High-energy neutrinos from radio galaxies

TL;DR

This paper explores the potential of radio galaxies, especially FR-I types, as sources of high-energy cosmic neutrinos observed by IceCube, highlighting their viability over FR-II galaxies due to interaction conditions.

Contribution

It demonstrates that FR-I radio galaxies can plausibly produce the observed high-energy neutrinos through hadronic interactions, offering a new candidate source class.

Findings

FR-I radio galaxies can account for IceCube neutrino observations.

FR-II radio galaxies are less likely sources due to insufficient column depths.

Hadronic interactions in radio galaxies are a viable neutrino production mechanism.

Abstract

The IceCube experiment has recently reported the first observation of high-energy cosmic neutrinos. Their origin is still unknown. In this paper, we investigate the possibility that they originate in active galaxies. We show that hadronic interactions (pp) in the generally less powerful, more frequent, FR-I radio galaxies are one of the candidate source classes being able to accommodate the observation while the more powerful, less frequent, class of FR-II radio galaxies has too low of a column depths to explain the signal.