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

TL;DR

This paper estimates the neutrino flux from Cyg X-3 during specific X-ray states, compares it with IceCube observations, and discusses how these data constrain hadronic emission models for this microquasar.

Contribution

It provides the first detailed neutrino flux estimates for Cyg X-3 during different X-ray states and assesses the constraints on hadronic models using IceCube data.

Findings

Expected neutrino events are below 1 over 5 years with IceCube.

IceCube data begins to constrain hadronic emission models.

Neutrino flux estimates depend on the X-ray state of Cyg X-3.

Abstract

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