On August 14, 2017 at 10∶30:43 UTC, the Advanced Virgo detector and the two Advanced LIGO detectors coherently observed a transient gravitational-wave signal produced by the coalescence of two stellar mass black holes, with a false-alarm rate of ≲1 in 27 000 years. The signal was observed with a three-detector network matched-filter signal-to-noise ratio of 18. The inferred masses of the initial black holes are 30.5 (+5.7, −3.0) M⊙ and 25.3 (+2.8, -4.2) M⊙ (at the 90% credible level). The luminosity distance of the source is 540 (+130, -210) Mpc, corresponding to a redshift of z = 0.11 (+0.03, -0.04). A network of three detectors improves the sky localization of the source, reducing the area of the 90% credible region from 1160 deg2 using only the two LIGO detectors to 60 deg2 using all three detectors. For the first time, we can test the nature of gravitational-wave polarizations from the antenna response of the LIGO-Virgo network, thus enabling a new class of phenomenological tests of gravity.

GW170814: A Three-Detector Observation of Gravitational Waves from a Binary Black Hole Coalescence

Baldaccini, F.;Bawaj, M.;Gammaitoni, L.;Marchesoni, F.;Punturo, M.;Travasso, F.;Vocca, H.;
2017

Abstract

On August 14, 2017 at 10∶30:43 UTC, the Advanced Virgo detector and the two Advanced LIGO detectors coherently observed a transient gravitational-wave signal produced by the coalescence of two stellar mass black holes, with a false-alarm rate of ≲1 in 27 000 years. The signal was observed with a three-detector network matched-filter signal-to-noise ratio of 18. The inferred masses of the initial black holes are 30.5 (+5.7, −3.0) M⊙ and 25.3 (+2.8, -4.2) M⊙ (at the 90% credible level). The luminosity distance of the source is 540 (+130, -210) Mpc, corresponding to a redshift of z = 0.11 (+0.03, -0.04). A network of three detectors improves the sky localization of the source, reducing the area of the 90% credible region from 1160 deg2 using only the two LIGO detectors to 60 deg2 using all three detectors. For the first time, we can test the nature of gravitational-wave polarizations from the antenna response of the LIGO-Virgo network, thus enabling a new class of phenomenological tests of gravity.
2017
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11391/1420883
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