Speaker
Description
The first population of X-ray binaries are expected to affect the thermal and ionization states of the gas in the early Universe. Although these X-ray sources are predicted to have important implications for high-redshift observable signals, such as the hydrogen 21-cm signal from cosmic dawn and the cosmic X-ray background, their properties are poorly explored and theoretical models are lacking detail. In this talk I will present the first model a population of X-ray binaries arising from zero metallicity stars. We explore how properties of the first X-ray binaries depend on the adopted initial mass function (IMF) of primordial stars, finding a strong effect on their number and X-ray production efficiency. We also present scaling relations between XRBs and their X-ray feedback with the local star formation rate which can be used in sub-grid models to improve the X-ray feedback prescriptions.
