Search for Very High Energy Gamma Rays from the Northern $\text{Fermi}$ Bubble Region with HAWC

Abstract

We present a search of very high energy gamma-ray emission from the Northern $\text{Fermi}$ Bubble region using data collected with the High Altitude Water Cherenkov (HAWC) gamma-ray observatory. The size of the data set is 290 days. No significant excess is observed in the Northern $\text{Fermi}$ Bubble region, hence upper limits above $1\text{TeV}$ are calculated. The upper limits are between $3\times 10^{-7}\text{GeV}{\text{cm}}^{-2}{\text{s}}^{-1}{\text{sr}}^{-1}$ and $4\times 10^{-8}\text{GeV}{\text{cm}}^{-2}{\text{s}}^{-1}{\text{sr}}^{-1}$. The upper limits disfavor a proton injection spectrum that extends beyond $100\text{TeV}$ without being suppressed. They also disfavor a hadronic injection spectrum derived from neutrino measurements.

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