Speaker
Description
"The discovery of an unexpectedly large flux of extragalactic neutrinos
revealed that cosmic neutrinos are produced in environments from which
accompanying gamma rays from neutral pion decay escape with significant
loss of energy, to appear below the threshold of the NASA Fermi gamma
ray satellite. IceCube also isolated a flux of neutrinos from our own Galaxy,
which is not a dominant feature of the neutrino sky unlike what is observed
for all wavelength of light. Cosmic ray accelerators must exist in other
galaxies that are not present in our own, possibly the active supermassive
black hole. The discovery of the galaxy NGC 1068 and other such sources
confirmed the scenario where neutrinos are indeed produced in the dense
gamma-ray obscured cores of active galaxies. Finally, we speculate that
similar neutrino processes are characteristic of the accreting black holes in
Galactic X-ray binaries, despite of their different masses and physical
sizes."
