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Binary black holes are the primary endpoint of massive stellar evolution.Their properties provide a unique opportunity to constrain binary evolution,which is still poorly understood. In this paper, we predict the inventory ofbinary black holes and their merger products in/around the Milky Way, anddetail their main properties. We present the first combination of ahigh-resolution cosmological simulation of a Milky Way-mass galaxy with abinary population synthesis model. The hydrodynamic simulation, taken from theFIRE project, provides a cosmologically realistic star formation history forthe galaxy and its stellar halo and satellites. We apply ametallicity-dependent evolutionary model to the star particles to produceindividual binary black holes. We find that a million binary black holes havemerged in the model Milky Way, and 3 million binaries are still present, withan average mass of 28 Msun per binary. Because the black hole progenitors arebiased towards low metallicity stars, half reside in the stellar halo andsatellites and 40 per cent of the binaries were formed outside the main galaxy.This trend increases with the masses of the black holes. The numbers and massdistribution of the merged systems is compatible with the LIGO/Virgodetections. Observations of these black holes will be challenging, both withelectromagnetic methods and LISA. We find that a cosmologically realistic starformation history, with self-consistent metal enrichment and Galactic accretionhistory, are key ingredients for determining binary black hole rates that canbe compared with observations to constrain massive binary evolution.

Predicting the binary black hole population of the Milky Way with cosmological simulations