High-Energy Extragalactic Neutrino Astrophysics

TL;DR

This paper reviews the detection and analysis of high-energy extragalactic neutrinos, highlighting recent discoveries, their astrophysical implications, and future prospects in neutrino astronomy.

Contribution

It provides a comprehensive overview of current extragalactic neutrino sources, recent observational evidence, and discusses future directions in high-energy neutrino astrophysics.

Findings

Detection of astrophysical neutrinos by IceCube in TeV-PeV range

Identification of extragalactic sources like TXS 0506+056 and NGC 1068

Implications for multimessenger astrophysics and cosmic source studies

Abstract

The detection of an astrophysical flux of neutrinos in the TeV-PeV energy range by the IceCube observatory has opened new possibilities for the study of extreme cosmic accelerators. The apparent isotropy of the neutrino arrival directions favors an extragalactic origin for this flux, potentially created by a large population of distant sources. Recent evidence for the detection of neutrino emission from extragalactic sources include the active galaxies TXS 0506+056 and NGC 1068. We here review the current status of the search for the sources of the high-energy neutrino flux, concentrating on its extragalactic contribution. We discuss the implications of these observations for multimessenger studies of cosmic sources and present an outlook for how additional observations by current and future instruments will help address fundamental questions in the emerging field of high-energy neutrino astronomy.