Abstract
It is described the astrophysical model of a short-lived and very powerful hidden source of high-energy neutrinos. This source is formed as a result of dynamical evolution of a galactic nucleus prior to its collapse into the massive black hole. A dense central stellar cluster in the galactic nucleus on the late stage of evolution consists of neutron stars and stellar mass black holes deep inside the massive gas envelope produced by destructive collisions of a primary stellar population. Frequent collisions of neutron stars result in a creation of an expanding rarefied cavity in the envelope. Particles are effectively accelerated in the cavity and, due to pp-collisions in the gas envelope, they produce high-energy neutrinos. High-energy neutrino signal can be detected by underground neutrino telescope with effective area S ∼ 1 km 2.
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