Time-integrated constraint on neutrino flux of CHIME fast radio burst sources with 10-year IceCube point-source data

TL;DR

This study investigates the potential link between CHIME/FRB catalog 1 fast radio bursts and IceCube cosmic neutrinos, setting upper limits on neutrino flux and finding no direct association but leaving open the possibility of FRBs contributing to the diffuse neutrino background.

Contribution

It provides the first constraint on the diffuse muon neutrino flux from CHIME/FRB catalog 1 FRBs using 10-year IceCube data, incorporating completeness correction.

Findings

No significant association between FRBs and neutrinos was found.

The 95% upper limit on the diffuse muon neutrino flux from FRBs is about 70.3% of IceCube's observed flux.

Results are consistent with non-detection, but FRBs could still contribute to the neutrino background.

Abstract

Despite numerous studies, the sources of IceCube cosmic neutrinos are mostly unidentified. Utilizing recently released IceCube neutrino and CHIME fast radio burst (FRB) catalogs, we examine the possibility of an association between neutrinos and CHIME/FRB catalog 1 FRBs for both the entire FRB population and individual FRBs using the unbinned maximum likelihood method. Our results do not directly support the possibility of the above-mentioned association with three weighting schemes: equal, total radio fluence, and event rate. We then attempt to constrain the diffuse muon neutrino flux upper limit from CHIME/FRB catalog 1 FRBs. After considering a completeness correction, we find the 95% diffuse muon neutrino flux upper limit at 100 TeV for all FRB sources in the universe to be $\sim 1.01\times10^{-18}\;\mathrm{GeV}^{-1}\;\mathrm{cm}^{-2}\;\mathrm{s}^{-1}\;\mathrm{sr}^{-1}$, or $\sim 70.3\%$ of the 10-year diffuse neutrino flux observed by IceCube. Our results match the non-detection results of other studies, but we do not rule out FRBs being a significant contributor to the diffuse neutrino flux measured by IceCube.