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- Title
Formation of close binary black holes merging due to gravitational-wave radiation.
- Authors
Tutukov, A.; Cherepashchuk, A.
- Abstract
The conditions for the formation of close-binary black-hole systems merging over the Hubble time due to gravitational-wave radiation are considered in the framework of current ideas about the evolution of massive close-binary systems. The original systems whose mergers were detected by LIGO consisted of main-sequence stars with masses of 30-100 M . The preservation of the compactness of a binary black hole during the evolution of its components requires either the formation of a common envelope, probably also with a low initial abundance of metals, or the presence of a 'kick'-a velocity obtained during a supernova explosion accompanied by the formation of a black hole. In principle, such a kick can explain the relatively low frequency of mergers of the components of close-binary stellar black holes, if the characteristic speed of the kick exceeds the orbital velocities of the system components during the supernova explosion. Another opportunity for the components of close-binary systems to approach each other is related to their possible motion in a dense molecular cloud.
- Subjects
BINARY black holes; GRAVITATIONAL waves; HUBBLE deep field; MAIN sequence (Astronomy); LASER Interferometer Gravitational-Wave Observatory
- Publication
Astronomy Reports, 2017, Vol 61, Issue 10, p833
- ISSN
1063-7729
- Publication type
Article
- DOI
10.1134/S1063772917100092