Neutrino production in Population III microquasars

AGUSTÍN M. CARULLI; MATIAS M. REYNOSO; GUSTAVO E. ROMERO

Congreso; Second Binational Meeting AAA-SOCHIAS 2018; 2018

Context: Population III microquasars (PopIII MQs) may have been one of the main contributors to the reionization of the intergalactic medium (IGM). Since it is thought that PopIII stars were formed at redshiftsz ∼ 20 − 30, the only particles produced by these astrophysical sources capable of being detected at the present are neutrinos, since they rarely interact with matter.Aims: We develop a model that accounts for the neutrino production in PopIII MQs and compare the diffuse neutrino fluxes obtained for different parameters with the available data from IceCube neutrino telescope.Method: We express a transport equation for the different zones considered along the jets. In those zones where particles are accelerated by some mechanism (e.g diffusive shocks), we use a One-Zone aproximation. The distribution of particles obtained in each zone, is then re-injected into the succesive zone. We compute the distributions of primary particles (i.e protons and electrons) in each zone, which cool down due to radiative processes and also interact with other particle targets, to give a distribution of secondary particles (i.e muons and pions). We thenget the muons and pions distributions and compute their decayments, from which we obtain a neutrino output in the frame of the jet. Finally, we integrate with respect to the redshift z and over the angles, to obtain the diffuse neutrino flux that may be observed from the Earth.