Properties of the binary black hole merger GW150914

Abstract : On September 14, 2015, the Laser Interferometer Gravitational-wave Observatory (LIGO) detected a gravitational-wave transient (GW150914); we characterise the properties of the source and its parameters. The data around the time of the event were analysed coherently across the LIGO network using a suite of accurate waveform models that describe gravitational waves from a compact binary system in general relativity. GW150914 was produced by a nearly equal mass binary black hole of $36^{+5}_{-4} M_\odot$ and $29^{+4}_{-4} M_\odot$ (for each parameter we report the median value and the range of the 90% credible interval). The dimensionless spin magnitude of the more massive black hole is bound to be $0.7$ (at 90% probability). The luminosity distance to the source is $410^{+160}_{-180}$ Mpc, corresponding to a redshift $0.09^{+0.03}_{-0.04}$ assuming standard cosmology. The source location is constrained to an annulus section of $590$ deg$^2$, primarily in the southern hemisphere. The binary merges into a black hole of $62^{+4}_{-4} M_\odot$ and spin $0.67^{+0.05}_{-0.07}$. This black hole is significantly more massive than any other known in the stellar-mass regime.
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Contributor : Dominique Girod <>
Submitted on : Monday, February 15, 2016 - 11:13:12 AM
Last modification on : Thursday, September 12, 2019 - 9:58:10 AM

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B.P. Abbott, G. Cagnoli, J. Degallaix, V. Dolique, R. Flaminio, et al.. Properties of the binary black hole merger GW150914. Physical Review Letters, American Physical Society, 2016, 116, pp.241102. ⟨10.1103/PhysRevLett.116.241102⟩. ⟨in2p3-01274010⟩

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