Disc accretion onto a binary black hole in a hierarchical triple system as an origin of the most luminous hyper-soft sources
Abstract
We propose that the recently discovered luminous hypersoft X-ray sources can be explained by accretion onto a binary black hole in a hierarchical triple system. For black hole masses 15 M, the orbital separation of the internal binary might be 0.01 ~AU. If the donor provides 10-8 M yr-1, then the circumbinary accretion disc can explain the observed properties of the most luminous supersoft sources.
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