  In large and complicated stellar systems like galaxies it is difficult to
predict the number and characteristics of a black hole population. Such
populations may be modelled as an aggregation of homogeneous (i.e. having
uniform star formation history and the same initial chemical composition)
stellar populations. Using realistic evolutionary models we predict the
abundances and properties of black holes formed from binaries in these
environments. We show that the black hole population will be dominated by
single black holes originating from binary disruptions and stellar mergers.
Furthermore, we discuss how black hole populations are influenced by such
factors as initial parameters, metallicity, initial mass function, and natal
kick models. As an example application of our results, we estimate that about
26 microlensing events to happen every year in the direction of the Galactic
Bulge due to black holes in a survey like OGLE-IV. Our results may be used to
perform in-depth studies related to realistic black hole populations, e.g.
observational predictions for space survey missions like Gaia, or Einstein
Probe. We prepared a publicly available database with the raw data from our
simulations to be used for more in-depth studies.
