GW190425: Observation of a Compact Binary Coalescence with Total Mass ∼ 3.4Mстатья
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Дата последнего поиска статьи во внешних источниках: 12 августа 2020 г.
Аннотация:On 2019 April 25, the LIGO Livingston detector observed a compact binary coalescence with signal-to-noise ratio12.9. The Virgo detector was also taking data that did not contribute to detection due to a low signal-to-noise ratio,but were used for subsequent parameter estimation. The 90% credible intervals for the component masses rangefrom1.12 to 2.52 M (1.46–1.87 M if we restrict the dimensionless component spin magnitudes to be smaller than0.05). These mass parameters are consistent with the individual binary components being neutron stars. However,both the source-frame chirp mass - 1.44+0.020.02 M and the total mass - 3.4+0.10.3M of this system are significantly largerthan those of any other known binary neutron star (BNS) system. The possibility that one or both binarycomponents of the system are black holes cannot be ruled out from gravitational-wave data. We discuss possibleorigins of the system based on its inconsistency with the known Galactic BNS population. Under the assumptionthat the signal was produced by a BNS coalescence, the local rate of neutron star mergers is updated to250–2810 Gpc yr - - 3 1.