Testing the Kerr hypothesis using x-ray reflection spectroscopy with <i>NuSTAR</i> data of Cygnus X-1 in the soft state
H. LiuCenter for Field Theory and Particle Physics and Department of Physics, Fudan University, 200438 Shanghai, ChinaAskar B. AbdikamalovCenter for Field Theory and Particle Physics and Department of Physics, Fudan University, 200438 Shanghai, ChinaDimitry AyzenbergCenter for Field Theory and Particle Physics and Department of Physics, Fudan University, 200438 Shanghai, ChinaCosimo BambiCenter for Field Theory and Particle Physics and Department of Physics, Fudan University, 200438 Shanghai, ChinaThomas DauserRemeis Observatory and ECAP, Universität Erlangen-Nürnberg, 96049 Bamberg, GermanyJavier A. GarcíaCahill Center for Astronomy and Astrophysics, California Institute of Technology, Pasadena, California 91125, USASourabh NampalliwarTheoretical Astrophysics, Eberhard-Karls Universität Tübingen, 72076 Tübingen, Germany
2019en
ABI
Annotatsiya
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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