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Resumen:

The primordial population of massive stars (Pop III stars) and galaxies formed during the first few hundred million years after the Big bang have not been observed in the deepest observations with the Hubble telescope, and are likely to remain unobserved directly in the foreseeable future, even with the James Web Telescope (JWST). Presently, there are  indications from several areas of observational astrophysics that the star formation rate densities (SFRD) at redshifts z>11, are larger than those extrapolated from the Hubble observations in the rest frame ultraviolet of galaxies up to redshift z=11.

In this talk I will show how the total number and formation rate of Pop III stars at redshifts z>18 may be constrained indirectly by observations with single dipole arrays and interferometers like the Square Kilometer Array (SKA) of the signatures in the redshifted 21cm line of atomic hydrogen of Pop III microquasars, which are the promptly formed black hole (BH) remnants of Pop III stars.