We report the observation of a gravitational-wave signal produced by the coalescence of two stellar-mass black holes. The signal, GW151226, was observed by the twin detectors of the Laser Interferometer Gravitational-Wave Observatory (LIGO) on December 26, 2015 at 03:38:53 UTC. The signal was initially identified within 70 s by an online matched-filter search targeting binary coalescences. Subsequent off-line analyses recovered GW151226 with a network signal-to-noise ratio of 13 and a significance greater than 5σ. The signal persisted in the LIGO frequency band for approximately 1 s, increasing in frequency and amplitude over about 55 cycles from 35 to 450 Hz, and reached a peak gravitational strain of 3.4 þ0.7 −0.9 × 10−22. The inferred source-frame initial black hole masses are 14.2 þ8.3 −3.7M⊙ and 7.5 þ2.3 −2.3M⊙, and the final black hole mass is 20.8 þ6.1 −1.7M⊙.We find that at least one of the component black holes has spin greater than 0.2. This source is located at a luminosity distance of 440 þ180 −190 Mpc corresponding to a redshift of 0.09 þ0.03 −0.04 . All uncertainties define a 90% credible interval. This second gravitational-wave observation provides improved constraints on stellar populations and on deviations from general relativity.

GW151226: observation of gravitational waves from a 22-solar-mass binary black hole coalescence / Abbott, B.P., Abbott, R., Abbott, T.D., Abernathy, M.R., Acernese, F., Ackley, K., Adams, C., Adams, T., Addesso, P., Adhikari, R.X., Adya, V.B., Affeldt, C., Agathos, M., Agatsuma, K., Aggarwal, N., Aguiar, O.D., Aiello, L., Ain, A., Ajith, P., Allen, B., et al.. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 116:24(2016). [10.1103/PhysRevLett.116.241103]

GW151226: observation of gravitational waves from a 22-solar-mass binary black hole coalescence

Casentini, C.;Di Pace, S.;Di Palma, I.;Drago, M.;Frasca, S.;Leaci, P.;Majorana, E.;Mangano, V.;Mastrogiovanni, S.;Mezzani, F.;Naticchioni, L.;Pannarale, F.;Piccinni, O. J.;Rapagnani, P.;Ricci, F.;Salemi, F.;Di Giovanni, M.
2016

Abstract

We report the observation of a gravitational-wave signal produced by the coalescence of two stellar-mass black holes. The signal, GW151226, was observed by the twin detectors of the Laser Interferometer Gravitational-Wave Observatory (LIGO) on December 26, 2015 at 03:38:53 UTC. The signal was initially identified within 70 s by an online matched-filter search targeting binary coalescences. Subsequent off-line analyses recovered GW151226 with a network signal-to-noise ratio of 13 and a significance greater than 5σ. The signal persisted in the LIGO frequency band for approximately 1 s, increasing in frequency and amplitude over about 55 cycles from 35 to 450 Hz, and reached a peak gravitational strain of 3.4 þ0.7 −0.9 × 10−22. The inferred source-frame initial black hole masses are 14.2 þ8.3 −3.7M⊙ and 7.5 þ2.3 −2.3M⊙, and the final black hole mass is 20.8 þ6.1 −1.7M⊙.We find that at least one of the component black holes has spin greater than 0.2. This source is located at a luminosity distance of 440 þ180 −190 Mpc corresponding to a redshift of 0.09 þ0.03 −0.04 . All uncertainties define a 90% credible interval. This second gravitational-wave observation provides improved constraints on stellar populations and on deviations from general relativity.
2016
gravitational waves; LIGO; binary black hole
01 Pubblicazione su rivista::01a Articolo in rivista
GW151226: observation of gravitational waves from a 22-solar-mass binary black hole coalescence / Abbott, B.P., Abbott, R., Abbott, T.D., Abernathy, M.R., Acernese, F., Ackley, K., Adams, C., Adams, T., Addesso, P., Adhikari, R.X., Adya, V.B., Affeldt, C., Agathos, M., Agatsuma, K., Aggarwal, N., Aguiar, O.D., Aiello, L., Ain, A., Ajith, P., Allen, B., et al.. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 116:24(2016). [10.1103/PhysRevLett.116.241103]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/928778
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