The Maximum Offsets of Binary Neutron Star Mergers from Host Galaxies

Ilya Mandel; Om Sharan Salafia; Andrew Levan; Paul Disberg

doi:10.3847/2041-8213/ae4332

The Maximum Offsets of Binary Neutron Star Mergers from Host Galaxies

Ilya Mandel (School of Physics and Astronomy, Monash University , Clayton, VIC 3800, Australia ; [email protected]; The ARC Centre of Excellence for Gravitational Wave Discovery–OzGrav , Australia) iD Om Sharan Salafia (INAF—Osservatorio Astronomico di Brera , via Brera 28, I-20121 Milano (MI), Italy; INFN—sezione di Milano-Bicocca , Piazza della Scienza 3, I-20126 Milano (MI), Italy) Andrew Levan (Department of Astrophysics/IMAPP, Radboud University , 6525 AJ Nijmegen, The Netherlands; Department of Physics, University of Warwick , Coventry, UK) Paul Disberg (School of Physics and Astronomy, Monash University , Clayton, VIC 3800, Australia ; [email protected]; The ARC Centre of Excellence for Gravitational Wave Discovery–OzGrav , Australia) iD

Journal: The Astrophysical Journal Letters • 2026-01-01 • IOP Publishing • ISSN: 2041-8205

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 $\times \,{({v}_{{\rm{esc}}}/500\,{\rm{km}}\,{{\rm{s}}}^{-1})}^{-7}$ , where v _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.

Subjects & Keywords

# Astrophysics # Gamma-ray bursts # Neutron stars

How to Cite this Article

                    Ilya Mandel, Om Sharan Salafia, Andrew Levan, et al. (2026). "The Maximum Offsets of Binary Neutron Star Mergers from Host Galaxies". The Astrophysical Journal Letters. https://doi.org/10.3847/2041-8213/ae4332                

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DOI: 10.3847/2041-8213/ae4332 ↗
Primary Index: DOAJ