A model for microquasars of Population III

Abstract

Current simulations indicate that the first stars were formed predominantly in binary systems. The study of the contribution of the first accreting binary systems to the reionization and heating of the intergalactic medium requires the formulation of a concrete model for microquasars of Population III. We aim at constructing a complete model for microquasars where the donor star is of Population III. We consider that the mas-loss of the star is caused exclusively by the spill of matter through the Roche lobe towards the black hole. We calculate the spectral energy distribution of the radiation produced by the accretion disk, the radiation-pressure driven wind, and the relativistic particles in the jets, within the framework of a lepto-hadronic model. In addition, we estimate the impact on the reionization by the first microquasars. We determine that Population III microquasars are powerful sources of ultraviolet radiation produced by the winds of their super-critical disks, and generate a broadband non-thermal emission in jets. Our results indicate that microquasars in the early Universe could have been important for the reionization and heating of the intergalactic medium.

12 pages, 9 figures, accepted for publication in Astronomy & Astrophysics

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• Population III microquasars

Cited by in corpus (5)

• Mechanical feedback effects on primordial black hole accretion
• Neutrino production in Population III microquasars
• Cosmic-ray production from neutron escape in microquasar jets
• Electromagnetic signatures of black hole clusters in the center of super-Eddington galaxies
• Super-Accreting Active Galactic Nuclei as Neutrino Sources