tokens: ACKNOWLEDGEMENTS We thank the referee, Matthew Benacquista, for his useful comments. We also thank Emanuele Ripamonti, Alessandro Bressan, Elena D’Onghia, and Gijs Nelemans for useful discussions. We warmly thank The Illustris team for making their simulations publicly available. Numerical calculations have been performed through a CINECA-INFN agreement and through a CINECA-INAF agreement, providing access to resources on GALILEO and MARCONI at CINECA. MM acknowledges financial support from the MERAC Foundation through grant ‘The physics of gas and protoplanetary discs in the Galactic centre’, from INAF through PRIN-SKA ‘Opening a new era in pulsars and compact objects science with MeerKat’, from MIUR through Progetto Premiale ’FIGARO’ (Fostering Italian Leadership in the Field of Gravitational Wave Astrophysics) and ’MITiC’ (MIning The Cosmos Big Data and Innovative Italian Technology for Frontier Astrophysics and Cosmology), and from the Austrian National Science Foundation through FWF stand-alone grant P31154-N27 ‘Unraveling merging neutron stars and black hole – neutron star binaries with population-synthesis simulations’. NG acknowledges financial support from Fondazione Ing. Aldo Gini and thanks the Institute for Astrophysics and Particle Physics of the University of Innsbruck for hosting him during the preparation of this paper. This work benefited from support by the International Space Science Institute (ISSI), Bern, Switzerland, through its International Team programme ref. no. 393 The Evolution of Rich Stellar Populations BH Binaries (2017-18).
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