Galactic Center origin of a subset of IceCube neutrino events

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88 Citations (Scopus)

Abstract

The center of the Milky Way is a host to energetic phenomena across many electromagnetic wave bands and now possibly of high-energy neutrinos. We show that 5 out of 21 IceCube showerlike events, including a PeV event, likely originated from the Galactic Center region. A hard spectrum and flux inferred from these events are inconsistent with atmospheric neutrinos. The flux of these neutrinos is consistent with an extrapolation of the gamma-ray flux measured by Fermi-LAT from the inner Galactic region. This indicates a common hadronic origin of both, powered by supernovae. Three other showerlike events are spatially correlated with the Fermi bubbles, originating from the Galactic Center activity, within the uncertainty of reconstructing their arrival directions. The origin of the other neutrino events, including 7 tracklike events, is still elusive.

Original languageEnglish
Article number081302
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume88
Issue number8
DOIs
Publication statusPublished - 18 Oct 2013

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Physics and Astronomy (miscellaneous)

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