Search for neutrino emission from LHAASO observed Microquasar with IceCube 10-year data

TL;DR

This study searches for neutrino emission from microquasars detected by LHAASO using ten years of IceCube data, finding no significant signals but constraining their contribution to Galactic neutrino flux.

Contribution

First comprehensive search for neutrinos from LHAASO-identified microquasars with a decade of IceCube data, providing constraints on their role as PeV cosmic-ray sources.

Findings

No significant neutrino detection from the sources.

Microquasars contribute only a small fraction to Galactic diffuse neutrino flux.

Future neutrino telescopes will have improved sensitivity to these sources.

Abstract

The Large High Altitude Air Shower Observatory (LHAASO) has detected ultra-high-energy (UHE; E>100 TeV) gamma-ray emission from five microquasars, suggesting their potential as Galactic PeV cosmic-ray accelerators. At these energies, the Klein-Nishima effect strongly suppresses leptonic processes, making neutrinos observation a crucial test for hadronic acceleration. We present a search for neutrino emission from these LHAASO-identified Microquasars using ten years of IceCube muon-track data. No significant neutrino signal was found in either single-source or stacking analyses. Our stacking result further shows that the studied microquasars population can only account for a small fraction of the diffuse neutrino flux along the Galactic Plane. Finally, we demonstrate that new-generation neutrino telescopes, such as HUN, will have the sensitivity to probe harmonic emission from these candidate PeVatrons.