Multi-messenger signatures of astrophysical neutrino sources

by Dmitri Semikoz (APC in Paris)

Thursday 15 Feb 2024, 15:00 → 16:00 Europe/Berlin

A.1.01/03 - Alps (New)

In this talk I’ll review recent observations of galactic and extragalactic neutrino

sources comparing them to the predictions of theoretical models.  

At multi-TeV energies dominant contribution to the neutrino flux of Milky Way is expected from Galactic Ridge,
 

brightest region of our  Galaxy, where cosmic rays interact with interstellar gas and produce 

secondary gamma-rays and neutrinos.  In neutrinos first hint of Galactic Ridge  was found in ANTARES in 2022.  

In 2023  IceCube detected it in cascade channel with 4 sigma significance.  I’ll discuss perspectives 

of detection of Galactic Ridge by  future neutrino telescopes and by LHAASO, SWGO and CTA in gamma-rays. 

Also I’ll review recent gamma-ray and neutrino observations from Pevatron source 

in Cygnus region.

For extragalactic neutrino sources I’ll focus on Seyfert galaxies. In addition 
 

to well known NGC 1068   only two other sources, based on their  hard X-ray properties,

 NGC 4151 and NGC 3079 are expected to be detectable in 10 years of IceCube data.  

We find an evidence for neutrino signal from both sources in publicly available ten-year IceCube dataset. 

The chance coincidence probability to find the observed neutrino count excesses in the directions

 of the two out of two expected sources, in addition to the previously reported brightest source, is p<2.6e-7. 

This corresponds to the detection of Seyfert galaxies as a neutrino source class.