A multi-messenger study of the Fermi Bubbles: very high energy gamma rays and neutrinos

TL;DR

This study evaluates the potential for multi-messenger observations of the Fermi Bubbles, combining gamma-ray data from HAWC and neutrino data from IceCube to test hadronic origin models within a short observation period.

Contribution

It assesses the detectability of the Fermi Bubbles in very high energy gamma rays with HAWC and their correlation with neutrino signals at IceCube, providing a framework to confirm or constrain hadronic models.

Findings

High significance detection of Fermi Bubbles at HAWC possible within 30 days.

Combined HAWC and IceCube data can confirm or limit hadronic origin models.

Hadrons with a hard spectrum could produce observable signals in both detectors.

Abstract

The Fermi Bubbles have been imaged in sub-TeV gamma rays at Fermi-LAT, and, if their origin is hadronic, they might have been seen with low statistics in $\sim 0.1- 1$ PeV neutrinos at IceCube. We discuss the detectability of these objects at the new High Altitude Water Cherenkov (HAWC) gamma ray detector. HAWC will view the North Bubble for $\sim 2-3$ hours a day, and will map its spectrum at 0.1-100 TeV. For the hard primary proton spectrum required to explain five events at IceCube, a high significance detection at HAWC will be achieved in less than 30 days. The combination of results at HAWC and IceCube will substantiate the hadronic model, or constrain its spectral parameters.