The maximum offsets of binary neutron star mergers from host galaxies
Ilya Mandel, Om Sharan Salafia, Andrew Levan, Paul Disberg
arXiv:2512.12018v2 Announce Type: replace
Abstract: We analytically derive, and illustrate with a population synthesis model, the maximum offset of binary neutron star mergers ejected from their host galaxies. This approximate maximum offset is 300 kpc $times (v_mathrm{esc} / 500 mathrm{km} mathrm{s}^{-1})^{-7}$, where $v_mathrm{esc}$ is the escape velocity from the host galaxy. Massive hosts with high escape velocities are unlikely to yield very large offsets. This maximum offset should inform the host associations of mergers that are not coincident with galaxies. We also discuss potential correlations between offsets and system masses, and possibly the duration of the gamma-ray burst accompanying the merger.arXiv:2512.12018v2 Announce Type: replace
Abstract: We analytically derive, and illustrate with a population synthesis model, the maximum offset of binary neutron star mergers ejected from their host galaxies. This approximate maximum offset is 300 kpc $times (v_mathrm{esc} / 500 mathrm{km} mathrm{s}^{-1})^{-7}$, where $v_mathrm{esc}$ is the escape velocity from the host galaxy. Massive hosts with high escape velocities are unlikely to yield very large offsets. This maximum offset should inform the host associations of mergers that are not coincident with galaxies. We also discuss potential correlations between offsets and system masses, and possibly the duration of the gamma-ray burst accompanying the merger.

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