Fermi bubbles detected in ∼100 TeV neutrinos
Abstract
The Fermi bubbles have been identified as a collimated bipolar outflow emanating from the Milky-Way center, tracing strong forward shocks which extend ∼10 kpc from the Galactic disk, originating from a ∼1056±1 erg outburst. These shocks are sufficiently strong, extended, and energetic to produce a detectable flux of ≳ 10 TeV neutrinos, especially in their denser north and east, but early IceCube data were insufficient for identifying the signal. We find that IceCube high-energy starting events (HESE 12-year) correlate with the Fermi-LAT sky map outside the Galactic plane (>3σ). Testing for neutrinos coincident with the bubble shells, localized using eROSITA data, we detect (>4σ) both bubbles at high (|b|>30∘) latitudes, with a local excess mainly in their X-ray bright eastern shells (>5σ). The signal matches the anticipated secondaries of relativistic ions carrying ∼ 1054.5 erg (with factor ∼3 uncertainty) in each bubble, shock-accelerated to >PeV energies. The results verify the strength of the shocks, suggesting an ion acceleration efficiency of order ∼10%. We also present preliminary evidence for neutrinos from the even larger shells of the eROSITA bubbles, which encapsulate their younger Fermi-bubble counterparts, carrying a similar energy and confined by shocks nearly as strong.
Related
- The Origin of the Fermi Halo-like Emission: A New Model of the Fermi Bubbles
- Search for high-energy neutrinos from Einstein Probe detected Fast X-ray Transients using 14 years of IceCube muon track data
- Simulating the Formation of the Young “Fermi Bubbles” in the Circinus Galaxy
- Correlation of galactic very-high-energy gamma-ray sources detected by LHAASO with high-energy neutrinos
- How particle physics stops ultra-relativistic bubbles and shapes their gravitational waves
BibTeX
@misc{keshet2026fermi,
title = {{Fermi bubbles detected in $\sim$100 TeV neutrinos}},
author = {Uri Keshet and Ilya Gurwich},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2606.22387},
eprint = {2606.22387},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2606.22387},
}
RIS
TY - UNPB
TI - Fermi bubbles detected in ∼100 TeV neutrinos
AU - Uri Keshet
AU - Ilya Gurwich
PY - 2026
DA - 2026/09/27
PB - arXiv
DO - 10.48550/arxiv.2606.22387
UR - https://arxiv.org/abs/2606.22387
AB - The Fermi bubbles have been identified as a collimated bipolar outflow emanating from the Milky-Way center, tracing strong forward shocks which extend ∼10 kpc from the Galactic disk, originating from a ∼10^56±1 erg outburst. These shocks are sufficiently strong, extended, and energetic to produce a detectable flux of ≳ 10 TeV neutrinos, especially in their denser north and east, but early IceCube data were insufficient for identifying the signal. We find that IceCube high-energy starting events (HESE 12-year) correlate with the Fermi-LAT sky map outside the Galactic plane (>3σ). Testing for neutrinos coincident with the bubble shells, localized using eROSITA data, we detect (>4σ) both bubbles at high (|b|>30^∘) latitudes, with a local excess mainly in their X-ray bright eastern shells (>5σ). The signal matches the anticipated secondaries of relativistic ions carrying ∼ 10^54.5 erg (with factor ∼3 uncertainty) in each bubble, shock-accelerated to >PeV energies. The results verify the strength of the shocks, suggesting an ion acceleration efficiency of order ∼10%. We also present preliminary evidence for neutrinos from the even larger shells of the eROSITA bubbles, which encapsulate their younger Fermi-bubble counterparts, carrying a similar energy and confined by shocks nearly as strong.
ER -