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In this work we give an estimate of the neutrino flux that can be expectedfrom the microquasar Cyg X-3. We calculate the muon neutrino flux expected hereon Earth as well as the corresponding number of neutrino events in the IceCubetelescope based on the so-called hypersoft X-ray state of Cyg~X-3. If theaverage emission from Cyg~X-3 over a period of 5 yr were as high as during theused X-ray state, a total of 0.8 events should be observed by the full IceCubetelescope. We also show that this conclusion holds by a factor of a few when weconsider the other measured X-ray states. Using the correlation of AGILE dataon the flaring episodes in 2009 June and July to the hypersoft X-ray state wecalculate that the upper limits on the neutrino flux given by IceCube arestarting to constrain the hadronic models, which have been introduced tointerpret the high-energy emission detected by AGILE.

Estimation of the neutrino flux and resulting constraints on hadronic emission models for Cyg X-3 using AGILE data