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

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

doi:10.1103/PhysRevD.99.123007

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

General Relativity and Quantum Cosmology 2019-06-12 v2 High Energy Astrophysical Phenomena

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

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Abstract

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.

Keywords

Kerr hypothesis X-ray reflection spectroscopy astrophysical black holes Cygnus X-1 general relativity

Cite

@article{arxiv.1904.08027,
  title  = {Testing the Kerr hypothesis using X-ray reflection spectroscopy with NuSTAR data of Cygnus X-1 in the soft state},
  author = {Honghui Liu and Askar B. Abdikamalov and Dimitry Ayzenberg and Cosimo Bambi and Thomas Dauser and Javier A. Garcia and Sourabh Nampalliwar},
  journal= {arXiv preprint arXiv:1904.08027},
  year   = {2019}
}

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15 pages, 8 figures. v2: refereed version

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

Abstract

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