Hidden source of high-energy neutrinos in collapsing galactic nucleus

Abstract

We propose the model of a short-lived very powerful source of high energy neutrinos. It is formed as a result of the dynamical evolution of a galactic nucleus prior to its collapse into a massive black hole and formation of high-luminosity AGN. This stage can be referred to as "pre-AGN". A dense central stellar cluster in the galactic nucleus on the late stage of evolution consists of compact stars (neutron stars and stellar mass black holes). This cluster is sunk deep into massive gas envelope produced by destructive collisions of a primary stellar population. Frequent collisions of neutron stars in a central stellar cluster are accompanied by the generation of ultrarelativistic fireballs and shock waves. These repeating fireballs result in a formation of the expanding rarefied cavity inside the envelope. The charged particles are effectively accelerated in the cavity and, due to pp-collisions in the gas envelope, they produce high energy neutrinos. All high energy particles, except neutrinos, are absorbed in the thick envelope. Duration of this pre-AGN phase is ∼ 10 yr, the number of the sources can be ∼ 10 per cosmological horizon. High energy neutrino signal can be detected by underground neutrino telescope with effective area S ∼ 1 km 2 .

Shock propagation following an intense explosion: comparison between hydrodynamics and simulations

“…In some physical systems, there is a continuous input of energy in a localized region. The TvNS theory has been extended to describe such cases both analytically [14] as well as numerically [15], and is relevant for early stage of supernova explosions, powerful wind from stars and hidden neutrino sources [16], and for interstellar bubbles [17,18] . Other generalizations include the effect of including heat conduction [19][20][21], viscous effect [22][23][24][25] and implosions [26][27][28][29][30][31].…”