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Observation of gravitational waves from the coalescence of a 2.5–4.5 M ⊙ compact object and a neutron star

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  • معلومة اضافية
    • بيانات النشر:
      IOP Publishing
    • الموضوع:
      2024
    • Collection:
      University of Glasgow: Enlighten - Publications
    • نبذة مختصرة :
      We report the observation of a coalescing compact binary with component masses 2.5-4.5~M_\odot and 1.2-2.0~M_\odot (all measurements quoted at the 90% credible level). The gravitational-wave signal GW230529_181500 was observed during the fourth observing run of the LIGO--Virgo--KAGRA detector network on 2023 May 29 by the LIGO Livingston Observatory. The primary component of the source has a mass less than 5~M_\odot at 99% credibility. We cannot definitively determine from gravitational-wave data alone whether either component of the source is a neutron star or a black hole. However, given existing estimates of the maximum neutron star mass, we find the most probable interpretation of the source to be the coalescence of a neutron star with a black hole that has a mass between the most massive neutron stars and the least massive black holes observed in the Galaxy. We provisionally estimate a merger rate density of 55^{+127}_{-47} Gpc^{-3} yr^{-1} for compact binary coalescences with properties similar to the source of GW230529_181500; assuming that the source is a neutron star--black hole merger, GW230529_181500-like sources constitute about 60% of the total merger rate inferred for neutron star--black hole coalescences. The discovery of this system implies an increase in the expected rate of neutron star--black hole mergers with electromagnetic counterparts and provides further evidence for compact objects existing within the purported lower mass gap.
    • File Description:
      text
    • Relation:
      https://eprints.gla.ac.uk/330684/2/330684.pdf; Abac, A. G. et al. (2024) Observation of gravitational waves from the coalescence of a 2.5–4.5 M ⊙ compact object and a neutron star. Astrophysical Journal Letters , 970(2), L34. (doi:10.3847/2041-8213/ad5beb )
    • Rights:
      cc_by_4
    • الرقم المعرف:
      edsbas.C531A107