Searches for Neutrinos from LHAASO ultra-high-energy γ-ray sources using the IceCube Neutrino Observatory

Abstract

Galactic PeVatrons are Galactic sources theorized to accelerate cosmic rays up to PeV in energy. The accelerated cosmic rays are expected to interact hadronically with nearby ambient gas or the interstellar medium, resulting in γ-rays and neutrinos. Recently, the Large High Altitude Air Shower Observatory (LHAASO) identified 12 γ-ray sources with emissions above 100 TeV, making them candidates for PeV cosmic-ray accelerators (PeVatrons). While at these high energies the Klein-Nishina effect suppresses exponentially leptonic emission from Galactic sources, evidence for neutrino emission would unequivocally confirm hadronic acceleration. Here, we present the results of a search for neutrinos from these γ-ray sources and stacking searches testing for excess neutrino emission from all 12 sources as well as their subcatalogs of supernova remnants and pulsar wind nebulae with 11 years of track events from the IceCube Neutrino Observatory. No significant emissions were found. Based on the resulting limits, we place constraints on the fraction of γ-ray flux originating from the hadronic processes in the Crab Nebula and LHAASOJ2226+6057.

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Cited by in corpus (8)

• The LHAASO PeVatron bright sky: what we learned
• Search for Extended Sources of Neutrino Emission in the Galactic Plane with IceCube
• Beyond first light: Global monitoring for high-energy neutrino astronomy
• Search for joint multimessenger signals from potential galactic cosmic-ray accelerators with HAWC and IceCube
• First Search for High-Energy Neutrino Emission from Galaxy Mergers
• Constraints on the origins of the Galactic neutrino flux
• The traveling-PWN modeling attempt on the enigmatic LHAASO dumbbell-like structure
• Particle Astrophysics with High and Ultrahigh Energy Neutrinos