X-ray emission from helium star–black hole binaries as probes of tidally induced spin-up of second-born black holes

Open Access

Fig. 2.

Distribution of the estimated X-ray luminosity, L_X, with the predicted spin of the second-born BH, a_BH, 2, at the end of the He+BH phase from BSE (left) and StarTrack (right), for metallicities Z = 0.01 Z_⊙ (top) and Z_⊙ (bottom) and the SMT-dominated case.

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