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Constraining the Johannsen deformation parameter ɛ₃ with black hole x-ray data

Tripathi, Ashutosh; Abdikamalov, Askar B.; Ayzenberg, Dimitry +2 more

We extend our previous work on tests of the Kerr black hole hypothesis using x-ray reflection spectroscopy and we infer observational constraints on the Johannsen deformation parameter ɛ₃ . We analyze a NuSTAR observation of the stellar-mass black hole in GS 1354-645, Suzaku data of the supermassive black holes in Ark 564, 1H0419-577, a…