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In this work, we investigate the electromagnetic energy released byastrophysical black holes within the Kerr-Taub-NUT solution, which describesrotating black holes with a nonvanishing gravitomagnetic charge. In our study,we consider the black holes in the X-ray binary systems GRS 1915+105, GROJ1655-40, XTE J1550-564, A0620-00, H1743-322, and GRS 1124-683. We show thatthe Kerr-Taub-NUT spacetime can explain the radiative efficiency of thesesources inferred from the continuum fitting method (CFM). We also show that, inthe framework of the Blandford-Znajeck mechanism, it is possible to reproducethe observed jet power. We unify the results of the two analyses for theselected objects to get more stringent constraints on the spacetime parameters.We show that, as in the case of the Kerr spacetime, the Kerr-Taub-NUT solutioncannot simultaneously explain the observed jet power and radiative efficiencyof GRS 1915+105.

Kerr-Taub-NUT spacetime to explain the jet power and the radiative efficiency of astrophysical black holes