Neutrinos and {\gamma}-rays from the Galactic Center Region After H.E.S.S. Multi-TeV Measurements

TL;DR

This paper investigates the potential for detecting high-energy neutrinos from the Galactic Center, considering gamma-ray absorption effects and providing flux limits, highlighting the capabilities of upcoming km3-class neutrino telescopes.

Contribution

It offers the first detailed analysis of neutrino flux limits from the Galactic Center based on H.E.S.S. gamma-ray data, accounting for gamma-ray absorption uncertainties.

Findings

Gamma-ray absorption effects are small at current energies but could be large near the Center.

Upper limits on neutrino fluxes are established based on H.E.S.S. measurements.

Future km3-class detectors in the Northern Hemisphere can potentially detect neutrinos from the Galactic Center.

Abstract

The hypothesis of a PeVatron in the Galactic Center, emerged with the recent {\gamma}-ray measurements of H.E.S.S., motivates the search for neutrinos from this source. The effect of {\gamma}-ray absorption is studied: at the energies currently probed, the known background radiation fields lead to small effects, whereas it is not possible to exclude large effects due to new IR radiation fields near the very Center. Precise upper limits on neutrino fluxes are derived and the underlying hypotheses are discussed. The expected number of events for ANTARES, IceCube and KM3NeT, based on the H.E.S.S. measurements, are calculated. It is shown that km3-class telescopes in the Northern hemisphere have the potential of observing high-energy neutrinos from this important astronomical object and can check the existence of a hadronic PeV galactic accelerator.