GW190425: Observation of a Compact Binary Coalescence with Total Mass ~3.4 Msun

Other Versions:

LIGO-P190425-v10
24 Jul 2020, 10:36

Abstract:: On 2019 April 25, the LIGO Livingston detector observed a compact binary coalescence with signal-to-noise ratio 12.9. 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 range from 1.12 to 2.52 \(M_\odot\) (1.45 to 1.88 \(M_\odot\) if we restrict the dimensionless component spin magnitudes to be smaller than 0.05). These mass parameters are consistent with the individual binary components being neutron stars. However, both the source-frame chirp mass \(1.44^{+0.02}_{-0.02} M_\odot\) and the total mass \(3.4^{+0.3}_{-0.1}M_\odot\) of this system are significantly larger than those of any other known binary neutron star system. The possibility that one or both binary components of the system are black holes cannot be ruled out from gravitational-wave data. We discuss possible origins of the system based on its inconsistency with the known Galactic binary neutron star population. Under the assumption that the signal was produced by a binary neutron star coalescence, the local rate of neutron star mergers is updated to 250-2810 \(\text{Gpc}^{-3}\text{yr}^{-1}\).

Files in Document:

Other Files:

Figure 1 files (pdf, png, eps, svg) (Figure01.zip, file is not accessible)
Figure 10 files (pdf, png, svg) (Figure10.zip, file is not accessible)
Figure 11 files (pdf, png, svg) (Figure11.zip, file is not accessible)
Figure 12 files (pdf, png, svg) (Figure12.zip, file is not accessible)
Figure 13 files (pdf, png, svg) (Figure13.zip, file is not accessible)
Figure 14 files (pdf, png, eps, svg) (Figure14.zip, file is not accessible)
Figure 15 files (pdf, png, eps, svg) (Figure15.zip, file is not accessible)
Figure 16 files (pdf, png, eps, svg) (Figure16.zip, file is not accessible)
Figure 17 files (pdf, png, eps, svg) (Figure17.zip, file is not accessible)
Figure 18 files (pdf, png, eps, svg) (Figure18.zip, file is not accessible)
Figure 19 files (pdf, png, eps, svg) (Figure19.zip, file is not accessible)
Figure 2 files (pdf, png, svg, fits (flattened and unflattened)) (Figure02.zip, file is not accessible)
Figure 3 files (pdf, png, svg) (Figure03.zip, file is not accessible)
Figure 4 files (pdf, png, svg) (Figure04.zip, file is not accessible)
Figure 5 files (pdf, png, eps, svg) (Figure05.zip, file is not accessible)
Figure 6 files (pdf, png, eps, svg) (Figure06.zip, file is not accessible)
Figure 7 files (pdf, png, svg) (Figure07.zip, file is not accessible)
Figure 8 files (pdf, png, svg) (Figure08.zip, file is not accessible)
Figure 9 files (pdf, png, svg) (Figure09.zip, file is not accessible)

LIGO Document P190425-v7