CYG X-3: A galactic double black hole or black-hole-neutron-star progenitor

Krzysztof Belczynski, Tomasz Bulik, Ilya Mandel, B. S. Sathyaprakash, Andrzej A. Zdziarski, Joanna Mikołajewska

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Abstract

There are no known stellar-origin double black hole (BH-BH) or black-hole-neutron-star (BH-NS) systems. We argue that Cyg X-3 is a very likely BH-BH or BH-NS progenitor. This Galactic X-ray binary consists of a compact object, wind-fed by a Wolf-Rayet (W-R) type companion. Based on a comprehensive analysis of observational data, it was recently argued that Cyg X-3 harbors a 2-4.5 M black hole (BH) and a 7.5-14.2 M W-R companion. We find that the fate of such a binary leads to the prompt (≲ 1 Myr) formation of a close BH-BH system for the high end of the allowed W-R mass (MW-R ≳ 13 M). For the low- to mid-mass range of the W-R star (MW-R ∼ 7-10 M) Cyg X-3 is most likely (probability 70%) disrupted when W-R ends up as a supernova. However, with smaller probability, it may form a wide (15%) or a close (15%) BH-NS system. The advanced LIGO/VIRGO detection rate for mergers of BH-BH systems from the Cyg X-3 formation channel is ∼10 yr-1, while it drops down to ∼0.1 yr-1 for BH-NS systems. If Cyg X-3 in fact hosts a low-mass black hole and massive W-R star, it lends additional support for the existence of BH-BH/BH-NS systems.

Original languageEnglish (US)
Article number96
JournalAstrophysical Journal
Volume764
Issue number1
DOIs
StatePublished - Feb 10 2013

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neutron stars
merger
harbor
wolves
Wolf-Rayet stars
LIGO (observatory)
harbors
massive stars
supernovae
detection
analysis
rate

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Belczynski, Krzysztof ; Bulik, Tomasz ; Mandel, Ilya ; Sathyaprakash, B. S. ; Zdziarski, Andrzej A. ; Mikołajewska, Joanna. / CYG X-3 : A galactic double black hole or black-hole-neutron-star progenitor. In: Astrophysical Journal. 2013 ; Vol. 764, No. 1.
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abstract = "There are no known stellar-origin double black hole (BH-BH) or black-hole-neutron-star (BH-NS) systems. We argue that Cyg X-3 is a very likely BH-BH or BH-NS progenitor. This Galactic X-ray binary consists of a compact object, wind-fed by a Wolf-Rayet (W-R) type companion. Based on a comprehensive analysis of observational data, it was recently argued that Cyg X-3 harbors a 2-4.5 M⊙ black hole (BH) and a 7.5-14.2 M⊙ W-R companion. We find that the fate of such a binary leads to the prompt (≲ 1 Myr) formation of a close BH-BH system for the high end of the allowed W-R mass (M⊙W-R ≳ 13 M⊙). For the low- to mid-mass range of the W-R star (M⊙W-R ∼ 7-10 M⊙) Cyg X-3 is most likely (probability 70{\%}) disrupted when W-R ends up as a supernova. However, with smaller probability, it may form a wide (15{\%}) or a close (15{\%}) BH-NS system. The advanced LIGO/VIRGO detection rate for mergers of BH-BH systems from the Cyg X-3 formation channel is ∼10 yr-1, while it drops down to ∼0.1 yr-1 for BH-NS systems. If Cyg X-3 in fact hosts a low-mass black hole and massive W-R star, it lends additional support for the existence of BH-BH/BH-NS systems.",
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CYG X-3 : A galactic double black hole or black-hole-neutron-star progenitor. / Belczynski, Krzysztof; Bulik, Tomasz; Mandel, Ilya; Sathyaprakash, B. S.; Zdziarski, Andrzej A.; Mikołajewska, Joanna.

In: Astrophysical Journal, Vol. 764, No. 1, 96, 10.02.2013.

Research output: Contribution to journalArticle

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