Abstract
A new approach of detecting the black hole spin in x-ray binaries isproposed based on the model of the coexistence of the Blandford–Znajek(BZ) and magnetic coupling (MC) processes, inwhich the BZ process is used to power the jet emissions from x-raybinaries, and high frequency quasi-periodic oscillations (QPOs)are explained by a rotating hotspot in the inner region of theaccretion disc surrounding a fast-spinning black hole. It is shown thatthe black hole spins of several x-ray binaries (XTE J1550-564, GROJ1665-40 and GRS 1915+105) can be constrained in a rather narrowrange, provided that QPOs and jets coexist in these sources.
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