Eta carinae: A multi-messenger source

Colliding-wind binaries have long been thought to accelerate particles in the shocked wind. Recent detection of a hard γ-ray spectrum by the Fermi-LAT from η Carinae hints to the presence of a hadronic component dominating in the ≈ 10-300 GeV range, presumably from protons accelerated in the shocks and interacting (pp) with particles in the wind. Neutrinos are naturally produced in pp interactions and emitted together with γ rays. Detection of this multi-messenger signal can be very powerful to probe characteristics of the hadronic γ-ray component as well as particle acceleration. We show that detection of high-energy neutrinos from η Carinae by neutrino telescopes can probe the maximum shock-accelerated proton energy in the ≥ 0.1 PeV range.