Testing the Kerr hypothesis using X-ray reflection spectroscopy with NuSTAR data of Cygnus X-1 in the soft state

Askar B. Abdikamalov; Cosimo Bambi; Dimitry Ayzenberg; Honghui Liu; Javier A. Garcia; Sourabh Nampalliwar; Thomas Dauser

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Testing the Kerr hypothesis using X-ray reflection spectroscopy with NuSTAR data of Cygnus X-1 in the soft state

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arxiv 1904.08027 v2 pith:FGM57NEH submitted 2019-04-17 gr-qc astro-ph.HE

Honghui Liu , Askar B. Abdikamalov , Dimitry Ayzenberg , Cosimo Bambi , Thomas Dauser , Javier A. Garcia , Sourabh Nampalliwar This is my paper

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keywords cygnusreflectionspectroscopyx-raynustarsoftstateanalysis

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We continue exploring the constraining capabilities of X-ray reflection spectroscopy to test the Kerr-nature of astrophysical black holes and we present the results of our analysis of two NuSTAR observations of Cygnus X-1 in the soft state. We find that the final measurement can strongly depend on the assumption of the intensity profile. We conclude that Cygnus X-1 is not suitable for tests of general relativity using X-ray reflection spectroscopy and we discuss the desired properties of a source to be a good candidate for our studies.

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