Testing the No-Hair Theorem with Sgr A*

Figure 2

Radius of (a) the ISCO and of (b) the circular photon orbit as a function of the spin 𝑎 for several values of the parameter 𝜖₃. The radius of the ISCO and the circular photon orbit decrease with increasing values of the parameter 𝜖₃. The shaded region marks the excluded part of the parameter space [34].

(a)

(b)