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Compact binaries such as double neutron stars or a neutron star paired with ablack-hole, are strong sources of gravitational waves during coalescence andalso the likely progenitors of various electromagnetic phenomena, notablyshort-duration gamma-ray bursts (SGRBs), and kilonovae. In this work, wegenerate populations of synthetic binaries and place them in galaxies from thelarge-scale hydrodynamical galaxy evolution simulation EAGLE. With our zELDAcode, binaries are seeded in proportion to star formation rate, and we followtheir evolution to merger using both the BPASS and COSMIC binary stellarevolution codes. We track their dynamical evolution within their host galaxypotential, to estimate the galactocentric distance at the time of the merger.Finally, we apply observational selection criteria to allow comparison of thismodel population with the legacy sample of SGRBs. We find a reasonableagreement with the redshift distribution (peaking at $0.5<z<1$), hostmorphologies and projected galactocentric offsets (modal impact parameter$\lesssim10$ kpc). Depending on the binary simulation used, we predict$\sim16-35\%$ of SGRB events would appear "host-less", i.e. sources that mergewith high impact parameters or have hosts fainter than the detection limit($H>26$).

Exploring compact binary merger host galaxies and environments with $\rm{zELDA}$