Astrophysical implications of the binary black hole merger GW150914

LIGO Scientific Collaboration and Virgo Collaboration

Research output: Contribution to journalArticleResearchpeer-review

Abstract

The discovery of the gravitational-wave (GW) source GW150914 with the Advanced LIGO detectors provides the first observational evidence for the existence of binary black hole (BH) systems that inspiral and merge within the age of the universe. Such BH mergers have been predicted in two main types of formation models, involving isolated binaries in galactic fields or dynamical interactions in young and old dense stellar environments. The measured masses robustly demonstrate that relatively "heavy" BHs (≳25 M) can form in nature. This discovery implies relatively weak massive-star winds and thus the formation of GW150914 in an environment with a metallicity lower than about 1/2 of the solar value. The rate of binary-BH (BBH) mergers inferred from the observation of GW150914 is consistent with the higher end of rate predictions (≳1 Gpc-3yr?1) from both types of formation models. The low measured redshift (z ≃ 0.1) of GW150914 and the low inferred metallicity of the stellar progenitor imply either BBH formation in a low-mass galaxy in the local universe and a prompt merger, or formation at high redshift with a time delay between formation and merger of several Gyr. This discovery motivates further studies of binary-BH formation astrophysics. It also has implications for future detections and studies by Advanced LIGO and Advanced Virgo, and GW detectors in space.

Original languageEnglish
Article numberL22
Number of pages15
JournalThe Astrophysical Journal Letters
Volume818
Issue number2
DOIs
Publication statusPublished - 20 Feb 2016

Keywords

  • gravitational waves
  • stars: black holes
  • stars: massive

Cite this

LIGO Scientific Collaboration and Virgo Collaboration. / Astrophysical implications of the binary black hole merger GW150914. In: The Astrophysical Journal Letters. 2016 ; Vol. 818, No. 2.
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abstract = "The discovery of the gravitational-wave (GW) source GW150914 with the Advanced LIGO detectors provides the first observational evidence for the existence of binary black hole (BH) systems that inspiral and merge within the age of the universe. Such BH mergers have been predicted in two main types of formation models, involving isolated binaries in galactic fields or dynamical interactions in young and old dense stellar environments. The measured masses robustly demonstrate that relatively {"}heavy{"} BHs (≳25 M⊙) can form in nature. This discovery implies relatively weak massive-star winds and thus the formation of GW150914 in an environment with a metallicity lower than about 1/2 of the solar value. The rate of binary-BH (BBH) mergers inferred from the observation of GW150914 is consistent with the higher end of rate predictions (≳1 Gpc-3yr?1) from both types of formation models. The low measured redshift (z ≃ 0.1) of GW150914 and the low inferred metallicity of the stellar progenitor imply either BBH formation in a low-mass galaxy in the local universe and a prompt merger, or formation at high redshift with a time delay between formation and merger of several Gyr. This discovery motivates further studies of binary-BH formation astrophysics. It also has implications for future detections and studies by Advanced LIGO and Advanced Virgo, and GW detectors in space.",
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author = "B.P. Abbott and R. Abbott and T.D. Abbott and M.R. Abernathy and f. Acernese and K. Ackley and C. Adams and T. Adams and P. Addesso and R.X. Adhikari and Adya, {V. B.} and C. Affeldt and M. Agathos and K. Agatsuma and N. Aggarwal and O.D. Aguiar and L. Aiello and A. Ain and P. Ajith and B. Allen and G Ashton and P.D. Lasky and Y. Levin and S.S. Premachandra and L.M. Sammut and E. Thrane and R.J.E Smith and X.J Zhu and {LIGO Scientific Collaboration and Virgo Collaboration} and Ilya Mandel",
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Astrophysical implications of the binary black hole merger GW150914. / LIGO Scientific Collaboration and Virgo Collaboration.

In: The Astrophysical Journal Letters, Vol. 818, No. 2, L22, 20.02.2016.

Research output: Contribution to journalArticleResearchpeer-review

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AU - Ackley, K.

AU - Adams, C.

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AU - Aggarwal, N.

AU - Aguiar, O.D.

AU - Aiello, L.

AU - Ain, A.

AU - Ajith, P.

AU - Allen, B.

AU - Ashton, G

AU - Lasky, P.D.

AU - Levin, Y.

AU - Premachandra, S.S.

AU - Sammut, L.M.

AU - Thrane, E.

AU - Smith, R.J.E

AU - Zhu, X.J

AU - LIGO Scientific Collaboration and Virgo Collaboration

AU - Mandel, Ilya

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KW - stars: black holes

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