Testing the Kerr nature of black hole candidates using iron line reverberation mapping in the CPR framework

Abstract

The iron K$\alpha$ line commonly observed in the X-ray spectrum of black hole candidates is produced by X-ray fluorescence of the inner accretion disk. This line can potentially be quite a powerful tool to probe the spacetime geometry around these objects and test the Kerr black hole hypothesis. In a previous paper, we studied the ability to constrain possible deviations from the Kerr solution from the standard time-integrated iron line spectrum within the Cardoso-Pani-Rico framework. In the present work, we expand on that study and consider iron line reverberation mapping in the CPR framework. That is, we consider the time-evolution of the iron line profile in response to fluctuations in the X-ray primary source. Our simulations clearly show that the time information in reverberation mapping can better constrain the background metric than the time-integrated approach, and this is true, notably, for the deformation parameter ${\epsilon }_3^r$, which is only weakly informed by a time-integrated observation.

10 pages, 6 figures. v2: refereed version

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• Testing the Kerr metric with the iron line and the KRZ parametrization
• Accretion disks around the Gibbons-Maeda-Garfinkle-Horowitz-Strominger charged black holes
• Quasi-periodic oscillations as a tool for testing the Kerr metric: A comparison with gravitational waves and iron line
• Thin accretion disks and charged rotating dilaton black holes
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• Accretion disk around the rotating Damour-Solodukhin wormhole
• Thin accretion disk signatures of scalarized black holes in Einstein-scalar-Gauss-Bonnet gravity
• Thin accretion disk around black hole in Einstein-Maxwell-scalar theory
• STU Black Holes and SgrA*
• Constraining the Kerr parameters via X-ray reflection spectroscopy
• Testing Gravity with Black Hole X-Ray Data
• Tests of General Relativity using black hole X-ray data
• Iron line reverberation mapping in Ghasemi-Nodehi-Bambi background