Search for Galactic PeV gamma rays with the IceCube Neutrino Observatory
Date
2013
Authors
Aartsen, M.
Hill, G.
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Journal article
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Physical Review D: Particles, Fields, Gravitation and Cosmology, 2013; 87(6):1-15
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M. G. Aartsen...G. C. Hill...et al. (IceCube Collaboration)
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Abstract
Gamma-ray induced air showers are notable for their lack of muons, compared to hadronic showers. Hence, air shower arrays with large underground muon detectors can select a sample greatly enriched in photon showers by rejecting showers containing muons. IceCube is sensitive to muons with energies above ∼500 GeV at the surface, which provides an efficient veto system for hadronic air showers with energies above 1 PeV. One year of data from the 40-string IceCube configuration was used to perform a search for point sources and a Galactic diffuse signal. No sources were found, resulting in a 90% C.L. upper limit on the ratio of gamma rays to cosmic rays of 1.2×10-3 for the flux coming from the Galactic plane region (-80°≲l≲-30°; -10°≲b≲5°) in the energy range 1.2–6.0 PeV. In the same energy range, point source fluxes with E-2 spectra have been excluded at a level of (E/TeV)2dΦ/dE∼10-12–10-11 cm-2 s-1 TeV-1 depending on source declination. The complete IceCube detector will have a better sensitivity (due to the larger detector size), improved reconstruction, and vetoing techniques. Preliminary data from the nearly final IceCube detector configuration have been used to estimate the 5-yr sensitivity of the full detector. It is found to be more than an order of magnitude better, allowing the search for PeV extensions of known TeV gamma-ray emitters.
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© 2013 American Physical Society