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High-energy Neutrino Constraints on Cosmic-ray Re-acceleration in Radio Halos of Massive Galaxy Clusters by Nishiwaki, Kosuke; Asano, Katsuaki; Murase, Kohta is a scholarly article available to read on EtoBox.

What is High-energy Neutrino Constraints on Cosmic-ray Re-acceleration in Radio Halos of Massive Galaxy Clusters about?

A fraction of merging galaxy clusters host diffuse radio emission in their central region, termed as a giant radio halo (GRH). The most promising mechanism of GRHs is the re-acceleration of non-thermal electrons and positrons by merger-induced turbulence. However, the origin of these seed leptons has been under debate, and either protons or electrons can be primarily-accelerated particles. In this work, we demonstrate that neutrinos can be used as a probe of physical processes in galaxy clusters, and discuss possible constraints on the amount of relativistic protons in the intra-cluster medium with the existing upper limits by IceCube. We calculate radio and neutrino emission from massive ($>10^{14}M_\odot$) galaxy clusters, using the cluster population model of Nishiwaki & Asano (2022). This model is compatible with the observed statistics of GRHs, and we find that the contribution of GRHs to the isotropic radio background observed with the ARCADE-2 experiment should be subdominant. Our fiducial model predicts the all-sky neutrino flux that is consistent with IceCube's upper limit from the stacking analysis. We also show that the neutrino upper limit gives meaningful constraints o

Author

Nishiwaki, Kosuke; Asano, Katsuaki; Murase, Kohta

Published

2023

Language

EN