Neutrinos from the Fermi Bubbles with ANTARES

Abstract

The Fermi Bubbles are giant lobe-shaped structures of $\gamma$-ray emission extending above and below the Galactic Center. A variety of both hadronic and leptonic models has been proposed to explain the emission, yet its origin remains unclear. Only in hadronic scenarios, the $\gamma$-ray flux is accompanied by an associated neutrino flux that might be detected with large volume neutrino detectors. ANTARES is the largest neutrino telescope in the Northern Hemisphere and has been operated in its final configuration since 2008. Its location in the Mediterranean sea provides an excellent view towards the Fermi Bubbles' region. In a previous analysis ANTARES has observed a non-significant excess of neutrinos in the Fermi Bubble region using charged current interactions of $\nu_\mu$. For these events, the outgoing muon produces an elongated track-like signature that can be reconstructed with sub-degree angular resolution. More recently, improved shower reconstruction algorithms achieve a precision of $\sim3^{\circ}$ also for signatures produced in $\nu_e$, $\nu_\tau$ and neutral current interactions. This contribution presents the search for shower-like events from the Fermi Bubbles in ANTARES data. In combination with the previous analysis, upper limits on the all-flavour neutrino emission from the region are derived.