IceCube Constraints on the Fermi Bubbles

Nimrod Sherf, Uri Keshet, Ilya Gurwich

Research output: Contribution to journalArticlepeer-review


We analyze the IceCube four-year neutrino data in search of a signal from the Fermi bubbles. No signal is found from the bubbles or from their dense shell, even when taking into account the softer background. This imposes a conservative ξi < 8% upper limit on the cosmic-ray ion (CRI) acceleration efficiency, and an η ≡ ξei 0.006 lower limit on the electron-to-ion ratio of acceleration efficiencies (at the 2σ confidence level). For typical ξi, a signal should surface once the number of IceCube neutrinos increases by ∼an order of magnitude, unless there is a <PeV cutoff on the CRI spectrum.

Original languageEnglish
Article number95
JournalAstrophysical Journal
Issue number2
StatePublished - 1 Oct 2017


  • Galaxy: center
  • acceleration of particles
  • cosmic rays
  • gamma rays: ISM
  • neutrinos

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science


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