Galactic Diffuse Neutrino Emission from Sources beyond the Discovery Horizon

Abstract

The IceCube Neutrino Observatory has recently reported strong evidence for neutrino emission from the Galactic plane. The signal is consistent with model predictions of diffuse emission from cosmic ray propagation in the interstellar medium. However, due to IceCube's limited potential of identifying individual neutrino sources, it is also feasible that unresolved Galactic sources could contribute to the signal. We investigate the contribution of this quasi-diffuse emission and show that the observed Galactic diffuse flux at 100 TeV could be dominated by hard emission of unresolved sources. Particularly interesting candidate sources are young massive stellar clusters that have been considered as cosmic-ray PeVatrons. We examine whether this hypothesis can be tested by the upcoming KM3NeT detector or the planned future facility IceCube-Gen2 with about five times the sensitivity of IceCube.

Matches version published in Physical Review D 109, 043007 (2024)

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Cited by in corpus (7)

• Particle acceleration and multi-messenger radiation from Ultra-Luminous X-ray Sources: A new class of Galactic PeVatrons
• A proposed deep sea Neutrino Observatory in the Nanhai
• The Origin of the Very-High-Energy Diffuse $\gamma$-Ray Emission: The Case for Galactic Source Cocoons
• Deciphering the Sources of Cosmic Neutrinos
• Estimatingthe Contribution of Galactic Neutrino Sources
• Multimessenger Emission from Very-High-Energy Black Hole-Jet Systems in the Milky Way
• TeV-PeV Gamma-ray and Neutrino Emission in the Galactic Plane