Testing the Kerr metric with the iron line and the KRZ parametrization

Abstract

The spacetime geometry around astrophysical black holes is supposed to be well approximated by the Kerr metric, but deviations from the Kerr solution are predicted in a number of scenarios involving new physics. Broad iron K$\alpha$ lines are commonly observed in the X-ray spectrum of black holes and originate by X-ray fluorescence of the inner accretion disk. The profile of the iron line is sensitively affected by the spacetime geometry in the strong gravity region and can be used to test the Kerr black hole hypothesis. In this paper, we extend previous work in the literature. In particular: i) as test-metric, we employ the parametrization recently proposed by Konoplya, Rezzolla, and Zhidenko, which has a number of subtle advantages with respect to the existing approaches; ii) we perform simulations with specific X-ray missions, and we consider NuSTAR as a prototype of current observational facilities and eXTP as an example of the next generation of X-ray observatories. We find a significant difference between the constraining power of NuSTAR and eXTP. With NuSTAR, it is difficult or impossible to constrain deviations from the Kerr metric. With eXTP, in most cases we can obtain quite stringent constraints (modulo we have the correct astrophysical model).

arXiv comment1+13 pages, 7 figures. v2: refereed version

References in corpus (53)

• The Confrontation between General Relativity and Experiment
• Kerr black holes with scalar hair
• Can environmental effects spoil precision gravitational-wave astrophysics?
• Black Hole Spin in X-Ray Binaries: Observational Consequences
• Stationary Black Holes: Uniqueness and Beyond
• Measuring Black Hole Spin using X-ray Reflection Spectroscopy
• A Metric for Rapidly Spinning Black Holes Suitable for Strong-Field Tests of the No-Hair Theorem
• Dynamical Chern-Simons Modified Gravity I: Spinning Black Holes in the Slow-Rotation Approximation
• Black Hole Spin via Continuum Fitting and the Role of Spin in Powering Transient Jets
• Testing black hole candidates with electromagnetic radiation
• Kerr black holes with Proca hair
• General parametrization of axisymmetric black holes in metric theories of gravity
• Regular Black Hole Metric with Three Constants of Motion
• Charged black holes in effective string theory
• Black Hole's 1/N Hair
• Black Hole Based Tests of General Relativity
• Constraining the quadrupole moment of stellar-mass black-hole candidates with the continuum fitting method
• eXTP -- enhanced X-ray Timing and Polarimetry Mission
• Bumpy Black Holes in Alternate Theories of Gravity
• Rotating black holes in Einstein-Dilaton-Gauss-Bonnet gravity with finite coupling
• A code to compute the emission of thin accretion disks in non-Kerr space-times and test the nature of black hole candidates
• Testing the Kerr black hole hypothesis using X-ray reflection spectroscopy
• Testing the space-time geometry around black hole candidates with the analysis of the broad K$\alpha$ iron line
• X-ray reflection in accreting stellar-mass black hole systems
• Spacetime and orbits of bumpy black holes
• Testing the No-Hair Theorem with Observations in the Electromagnetic Spectrum. IV. Relativistically Broadened Iron Lines
• Profiles of emission lines generated by rings orbiting braneworld Kerr black holes
• Constraints on the spacetime geometry around 10 stellar-mass black hole candidates from the disk's thermal spectrum
• On generic parametrizations of spinning black-hole geometries
• Testing the no-hair theorem with the continuum-fitting and the iron line methods: a short review
• Possible observational windows for quantum effects from black holes
• Scalarized Hairy Black Holes
• Iron K$\alpha$ line of Kerr black holes with scalar hair
• K$\alpha$ iron line profile from accretion disks around regular and singular exotic compact objects
• Applicability of the Newman-Janis Algorithm to Black Hole Solutions of Modified Gravity Theories
• Thin accretion disk signatures of slowly rotating black holes in Hořava gravity
• Using iron line reverberation and spectroscopy to distinguish Kerr and non-Kerr black holes
• Note on the effect of a massive accretion disk in the measurements of black hole spins
• Black holes as antimatter factories
• Rapidly rotating black holes in dynamical Chern-Simons gravity: Decoupling limit solutions and breakdown
• Measuring the Kerr spin parameter of a non-Kerr compact object with the continuum-fitting and the iron line methods
• Testing the Bardeen metric with the black hole candidate in Cygnus X-1
• Newman-Janis method and rotating dilaton-axion black hole
• Testing the Kerr Nature of Black Hole Candidates using Iron Line Spectra in the CPR Framework
• The relativistic Iron K-alpha line from an accretion disc onto a static non-baryonic compact object
• Note on a new parametrization for testing the Kerr metric
• Radiative Model of Neutrino Mass with Neutrino Interacting MeV Dark Matter
• Spinning BTZ Black Hole versus Kerr Black Hole : A Closer Look
• Testing the Kerr black hole hypothesis: comparison between the gravitational wave and the iron line approaches
• A parametrization to test black hole candidates with the spectrum of thin disks
• Testing General Relativity's No-Hair Theorem with X-Ray Observations of Black Holes
• Testing the Kerr nature of black hole candidates using iron line reverberation mapping in the CPR framework
• X-ray Probes of Black Hole Accretion Disks for Testing the No-Hair Theorem

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