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Article Dans Une Revue The Astrophysical Journal Année : 2014

A search for point sources of EeV photons

A. Aab
  • Fonction : Auteur
Pascal Lautridou
Benoît Revenu
A. Stutz
  • Fonction : Auteur
  • PersonId : 1274065
Imen Al Samarai

Résumé

Measurements of air showers made using the hybrid technique developed with the fluorescence and surface detectors of the Pierre Auger Observatory allow a sensitive search for point sources of EeV photons anywhere in the exposed sky. A multivariate analysis reduces the background of hadronic cosmic rays. The search is sensitive to a declination band from -85{\deg} to +20{\deg}, in an energy range from 10^17.3 eV to 10^18.5 eV. No photon point source has been detected. An upper limit on the photon flux has been derived for every direction. The mean value of the energy flux limit that results from this, assuming a photon spectral index of -2, is 0.06 eV cm^-2 s^-1, and no celestial direction exceeds 0.25 eV cm^-2 s^-1. These upper limits constrain scenarios in which EeV cosmic ray protons are emitted by non-transient sources in the Galaxy.

Dates et versions

in2p3-01006574 , version 1 (16-06-2014)

Identifiants

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A. Aab, J. Aublin, P. Billoir, M. Blanco, L. Caccianiga, et al.. A search for point sources of EeV photons. The Astrophysical Journal, 2014, 789, pp.160. ⟨10.1088/0004-637X/789/2/160⟩. ⟨in2p3-01006574⟩
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