Testing the No-Hair Theorem with Sgr A*

Figure 3

Contours of constant radius of the ISCO for values of the spin −1≤𝑎/M≤1 and of the parameter −10≤𝜖₃≤10. The radius of the ISCO decreases for increasing values of the spin and the parameter 𝜖₃. The shaded region marks the excluded part of the parameter space. The dashed line corresponds to the parameter space for a Kerr black hole [34].