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Spectral lines are a powerful tool to gain important informa tion about black holes in X-ray binaries and active galactic nuclei. We present a semi-analytical so lution to determine the observed energy range of such relativistic spectral lines as a function of th e model parameters, namely, the emission radius, observer’s view angle, and the black hole spin. This is a continued work, where we already presented the solution for the systems with black holes with positive spin. Now we study the case of systems with negative spin. We compare the results for the se two different cases and discuss the dependence of minimum and maximum energy shifts on the mo del parameters.

Energy shifts of spectral lines from accretion discs near a black hole with negative spin