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Testing general relativity with supermassive black holes using X-ray reflection spectroscopy

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arxiv 1905.08012 v1 pith:MPJQRVGQ submitted 2019-05-20 gr-qc astro-ph.HE

Askar B. Abdikamalov , Dimitry Ayzenberg , Cosimo Bambi , Sourabh Nampalliwar , Ashutosh Tripathi , Jelen Wong , Yerong Xu , Jinli Yan
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Yunfeng Yan Yuchan Yang
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keywords blackgeneralholesrelativitymetricreflectionspacetimesupermassive
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In this paper, we review our current efforts to test General Relativity in the strong field regime by studying the reflection spectrum of supermassive black holes. So far we have analyzed 11 sources with observations of NuSTAR, Suzaku, Swift, and XMM-Newton. Our results are consistent with general relativity, according to which the spacetime metric around astrophysical black holes should be well approximated by the Kerr solution. We discuss the systematic uncertainties in our model and we present a preliminary study on the impact of some of them on the measurement of the spacetime metric.

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