Recent advances on multimessenger astrophysics: Centaurus A, GW 170817, and KM3-230213A

TL;DR

Recent advances in multimessenger astrophysics highlight key events like Centaurus A, GW 170817, and KM3-230213A, revealing new insights into cosmic phenomena and challenging existing models.

Contribution

The paper reviews recent multimessenger astrophysics developments, emphasizing the significance of specific events and their implications for understanding the extreme universe.

Findings

Centaurus A as a prototype multimessenger source

GW 170817 confirmed neutron star mergers as gravitational wave sources

KM3-230213A neutrino challenges current astrophysical models

Abstract

We review recent advances in multimessenger astrophysics, with particular emphasis on Centaurus A and on two pivotal events: the gravitational-wave detection GW 170817 and the ultra-high-energy neutrino KM3-230213A. Centaurus A is the prototype multimessenger source. The GW 170817 event, arising from a binary neutron star merger, marked a transformative moment in astronomy through the joint observation of gravitational waves and a broad spectrum of electromagnetic signals. The KM3-230213A neutrino, detected by the KM3NeT Collaboration, is the most energetic neutrino observed to date and poses significant challenges for current models, given its tension with null results from IceCube and the Pierre Auger Observatory. We assess astrophysical interpretations, including galactic, cosmogenic, and transient extragalactic sources, as well as implications for cosmic-ray acceleration. These cases underscore the scientific potential of high-energy multimessenger events in probing both the extreme universe and new physics.