Testing the No-Hair Theorem with Iron Lines

Johannsen & Psaltis (2011) constructed a Kerr-like metric that depends on an additional parameter, which measures potential deviations from the Kerr metric.

Johannsen & Psaltis (2013) simulated iron line profiles in this metric, demonstrating that this method can be used to test the no-hair theorem.

A selection of iron line profiles is available for download here.