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Probing the near-horizon region of Cygnus X-1 with Suzaku and NuSTAR

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arxiv 2012.01112 v2 pith:2WEOH4HT submitted 2020-12-02 astro-ph.HE gr-qc

Zuobin Zhang , Honghui Liu , Askar B. Abdikamalov , Dimitry Ayzenberg , Cosimo Bambi , Menglei Zhou This is my paper
classification astro-ph.HEgr-qc
keywords cygnusnustarsuzakublackablealphaanalysisastrophysical
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abstract

Astrophysical black holes are ideal laboratories for testing Einstein's theory of general relativity in the strong field regime. In this manuscript, we present an analysis of Suzaku and NuSTAR spectra of the black hole binary Cygnus X-1 using RELXILL_NK. Unlike our previous study on Cygnus X-1 with NuSTAR data, here we are able to constrain the Johannsen deformation parameter $\alpha_{13}$. However, despite the high energy resolution near the iron line provided by Suzaku, our constraints on the Kerr metric from Cygnus X-1 are not very stringent in comparison with those that have been obtained from other sources, confirming that Cygnus X-1 is quite a complicated source.

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