the Auger Observatory, an upper limit on the cosmic-ray photon fraction of 26% (at 95% confidence level) is derived for primary energies above 10^19 eV. Additional observables recorded with the surface detector array, available for a sub-set of the data sample, support the conclusion that a photon origin of the observed events is not favoured.

Note:

4 pages, 4 figures. To be presented at the 29th ICRC, Pune, August 2005. The Pierre Auger author list is given at http://www.auger.org/admin

References(13)

Figures(4)

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