BEXCO - Room E(106/107)
[GA203] Searching for VHE gamma-ray emission associated with IceCube astrophysical neutrinos using FACT, H.E.S.S., MAGIC and VERITAS
- Marcos SANTANDER
The detection of an astrophysical flux of high-energy neutrinos by IceCube is a major step forward in the search for the origin of cosmic rays, as this emission is expected to originate in hadronic interactions taking place in or near cosmic-ray accelerators. No neutrino point sources, or a significant correlation with known astrophysical objects, have been identified in the IceCube data so far that could reveal the location of the neutrino emission sites. The hadronic interactions responsible for the neutrino emission should also lead to the production of high-energy gamma rays from neutral pion decays. The search for neutrino sources can then be performed by studying the spatial and temporal correlations between neutrino events and very high energy (VHE, E > 100 GeV) gamma rays. We report on the search for VHE gamma-ray emission at the reconstructed position of muon neutrino events detected by IceCube using the FACT, H.E.S.S., MAGIC, and VERITAS imaging air Cherenkov telescopes (IACTs). No significant steady gamma-ray counterparts have been identified for the neutrino events observed so far. Based on these results, we derive constraints on the gamma-ray luminosity and density of the sources responsible for the IceCube flux. We also outline recent programs to perform prompt IACT observations of realtime IceCube neutrino event positions.