Neutrinos from the Galactic Center in the Light of HESS

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  • 6 December 2004
Abstract
We re-evaluate the event rate expected in km^3-scale detectors for neutrinos from the direction of the Galactic Center (GC) in light of recent results obtained by the HESS instrument for ~TeV gamma-radiation from this direction. Though (in the most plausible scenario) the re-evaluated event rate is smaller than that previously calculated--and here re-calculated--on the basis of EGRET data, the HESS GC gamma-ray detection, together with the strong indications for an overabundance of cosmic rays coming from the GC at EeV energies, strengthen the expectation for a detectable, TeV-PeV GC neutrino signal from proton-proton interactions in that region. If the HESS-EeV cosmic ray anisotropy connection is correct, this signal will be detectable within a year and half for km^3-scale neutrino detectors in the Northern Hemisphere at super-TeV energies and, significantly, should also be detectable in 1.6 years by the South Polar IceCube detector at energies >~ 10^14 eV. The GC neutrino signal should also produce a detectable signal from neutrino showering and resonant W- production by anti-electron-neutrinos in the volume of a km^3-scale detector.

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