Advances in Astronomy / 2012 / Article / Fig 4

Review Article

Testing the No-Hair Theorem with Sgr A*

Figure 4

Images of rings of light of (a) a Kerr and (b) a quasi-Kerr black hole at an inclination . Increasing values of the spin cause a displacement of the ring in the image plane, but the ring remains (nearly) circular for values of the spin  M (a). Nonzero values of the deviation parameter (b) lead to an asymmetric ring image [23].

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