mass ratio of $\sim 10^{-3}$ which is consistent with observations e.g., @Rix04. The lifetime of the early sources is very uncertain, though the sources are expected to be short-lived [@Meyn05]. Here we set the fiducial age to be $t_{\rm age}=20$ Myr.

The high-mass X-ray binaries could have been another potential source of X-rays in the galaxies. The shape of the SED of the HMXBs depends on the interstellar absorption of the soft X-ray photons and is very uncertain for the high redshift HMXBs. The SED of the HMXBs used throughout the paper is taken from @frag1 [@frag2]. Due to the significant amount of absorption of the soft X-rays in the interstellar medium of the galaxy, the soft X-ray part of the SED is almost absent from the intrinsic SED of the source. We call this model consisting of stars and HMXBs within galaxies as the [**HMXB model**]{}.

Baseline distribution of the SKA1-low {#ska_base_dist}
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An important component for simulating radio maps similar to those ones would obtain in observations is the baseline distribution of the telescope. The only telescope considered in this work is the SKA1-low which holds the promise of imaging the high redshift cosmological signal. As per the 